Rare Metals最新文献

Tuned bi-anisotropy of Y2Co14B nanocrystalline magnetic alloys toward high-frequency applications

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals

Pub Date : 2025-02-01 DOI: 10.1007/s12598-024-03104-x

Ling-Feng Wang, Ke-Bing Wang, Qi-Ming Chen, Chen Wu, Xin-Hua Wang, Mi Yan

The prevalence of wide-bandgap semiconductors urges the development of advanced soft magnetic materials for high-frequency applications. While soft magnetic alloys are limited by resonances at elevated frequencies, the incorporation of planar anisotropy serves as an effective strategy to overcome this dilemma and extend their potential for high-frequency applications. Herein, nanocrystalline Y₂Co₁₄B alloys have been designed with tuned magnetocrystalline and shape bi-anisotropy via melt spinning and magnetic field-assisted annealing. With the application of zero, transverse, rotational and longitudinal magnetic fields (denoted as ZFA, TFA, RFA and LFA), the effects of field direction and annealing time on microstructural and performance evolution have been investigated. Compared with ZFA, magnetic field-assisted annealing not only promotes the growth of nanograins but also alters the coincidence degree between intrinsic easy-plane (IEP) and artificial easy-plane (AEP) structures. While the random distribution of IEP structure is achieved for the RFA due to the formation of non-orientated nanograins, directional magnetic field-assisted annealing contributes to preferentially orientated (006) nanograins, especially for the LFA, resulting in optimal coincidence between the magnetocrystalline anisotropy and shape anisotropy. Such enhancement facilitates the transformation of magnetic domain structures into in-plane configurations with strip-like features. Consequently, a large ratio between the out-of-plane and in-plane anisotropy (H_out/H_in) and improved softness of the alloy can be achieved, providing valuable references for future fabrication of rare-earth (R) transition-metal (T) alloys with superior easy-plane characteristics.

Graphical abstract

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引用次数: 0

The amorphization strategies of two-dimensional transition metal oxide/(oxy)hydroxide nanomaterials for enhanced electrocatalytic water splitting

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals

Pub Date : 2025-01-31 DOI: 10.1007/s12598-024-03082-0

Si-Bin Duan, Yu-Qing Wang, Rui Cao, Yi-Fei Sun, Wen Zhang, Rong-Ming Wang

Amorphous two-dimensional transition metal oxide/(oxy)hydroxide (2D TMO/TMHO) nanomaterials (NMs) have the properties of both 2D and amorphous materials, displaying outstanding physicochemical qualities. Therefore, they demonstrate considerable promise for use in electrocatalytic water splitting applications. Here, the primary amorphization strategies for achieving the 2D TMO/TMHO NMs are comprehensively reviewed, including low-temperature reaction, rapid reaction, exchange/doping effect, ligand modulation, and interfacial energy confinement. By integrating these strategies with various physicochemical synthesis methods, it is feasible to control the amorphization of TMO/TMHO NMs while maintaining the distinctive benefits of their 2D structures. Furthermore, it delves into the structural advantages of amorphous 2D TMO/TMHO NMs in electrocatalytic water splitting, particularly emphasizing recent advancements in enhancing their electrocatalytic performance through interface engineering. The challenges and potential future directions for the precise synthesis and practical application of amorphous 2D TMO/TMHO NMs are also provided. This review aims to establish a theoretical foundation and offer experimental instructions for developing effective and enduring electrocatalysts for water splitting.

Graphical abstract

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引用次数: 0

Nitrogen-doped lignin mesoporous carbon/nickel/oxide nanocomposites with excellent lithium storage properties

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals

Pub Date : 2025-01-30 DOI: 10.1007/s12598-024-03192-9

Ping-Xian Feng, Qi-Liang Chen, Dong-Jie Yang, Huan Wang

Developing high-capacity carbon-based anode materials is crucial for enhancing the performance of lithium-ion batteries (LIBs). In this study, we presented a nitrogen-doped lignin mesoporous carbon/nickel/nickel oxide (NHMC/Ni/NiO) nanocomposite for developing high-capacity LIBs anode materials through carbonization and selective etching strategies. The synthesized NMHC/Ni/NiO-0.33 composite exhibited a highly regular microstructure with well-dispersed Ni/NiO particles. The composite had a surface area of 408 m²⋅g⁻¹, a mesopore ratio of 75.0%, and a pyridine–nitrogen ratio of 58.9%. The introduction of nitrogen atoms reduced the disordered structure of lignin mesoporous carbon and enhanced its electrical conductivity, thus improving the lithium storage capabilities of the composite. Following 100 cycles at a current density of 0.2 A⋅g⁻¹, the composite demonstrated enhanced Coulomb efficiency and rate performance, achieving a specific discharge capacity of 1230.9 mAh⋅g⁻¹. At a high-current density of 1 A⋅g⁻¹, the composite exhibited an excellent specific discharge capacity of 714.6 mAh⋅g⁻¹. This study presents an innovative method for synthesizing high-performance anode materials of LIBs.

