Pub Date : 2024-06-28DOI: 10.1016/j.jallcom.2024.175390
Xixi Ji, Yao Wan, Dan Xu, Xiaotong Pang, Yonggang Tong, Jingzhong Fang, Wei Xie, Yuanqiang Luo, Yaqi Ren, Yongle Hu
According to the escalating concern regarding the health hazards associated with electromagnetic radiation, the significance of absorbing materials underscores which could mitigate the healthy risks. While magnetic materials offer excellent absorption performance, their high density poses challenges to achieving optimal absorption efficiency. Conversely, carbon-based materials are known for their lightweight and versatile but face impedance matching issues. To address these obstacles, carbon/magnetic composite materials have been explored. However, their absorption performance has not fully met requirements due to weaker magnetic properties and increased density. Herein, we synthesized a porous carbon material embedded with magnetic FeNi/NiFeO and dielectric SiO nanoparticles (FeNi-NiFeO-SiO@PC) using carbonthermal method. By adjusting the ratio of polyvinylpyrrolidone to nitrates, the electromagnetic wave (EMW) absorption performance is adjusted. The FeNi-NiFeO-SiO@PC composites display remarkable EMW absorption properties, achieving a minimum reflection loss of −69.9 dB at a thin thickness of 1.495 mm and a maximum effective absorption bandwidth of 5.68 GHz, covering the range from 12.32 to 18.0 GHz at a thickness of 1.92 mm. This outstanding performance can be attributed to the favorable impedance matching and the three-dimensional porous structure, which facilitates a 3D transmission network for multiple reflections. Additionally, the presence of FeNi, NiFeO, and SiO nanoparticles enhances magnetic loss, conductive loss, interface polarization, and dipolar polarization, leading to excellent ab. Hence, this work offers insights into the composition design of high-performance absorbing materials.
电磁辐射对健康的危害日益受到关注，因此吸收材料的重要性日益凸显，它可以降低健康风险。虽然磁性材料具有出色的吸收性能，但其高密度给实现最佳吸收效率带来了挑战。与此相反，碳基材料以重量轻、用途广而著称，但却面临阻抗匹配问题。为了解决这些障碍，人们对碳/磁复合材料进行了探索。然而，由于磁性较弱和密度增加，它们的吸收性能还不能完全满足要求。在此，我们采用碳热法合成了一种嵌入磁性 FeNi/NiFeO 和介电 SiO 纳米颗粒（FeNi-NiFeO-SiO@PC）的多孔碳材料。通过调整聚乙烯吡咯烷酮与硝酸盐的比例，可以调整电磁波（EMW）的吸收性能。FeNi-NiFeO-SiO@PC复合材料显示出卓越的电磁波吸收性能，在厚度为1.495毫米的薄层中，最小反射损耗为-69.9分贝，最大有效吸收带宽为5.68千兆赫，在厚度为1.92毫米的薄层中，有效吸收带宽覆盖了12.32至18.0千兆赫的范围。这种出色的性能归功于良好的阻抗匹配和三维多孔结构，这种结构有利于形成三维传输网络，实现多重反射。此外，FeNi、NiFeO 和 SiO 纳米粒子的存在增强了磁损耗、传导损耗、界面极化和偶极极化，从而实现了出色的 ab 性能。因此，这项研究为高性能吸波材料的成分设计提供了启示。
{"title":"Porous carbon composite nanosheets loaded with magnetic FeNi/NiFe2O4 and dielectric SiO2 nanoparticles for adjustable microwave absorption","authors":"Xixi Ji, Yao Wan, Dan Xu, Xiaotong Pang, Yonggang Tong, Jingzhong Fang, Wei Xie, Yuanqiang Luo, Yaqi Ren, Yongle Hu","doi":"10.1016/j.jallcom.2024.175390","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175390","url":null,"abstract":"According to the escalating concern regarding the health hazards associated with electromagnetic radiation, the significance of absorbing materials underscores which could mitigate the healthy risks. While magnetic materials offer excellent absorption performance, their high density poses challenges to achieving optimal absorption efficiency. Conversely, carbon-based materials are known for their lightweight and versatile but face impedance matching issues. To address these obstacles, carbon/magnetic composite materials have been explored. However, their absorption performance has not fully met requirements due to weaker magnetic properties and increased density. Herein, we synthesized a porous carbon material embedded with magnetic FeNi/NiFeO and dielectric SiO nanoparticles (FeNi-NiFeO-SiO@PC) using carbonthermal method. By adjusting the ratio of polyvinylpyrrolidone to nitrates, the electromagnetic wave (EMW) absorption performance is adjusted. The FeNi-NiFeO-SiO@PC composites display remarkable EMW absorption properties, achieving a minimum reflection loss of −69.9 dB at a thin thickness of 1.495 mm and a maximum effective absorption bandwidth of 5.68 GHz, covering the range from 12.32 to 18.0 GHz at a thickness of 1.92 mm. This outstanding performance can be attributed to the favorable impedance matching and the three-dimensional porous structure, which facilitates a 3D transmission network for multiple reflections. Additionally, the presence of FeNi, NiFeO, and SiO nanoparticles enhances magnetic loss, conductive loss, interface polarization, and dipolar polarization, leading to excellent ab. Hence, this work offers insights into the composition design of high-performance absorbing materials.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141463890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-28DOI: 10.1016/j.jallcom.2024.175396
Kai Liu, Yimurang Hamiti, Sulong Wang, Ainizier Yalikun, Jiaheng Du, Ke Duan, Jinhui Liu, Yanshi Liu, Aihemaitijiang Yusufu
Bone defects caused by trauma, fracture-related infection, congenital malformations, and tumor resection remain significant challenges to human health. Biodegradable Zn-based alloys have been acknowledged for their outstanding comprehensive properties in addressing bone defects, offering adequate mechanical support, mild degradation rate, and satisfactory biosafety. In this study, Zn–0.8Li-0.1Ca alloy was fabricated and comprehensively evaluated both and for their properties. The Zn-0.8Li-0.1Ca alloy demonstrated an ultimate tensile strength of 251.07 ± 9.59 MPa and an elongation of 18.89 ± 1.26 %. Electrochemical and degradation tests showed that there was a mild degradation rate (21.94 ± 2.26 μm/year) and uniform degradation behavior in the Zn-0.8Li-0.1Ca alloy. Real-time PCR analysis revealed that the Zn-0.8Li-0.1Ca alloy effectively upregulated the expression levels of osteogenesis-related genes (ALP, COL-1, OCN, and RUNX-2). Micro-CT and histological evaluations demonstrated that bone regeneration within the Zn-0.8Li-0.1Ca alloy scaffold was significantly superior to that of pure Ti in repairing rat femoral condyle defects. Therefore, the biodegradable Zn-0.8Li-0.1Ca ternary alloy displayed satisfactory mechanical properties, degradation behavior, biocompatibility, and osteogenic activity, positioning it as a promising candidate for bone repair treatment.
{"title":"Biocompatibility and osteoinductivity of biodegradable Zn-Li-Ca ternary alloys for bone regeneration: In vitro and in vivo studies","authors":"Kai Liu, Yimurang Hamiti, Sulong Wang, Ainizier Yalikun, Jiaheng Du, Ke Duan, Jinhui Liu, Yanshi Liu, Aihemaitijiang Yusufu","doi":"10.1016/j.jallcom.2024.175396","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175396","url":null,"abstract":"Bone defects caused by trauma, fracture-related infection, congenital malformations, and tumor resection remain significant challenges to human health. Biodegradable Zn-based alloys have been acknowledged for their outstanding comprehensive properties in addressing bone defects, offering adequate mechanical support, mild degradation rate, and satisfactory biosafety. In this study, Zn–0.8Li-0.1Ca alloy was fabricated and comprehensively evaluated both and for their properties. The Zn-0.8Li-0.1Ca alloy demonstrated an ultimate tensile strength of 251.07 ± 9.59 MPa and an elongation of 18.89 ± 1.26 %. Electrochemical and degradation tests showed that there was a mild degradation rate (21.94 ± 2.26 μm/year) and uniform degradation behavior in the Zn-0.8Li-0.1Ca alloy. Real-time PCR analysis revealed that the Zn-0.8Li-0.1Ca alloy effectively upregulated the expression levels of osteogenesis-related genes (ALP, COL-1, OCN, and RUNX-2). Micro-CT and histological evaluations demonstrated that bone regeneration within the Zn-0.8Li-0.1Ca alloy scaffold was significantly superior to that of pure Ti in repairing rat femoral condyle defects. Therefore, the biodegradable Zn-0.8Li-0.1Ca ternary alloy displayed satisfactory mechanical properties, degradation behavior, biocompatibility, and osteogenic activity, positioning it as a promising candidate for bone repair treatment.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141463862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-28DOI: 10.1016/j.jallcom.2024.175399
Zuhuan Lu, Yukun Wang, Jing Zhang, Xujianeng Du, Wenhong Sun
In perovskite detectors that utilize SnO₂ as an electron transport layer (ETL), the preparation of SnO₂ films using the solution method results in a significant number of defects. Additionally, the presence of nano-aggregates in the aqueous solution of untreated SnO₂ colloids leads to surface unevenness in SnO₂ films prepared using the spin-coating method, which can affect the growth and crystallization of perovskite. Defects and surface unevenness in SnO₂ films affect the performance of perovskite detectors. To further optimize the performance of perovskite detectors, SnO₂ incorporating poly (ethylene glycol) bis (carboxymethyl) ether (PBE) was developed, employing the polymer as a modifier. The results of the study showed that the incorporation of PBE had two effects: 1) the ether oxygen within the PBE forms a coordination bond with SnO₂, thereby reducing oxygen vacancies, and 2) reducing nano-aggregation of SnO₂ colloidal aqueous solutions, obtaining more uniform SnO₂ films, and promoting the growth and crystallization of perovskite. Ultimately, the performance of the optimized device was improved. The external quantum efficiency (EQE) improved from 84.82 % to 89.29 %, the dark current density decreased from 3.27 × 10⁹ A cm² to 1.03 × 10¹⁰ A cm², the linear dynamic range (LDR) increased from 88.5 to 118.3 dB, and the stability was enhanced. The device maintained 64.9 % of its original efficiency after being stored for 23 days at 25 °C and 20–30 % humidity.
{"title":"Exploiting coordination between poly (ethylene glycol) bis (carboxymethyl) ether and SnO2 for high-performance perovskite photodetectors","authors":"Zuhuan Lu, Yukun Wang, Jing Zhang, Xujianeng Du, Wenhong Sun","doi":"10.1016/j.jallcom.2024.175399","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175399","url":null,"abstract":"In perovskite detectors that utilize SnO₂ as an electron transport layer (ETL), the preparation of SnO₂ films using the solution method results in a significant number of defects. Additionally, the presence of nano-aggregates in the aqueous solution of untreated SnO₂ colloids leads to surface unevenness in SnO₂ films prepared using the spin-coating method, which can affect the growth and crystallization of perovskite. Defects and surface unevenness in SnO₂ films affect the performance of perovskite detectors. To further optimize the performance of perovskite detectors, SnO₂ incorporating poly (ethylene glycol) bis (carboxymethyl) ether (PBE) was developed, employing the polymer as a modifier. The results of the study showed that the incorporation of PBE had two effects: 1) the ether oxygen within the PBE forms a coordination bond with SnO₂, thereby reducing oxygen vacancies, and 2) reducing nano-aggregation of SnO₂ colloidal aqueous solutions, obtaining more uniform SnO₂ films, and promoting the growth and crystallization of perovskite. Ultimately, the performance of the optimized device was improved. The external quantum efficiency (EQE) improved from 84.82 % to 89.29 %, the dark current density decreased from 3.27 × 10⁹ A cm² to 1.03 × 10¹⁰ A cm², the linear dynamic range (LDR) increased from 88.5 to 118.3 dB, and the stability was enhanced. The device maintained 64.9 % of its original efficiency after being stored for 23 days at 25 °C and 20–30 % humidity.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141463790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-27DOI: 10.1016/j.jallcom.2024.175376
Junjie Dai, Balaji Murugesan, Weidi Lin, Chao Wang, Suyuan Zhang, Jun Wu, Darwin B. Putungan, Yurong Cai
This study presents the design and fabrication of multi-channel self-supported anode materials CoS/SnS@MCNFs, through the electrospinning technique. The high compatibility of CoS and SnS at the interface enables the synthesis of a more complete heterostructure within the material, enhancing the electrochemical reaction process through rational heterostructure design. Additionally, the incorporation of high theoretical capacity SnS improves sodium storage performance. The design of multi-channel carbon nanofibers (MCNFs) effectively addresses challenges such as material volume expansion and metal particle aggregation during cycling by providing large specific surface areas and enabling carbon encapsulation. The resulting pore structure and heterostructure formation, coupled with introduction of more defects, enhance the availability of Na active sites for electrochemically reversible processes. As expected, CoS/SnS@MCNFs exhibit remarkable initial coulombic efficiency (ICE = 92.6 %) and demonstrate stable long-term cycling performance (222.5 mA h g at 2 A g after 400 cycles) for sodium storage, with only a 0.18 % decay rate per cycle. These findings suggest promising application for the electrode material in sustained high-current discharges and long-endurance performance.
本研究通过电纺丝技术设计并制备了多通道自支撑阳极材料 CoS/SnS@MCNFs。CoS 和 SnS 在界面上的高度相容性使材料内部合成了更完整的异质结构，通过合理的异质结构设计增强了电化学反应过程。此外，高理论容量 SnS 的加入提高了钠的存储性能。多通道碳纳米纤维（MCNF）的设计通过提供大的比表面积和实现碳封装，有效地解决了材料体积膨胀和循环过程中金属颗粒聚集等难题。由此形成的孔隙结构和异质结构，加上更多缺陷的引入，提高了电化学可逆过程中 Na 活性位点的可用性。正如预期的那样，CoS/SnS@MCNFs 在储钠方面表现出卓越的初始库仑效率（ICE = 92.6 %）和稳定的长期循环性能（400 次循环后在 2 A g 条件下为 222.5 mA h g），每个循环的衰减率仅为 0.18 %。这些研究结果表明，这种电极材料在持续大电流放电和长期耐久性能方面具有广阔的应用前景。
{"title":"Construction of Co9S8/SnS heterostructures encapsulated in multi-channel carbon nanofibers as long-term stable anodes for sodium-ion batteries","authors":"Junjie Dai, Balaji Murugesan, Weidi Lin, Chao Wang, Suyuan Zhang, Jun Wu, Darwin B. Putungan, Yurong Cai","doi":"10.1016/j.jallcom.2024.175376","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175376","url":null,"abstract":"This study presents the design and fabrication of multi-channel self-supported anode materials CoS/SnS@MCNFs, through the electrospinning technique. The high compatibility of CoS and SnS at the interface enables the synthesis of a more complete heterostructure within the material, enhancing the electrochemical reaction process through rational heterostructure design. Additionally, the incorporation of high theoretical capacity SnS improves sodium storage performance. The design of multi-channel carbon nanofibers (MCNFs) effectively addresses challenges such as material volume expansion and metal particle aggregation during cycling by providing large specific surface areas and enabling carbon encapsulation. The resulting pore structure and heterostructure formation, coupled with introduction of more defects, enhance the availability of Na active sites for electrochemically reversible processes. As expected, CoS/SnS@MCNFs exhibit remarkable initial coulombic efficiency (ICE = 92.6 %) and demonstrate stable long-term cycling performance (222.5 mA h g at 2 A g after 400 cycles) for sodium storage, with only a 0.18 % decay rate per cycle. These findings suggest promising application for the electrode material in sustained high-current discharges and long-endurance performance.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141462703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-27DOI: 10.1016/j.jallcom.2024.175373
Zheng Yan, Yang Liu, Haiting Zhao, Xin Ke
With regard to the catalysts for NH selective catalytic reduction (NH-SCR), the acid sites distribution can affect the adsorption of reactants and formation of intermediates, thus determining the reaction routines. In this work, a representative acidic component, monoclinic-WO (m-WO), was used to probe the combination strategy of experimental and theoretical research, aiming at systematic understanding on the full-process mechanisms. Macro-scale characterizations, Temperature Programmed Desorption (TPD) and Temperature Programmed Reduction (TPR), are associated with the Density Functional Theory (DFT) calculations, by which W ion (Lewis acid site) is affirmed as the active sites. By comparing the energy barriers of possible pathways with DFT calculations, we identify that NHNO and NHNOH are responsible active intermediates. Both Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) pathways may take place on acid sites and the former on Lewis acid site is optimal, which agrees well the in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) analysis. This study offers a reasonable prototype for precisely examining the correlation between the catalyst and mechanisms of NH-SCR catalysts.
{"title":"Unraveling the significance of acid sites in determining NH3-SCR mechanisms over WO3 catalyst: A combined experimental and computational study","authors":"Zheng Yan, Yang Liu, Haiting Zhao, Xin Ke","doi":"10.1016/j.jallcom.2024.175373","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175373","url":null,"abstract":"With regard to the catalysts for NH selective catalytic reduction (NH-SCR), the acid sites distribution can affect the adsorption of reactants and formation of intermediates, thus determining the reaction routines. In this work, a representative acidic component, monoclinic-WO (m-WO), was used to probe the combination strategy of experimental and theoretical research, aiming at systematic understanding on the full-process mechanisms. Macro-scale characterizations, Temperature Programmed Desorption (TPD) and Temperature Programmed Reduction (TPR), are associated with the Density Functional Theory (DFT) calculations, by which W ion (Lewis acid site) is affirmed as the active sites. By comparing the energy barriers of possible pathways with DFT calculations, we identify that NHNO and NHNOH are responsible active intermediates. Both Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) pathways may take place on acid sites and the former on Lewis acid site is optimal, which agrees well the in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) analysis. This study offers a reasonable prototype for precisely examining the correlation between the catalyst and mechanisms of NH-SCR catalysts.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141462824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, the effect of Al mole ratio on phase evolution, damping capacity and mechanical properties of the AlCrFeNi (indicated by Al, = 0.3, 0.4, 0.5 and 0.7) medium-entropy alloys (MEAs) was investigated. The results show that the structure of the Al MEAs changes from the face-centered cubic (FCC) phase dominated by the Al alloy to the body-centered cubic (BCC) phase dominated by the Al alloy. As the volume fraction of the BCC phase increases the corresponding grain size of the alloys decreases and then increases, which increases the ferromagnetic properties and decreases interfacial area in the Al alloys. The high damping capacity of Al and Al alloys is corresponding to 0.05545, and 0.05044, respectively, under the synergistic effects of ferromagnetic damping and interfacial damping. The special honeycomb-like morphology of FCC phase distributed in the BCC matrix gives the Al alloy the highest damping capacity and yield strength.
本文研究了 Al 摩尔比对 AlCrFeNi（用 Al = 0.3、0.4、0.5 和 0.7 表示）中熵合金（MEAs）的相演化、阻尼能力和机械性能的影响。结果表明，Al 中熵合金的结构从以 Al 合金为主的面心立方（FCC）相变为以 Al 合金为主的体心立方（BCC）相。随着 BCC 相体积分数的增加，合金的相应晶粒尺寸先减小后增大，从而增加了铁磁性能并减小了铝合金的界面面积。在铁磁阻尼和界面阻尼的协同作用下，Al 和 Al 合金的高阻尼容量分别为 0.05545 和 0.05044。分布在 BCC 基体中的 FCC 相的特殊蜂窝状形态使 Al 合金具有最高的阻尼容量和屈服强度。
{"title":"Peculiar microstructure with high damping capacity for Al0.5CrFe2Ni medium-entropy alloy","authors":"Hongding Wang, Wei Zhang, Peng Gao, Qingchun Xiang, Yingdong Qu, Yinglei Ren, Bo Yu, Keqiang Qiu","doi":"10.1016/j.jallcom.2024.175378","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175378","url":null,"abstract":"In this paper, the effect of Al mole ratio on phase evolution, damping capacity and mechanical properties of the AlCrFeNi (indicated by Al, = 0.3, 0.4, 0.5 and 0.7) medium-entropy alloys (MEAs) was investigated. The results show that the structure of the Al MEAs changes from the face-centered cubic (FCC) phase dominated by the Al alloy to the body-centered cubic (BCC) phase dominated by the Al alloy. As the volume fraction of the BCC phase increases the corresponding grain size of the alloys decreases and then increases, which increases the ferromagnetic properties and decreases interfacial area in the Al alloys. The high damping capacity of Al and Al alloys is corresponding to 0.05545, and 0.05044, respectively, under the synergistic effects of ferromagnetic damping and interfacial damping. The special honeycomb-like morphology of FCC phase distributed in the BCC matrix gives the Al alloy the highest damping capacity and yield strength.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141462701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The quest for sustainable and efficient energy conversion technologies has intensified research into advanced materials for electrochemical reactions, such as the oxygen evolution reaction (OER) and methanol oxidation reaction (MOR). Transition metal oxides have emerged as promising catalysts due to their abundance, low cost, and adjustable electronic properties. Among these, Nickel (Ni)-based compounds are particularly noteworthy for their catalytic activity and stability. This research paper explores the crucial impact of Nickel (Ni) substitution and introducing porosity on the valence states of metal ions and their mass transport in the context of OER and MOR. In this study, we present a step-by-step surfactant (Brij 58) assisted synthesis approach for the preparation of mesoporous CoO and NiCoO. The synthesised material has been physiochemically characterised by Fourier transform Infrared Spectroscopy (FTIR), Scanning electron microscopic/Energy-dispersive X-ray spectroscopy (SEM/EDS) and High-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), and inductively coupled plasma mass spectrometry (ICP-MS) analyses. Additionally, the impact of these alterations on electrocatalytic activity, reaction kinetics, and electrochemical stability during OER/MOR has been explored by Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), Tafel, Electrochemical Impedance Spectroscopy (EIS) and chronoamperometric experiments. Mesoporous NiCoO exhibits exceptional electrocatalytic performance with current densities of 46.8 mA/cm for OER and 214.5 mA/cm for MOR at 550 mV. By shedding light on the intricate interplay between metal substitution, porosity, and valence states, this research aims to provide valuable insights for the evolution of enhanced cobaltite electrocatalysts for sustainable water splitting and MOR.
对可持续高效能源转换技术的追求，加强了对用于电化学反应（如氧进化反应和甲醇氧化反应）的先进材料的研究。过渡金属氧化物因其丰富、低成本和可调节的电子特性而成为前景广阔的催化剂。其中，镍（Ni）基化合物的催化活性和稳定性尤为突出。本研究论文以 OER 和 MOR 为背景，探讨了镍（Ni）替代和引入孔隙率对金属离子价态及其质量传输的重要影响。在本研究中，我们介绍了一种逐步合成介孔 CoO 和 NiCoO 的表面活性剂（Brij 58）辅助方法。通过傅立叶变换红外光谱 (FTIR)、扫描电子显微镜/能量色散 X 射线光谱 (SEM/EDS) 和高分辨率透射电子显微镜 (HR-TEM)、X 射线衍射 (XRD) 以及电感耦合等离子体质谱 (ICP-MS) 分析，对合成材料进行了物理化学表征。此外，还通过循环伏安法 (CV)、线性扫描伏安法 (LSV)、塔菲尔法 (Tafel)、电化学阻抗谱法 (EIS) 和计时电流计实验探讨了这些变化对 OER/MOR 过程中的电催化活性、反应动力学和电化学稳定性的影响。介孔钴酸镍表现出卓越的电催化性能，在 550 mV 电压下，OER 和 MOR 的电流密度分别为 46.8 mA/cm 和 214.5 mA/cm。通过阐明金属替代、孔隙率和价态之间错综复杂的相互作用，本研究旨在为可持续水分离和 MOR 的增强型钴酸盐电催化剂的发展提供有价值的见解。
{"title":"Synergetic effect of Ni substitution and induced porosity: Enhancing the electrocatalytic performance of cobaltite towards OER and MOR in alkaline medium","authors":"Prakhar Mishra, Reena Parihar, Yamini Singh, Narendra Kumar Singh","doi":"10.1016/j.jallcom.2024.175375","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175375","url":null,"abstract":"The quest for sustainable and efficient energy conversion technologies has intensified research into advanced materials for electrochemical reactions, such as the oxygen evolution reaction (OER) and methanol oxidation reaction (MOR). Transition metal oxides have emerged as promising catalysts due to their abundance, low cost, and adjustable electronic properties. Among these, Nickel (Ni)-based compounds are particularly noteworthy for their catalytic activity and stability. This research paper explores the crucial impact of Nickel (Ni) substitution and introducing porosity on the valence states of metal ions and their mass transport in the context of OER and MOR. In this study, we present a step-by-step surfactant (Brij 58) assisted synthesis approach for the preparation of mesoporous CoO and NiCoO. The synthesised material has been physiochemically characterised by Fourier transform Infrared Spectroscopy (FTIR), Scanning electron microscopic/Energy-dispersive X-ray spectroscopy (SEM/EDS) and High-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), and inductively coupled plasma mass spectrometry (ICP-MS) analyses. Additionally, the impact of these alterations on electrocatalytic activity, reaction kinetics, and electrochemical stability during OER/MOR has been explored by Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), Tafel, Electrochemical Impedance Spectroscopy (EIS) and chronoamperometric experiments. Mesoporous NiCoO exhibits exceptional electrocatalytic performance with current densities of 46.8 mA/cm for OER and 214.5 mA/cm for MOR at 550 mV. By shedding light on the intricate interplay between metal substitution, porosity, and valence states, this research aims to provide valuable insights for the evolution of enhanced cobaltite electrocatalysts for sustainable water splitting and MOR.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141463179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hydrogen production from electrolytic seawater, as a renewable energy production method, not only conserves freshwater resources, but also helps to reduce dependence on fossil fuels and promote the transition of the energy mix to a cleaner and more sustainable direction. However, seawater cracking is challenged by the kinetically slow oxygen evolution reaction (OER), the competing chloride evolution reaction (CER) and impurities/precipitates, making it more difficult than pure water electrolysis. To date, much effort has been put into developing efficient catalysts for the OER reaction in order to accelerate research into seawater electrolysis for hydrogen production. Due to its excellent performance in pure water electrolysis, the use of NiFe layered double hydroxide (NiFe-LDH) for seawater oxidation has been widely reported in recent years. Therefore, this paper reviews the recent progress of NiFe-LDH for seawater oxidation in the last five years. Firstly, the mechanisms of seawater oxidation and the challenges of seawater electrolysis are introduced. Secondly, the crystal structure and synthesis methods of NiFe-LDH are briefly described. Then, various modification strategies to improve its seawater oxidation performance are categorized and discussed, and finally, we propose some future directions for the development of NiFe-LDH catalysts for seawater oxidation.
电解海水制氢作为一种可再生能源生产方法，不仅可以保护淡水资源，还有助于减少对化石燃料的依赖，促进能源结构向更清洁、更可持续的方向转变。然而，海水裂解面临着动力学上缓慢的氧进化反应（OER）、与之竞争的氯进化反应（CER）和杂质/沉淀物的挑战，因此比纯水电解更为困难。迄今为止，为了加快海水电解制氢的研究，人们一直致力于开发高效的 OER 反应催化剂。由于镍铁合金层状双氢氧化物（NiFe-LDH）在纯水电解中的优异性能，近年来将其用于海水氧化反应的研究被广泛报道。因此，本文回顾了近五年来 NiFe-LDH 用于海水氧化的最新进展。首先，介绍了海水氧化机理和海水电解面临的挑战。其次，简要介绍了 NiFe-LDH 的晶体结构和合成方法。然后，分类讨论了提高其海水氧化性能的各种改性策略，最后提出了海水氧化用 NiFe-LDH 催化剂的未来发展方向。
{"title":"Recent advances in NiFe layered double hydroxide electrocatalysts for seawater oxidation","authors":"Hongxin Wang, Haibin Wang, Zhaobo Wang, Jiangyuan Qiu, Biao Wang, Rui Guo, Junhua You, Xuefei Lei, Xuanwen Liu","doi":"10.1016/j.jallcom.2024.175368","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175368","url":null,"abstract":"Hydrogen production from electrolytic seawater, as a renewable energy production method, not only conserves freshwater resources, but also helps to reduce dependence on fossil fuels and promote the transition of the energy mix to a cleaner and more sustainable direction. However, seawater cracking is challenged by the kinetically slow oxygen evolution reaction (OER), the competing chloride evolution reaction (CER) and impurities/precipitates, making it more difficult than pure water electrolysis. To date, much effort has been put into developing efficient catalysts for the OER reaction in order to accelerate research into seawater electrolysis for hydrogen production. Due to its excellent performance in pure water electrolysis, the use of NiFe layered double hydroxide (NiFe-LDH) for seawater oxidation has been widely reported in recent years. Therefore, this paper reviews the recent progress of NiFe-LDH for seawater oxidation in the last five years. Firstly, the mechanisms of seawater oxidation and the challenges of seawater electrolysis are introduced. Secondly, the crystal structure and synthesis methods of NiFe-LDH are briefly described. Then, various modification strategies to improve its seawater oxidation performance are categorized and discussed, and finally, we propose some future directions for the development of NiFe-LDH catalysts for seawater oxidation.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141462704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Titanium is an excellent structural and functional material. At present, the production of titanium has long process cycle, high energy consumption, serious pollution and other characteristics, so the development of low-cost titanium production methods has extremely far-reaching significance. In this work, the electrochemical reduction process of Ti(IV) and Ti(II) in the CaF-CaO melt were investigated by cyclic voltammetry and square wave voltammetry measurements at 1740 K, respectively. In the CaF-CaO-5 wt% TiO melt, Ti(IV) ions were reduced to Ti by one step. One measure was taken to lower the valence state of Ti ions: Ti(IV) ions in the melt was changed to Ti(II) by adding Ti. Ti(IV) ions were reduced in two steps: in the CaF-CaO-5 wt% TiO-Ti melt, Ti(IV) → Ti(II) and Ti(II) → Ti, respectively, and in the CaF-CaO-5 wt% TiO, the Ti(II) ions were reduced in a single step: Ti(II) → Ti. It was found that both migration and mass transfer affected the reduction processes. In contrast to the Ti(IV) reduction to Ti process, the Ti(II) reduction to Ti process showed a higher diffusion rate. Electrolytes and electrodes were analyzed after titanium electrodeposition by XRD. It was found that there were no metal titanium was detected in the electrolyte placed close to the cathode after electrodeposition. It believed that the formed metallic Ti reacted with dissolved O in the melt to form TiO. The reduction process of Ti(IV) on the iron electrode was investigated, the metal Ti was reduced by alloying process, the oxidation of Ti was hindered, there was a dense structure layer of CaTiO outside the reduced metal Ti that prevented the ions transfer and affected the Ti(IV) ions migration process, which might be the main factor that the Ti(IV) reduction process was controlled by migration. The lower valence state of Ti in the melt promoted the formation of CaTiO, which increased the ion migration rate and decreased the mass transfer rate. It was suggested that titanium or titanium alloys may be prepared by reducing the valence of Ti(IV) in minerals and altering the melt composition. It is feasible to prepare titanium and titanium alloys by MOE short process using ore as raw material.
钛是一种优良的结构材料和功能材料。目前，钛的生产具有工艺周期长、能耗高、污染严重等特点，因此开发低成本的钛生产方法具有极其深远的意义。本研究采用循环伏安法和方波伏安法，在 1740 K 下分别研究了 Ti(IV) 和 Ti(II) 在 CaF-CaO 熔体中的电化学还原过程。在 CaF-CaO-5 wt% TiO 熔体中，Ti(IV) 离子一步还原成 Ti。其中一个措施是降低 Ti 离子的价态：通过添加 Ti，将熔体中的 Ti(IV) 离子转变为 Ti(II)。Ti(IV) 离子分两步被还原：在 CaF-CaO-5 wt% TiO-Ti 熔体中，Ti(IV) → Ti(II) 和 Ti(II) → Ti 分别被还原；而在 CaF-CaO-5 wt% TiO 中，Ti(II) 离子被一步还原：Ti(II) → Ti。研究发现，迁移和传质都会影响还原过程。与 Ti(IV) 还原成 Ti 的过程相比，Ti(II) 还原成 Ti 的过程显示出更高的扩散率。通过 XRD 分析了钛电沉积后的电解质和电极。结果发现，在电沉积后靠近阴极的电解液中没有检测到金属钛。这表明形成的金属钛与熔体中溶解的 O 反应生成了 TiO。研究了 Ti（IV）在铁电极上的还原过程，金属 Ti 在合金化过程中被还原，Ti 的氧化受阻，在被还原的金属 Ti 外有一层致密的 CaTiO 结构层，阻止了离子的转移，影响了 Ti（IV）离子的迁移过程，这可能是 Ti（IV）还原过程受迁移控制的主要因素。熔体中钛的价态较低，促进了 CaTiO 的形成，从而增加了离子迁移率，降低了传质速率。研究表明，可以通过降低矿物中 Ti（IV）的价态并改变熔体成分来制备钛或钛合金。以矿石为原料，采用 MOE 短流程制备钛和钛合金是可行的。
{"title":"Electrochemical reduction processes and extraction of titanium with different valence states in molten CaO-CaF2 slags","authors":"Liqi Zhang, Xu Zhang, Bowen Huang, Yusheng Yang, Zengwu Zhao","doi":"10.1016/j.jallcom.2024.175379","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175379","url":null,"abstract":"Titanium is an excellent structural and functional material. At present, the production of titanium has long process cycle, high energy consumption, serious pollution and other characteristics, so the development of low-cost titanium production methods has extremely far-reaching significance. In this work, the electrochemical reduction process of Ti(IV) and Ti(II) in the CaF-CaO melt were investigated by cyclic voltammetry and square wave voltammetry measurements at 1740 K, respectively. In the CaF-CaO-5 wt% TiO melt, Ti(IV) ions were reduced to Ti by one step. One measure was taken to lower the valence state of Ti ions: Ti(IV) ions in the melt was changed to Ti(II) by adding Ti. Ti(IV) ions were reduced in two steps: in the CaF-CaO-5 wt% TiO-Ti melt, Ti(IV) → Ti(II) and Ti(II) → Ti, respectively, and in the CaF-CaO-5 wt% TiO, the Ti(II) ions were reduced in a single step: Ti(II) → Ti. It was found that both migration and mass transfer affected the reduction processes. In contrast to the Ti(IV) reduction to Ti process, the Ti(II) reduction to Ti process showed a higher diffusion rate. Electrolytes and electrodes were analyzed after titanium electrodeposition by XRD. It was found that there were no metal titanium was detected in the electrolyte placed close to the cathode after electrodeposition. It believed that the formed metallic Ti reacted with dissolved O in the melt to form TiO. The reduction process of Ti(IV) on the iron electrode was investigated, the metal Ti was reduced by alloying process, the oxidation of Ti was hindered, there was a dense structure layer of CaTiO outside the reduced metal Ti that prevented the ions transfer and affected the Ti(IV) ions migration process, which might be the main factor that the Ti(IV) reduction process was controlled by migration. The lower valence state of Ti in the melt promoted the formation of CaTiO, which increased the ion migration rate and decreased the mass transfer rate. It was suggested that titanium or titanium alloys may be prepared by reducing the valence of Ti(IV) in minerals and altering the melt composition. It is feasible to prepare titanium and titanium alloys by MOE short process using ore as raw material.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141463453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-27DOI: 10.1016/j.jallcom.2024.175383
Yu Zhang, Weimeng Chi, Zhuoxun Yin, Xinzhi Ma, Yang Zhou, Wanqiang Liu, Jinlong Li
Urea oxidation reaction (UOR) is considered an ideal water splitting reaction with the potential to replace oxygen evolution reaction (OER), as it lowers the anodic potential and utilizes urea as a renewable and abundant resource. However, creating stable, effective bifunctional catalysts is still challenging. In this work, we report a novel bifunctional catalyst of core-shell structure Ni-500 Nano-particle. The carbon coating not only offers numerous active sites and facilitates rapid charge transfer but also shields the nickel core from corrosion. Moreover, By replenishing the urea concentration, the current density can be recovered and sustained for 50 h with only an 8 % decrease. It is significantly less than pure water electrolysis that the urea-assisted water electrolyzer with Ni-500 as both cathode and anode achieves cell-voltage of 1.55 V at 100 mA cm. This work demonstrates the potential of Ni-500 as a inexpensive and effective catalyst for urea-based hydrogen production, and offers new perspectives into the design and optimization for core-shell structure electrocatalyst.
尿素氧化反应（UOR）被认为是一种理想的水分离反应，有可能取代氧进化反应（OER），因为它能降低阳极电位，并利用尿素这种可再生的丰富资源。然而，创造稳定、有效的双功能催化剂仍具有挑战性。在这项工作中，我们报告了一种新型核壳结构 Ni-500 纳米粒子双功能催化剂。碳涂层不仅提供了大量活性位点，促进了电荷的快速转移，还保护了镍核免受腐蚀。此外，通过补充尿素浓度，电流密度可恢复并维持 50 小时，且仅下降 8%。与纯水电解相比，以 Ni-500 为阴极和阳极的尿素辅助水电解槽在 100 mA cm 条件下可获得 1.55 V 的电池电压。这项工作证明了 Ni-500 作为一种廉价而有效的催化剂用于尿素制氢的潜力，并为核壳结构电催化剂的设计和优化提供了新的视角。
{"title":"Nickel metal particles encapsulated in carbon shells as efficient bifunctional electrocatalysts for urea-assisted hydrogen production","authors":"Yu Zhang, Weimeng Chi, Zhuoxun Yin, Xinzhi Ma, Yang Zhou, Wanqiang Liu, Jinlong Li","doi":"10.1016/j.jallcom.2024.175383","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175383","url":null,"abstract":"Urea oxidation reaction (UOR) is considered an ideal water splitting reaction with the potential to replace oxygen evolution reaction (OER), as it lowers the anodic potential and utilizes urea as a renewable and abundant resource. However, creating stable, effective bifunctional catalysts is still challenging. In this work, we report a novel bifunctional catalyst of core-shell structure Ni-500 Nano-particle. The carbon coating not only offers numerous active sites and facilitates rapid charge transfer but also shields the nickel core from corrosion. Moreover, By replenishing the urea concentration, the current density can be recovered and sustained for 50 h with only an 8 % decrease. It is significantly less than pure water electrolysis that the urea-assisted water electrolyzer with Ni-500 as both cathode and anode achieves cell-voltage of 1.55 V at 100 mA cm. This work demonstrates the potential of Ni-500 as a inexpensive and effective catalyst for urea-based hydrogen production, and offers new perspectives into the design and optimization for core-shell structure electrocatalyst.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141463857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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