Graphical abstract

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引用次数: 0

In-depth understanding of the band alignment and interface states scenario in Bi2O2Se/SrTiO3 ultrathin heterojunction 深入了解 Bi2O2Se/SrTiO3 超薄异质结中的带排列和界面态情况

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals

Pub Date : 2025-01-21 DOI: 10.1007/s12598-024-03062-4

Ke Zhang, Yu-Sen Feng, Lei Hao, Jing Mi, Miao Du, Ming-Hui Xu, Yan Zhao, Jian-Ping Meng, Liang Qiao

Bismuth oxyselenide (Bi₂O₂Se), a novel quasi-two-dimensional charge-carrying semiconductor, is recognized as one of the most promising emerging platforms for next-generation semiconductor devices. Recent advancements in the development of diverse Bi₂O₂Se heterojunctions have unveiled extensive potential applications in both electronics and optoelectronics. However, achieving an in-depth understanding of band alignment and particularly interface dynamics remains a significant challenge. In this study, we conduct a comprehensive experimental investigation into band alignment utilizing high-resolution X-ray photoelectron spectroscopy (HRXPS), while also thoroughly discussing the properties of interface states. Our findings reveal that ultrathin films of Bi₂O₂Se grown on SrTiO₃ (with TiO₂ (001) termination) exhibit Type-I (straddling gap) band alignment characterized by a valence band offset (VBO) of approximately 1.77 ± 0.04 eV and a conduction band offset (CBO) around 0.68 ± 0.04 eV. Notably, when accounting for the influence of interface states, the bands at the interface display a herringbone configuration due to substantial built-in electric fields, which markedly deviate from conventional band alignments. Thus, our results provide valuable insights for advancing high-efficiency electronic and optoelectronic devices, particularly those where charge transfer is highly sensitive to interface states.

{"title":"In-depth understanding of the band alignment and interface states scenario in Bi2O2Se/SrTiO3 ultrathin heterojunction","authors":"Ke Zhang, Yu-Sen Feng, Lei Hao, Jing Mi, Miao Du, Ming-Hui Xu, Yan Zhao, Jian-Ping Meng, Liang Qiao","doi":"10.1007/s12598-024-03062-4","DOIUrl":"10.1007/s12598-024-03062-4","url":null,"abstract":"<p>Bismuth oxyselenide (Bi<sub>2</sub>O<sub>2</sub>Se), a novel quasi-two-dimensional charge-carrying semiconductor, is recognized as one of the most promising emerging platforms for next-generation semiconductor devices. Recent advancements in the development of diverse Bi<sub>2</sub>O<sub>2</sub>Se heterojunctions have unveiled extensive potential applications in both electronics and optoelectronics. However, achieving an in-depth understanding of band alignment and particularly interface dynamics remains a significant challenge. In this study, we conduct a comprehensive experimental investigation into band alignment utilizing high-resolution X-ray photoelectron spectroscopy (HRXPS), while also thoroughly discussing the properties of interface states. Our findings reveal that ultrathin films of Bi<sub>2</sub>O<sub>2</sub>Se grown on SrTiO<sub>3</sub> (with TiO<sub>2</sub> (001) termination) exhibit Type-I (straddling gap) band alignment characterized by a valence band offset (VBO) of approximately 1.77 ± 0.04 eV and a conduction band offset (CBO) around 0.68 ± 0.04 eV. Notably, when accounting for the influence of interface states, the bands at the interface display a herringbone configuration due to substantial built-in electric fields, which markedly deviate from conventional band alignments. Thus, our results provide valuable insights for advancing high-efficiency electronic and optoelectronic devices, particularly those where charge transfer is highly sensitive to interface states.</p>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 2","pages":"1204 - 1212"},"PeriodicalIF":9.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interface engineering and anion etching facilitating electronic modulation and surface reconstruction of FeSe@NiSe heterostructure catalysts to promote water splitting

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals

Pub Date : 2024-12-11 DOI: 10.1007/s12598-024-03114-9

Jie Han, Miao-Miao Bai, Tao-Tao Ai, Wei-Wei Bao, Xue-Ling Wei, Xiang-Yu Zou, Zhi-Feng Deng, Yong Wang, Wen-Hu Li, Jun-Gang Hou, Ling-Jiang Kou

Transition metal selenides (TMSs) are effective pre-electrocatalysts and are commonly used in electrochemical processes. During the electrocatalytic oxygen evolution reaction (OER), metal cations in TMSs are in-situ reconstructed and converted into high-valence metal oxyhydroxides. However, a limited understanding of the effects of electro-oxidation and anion leaching has resulted in insufficient theoretical guidance for the rational design of efficient catalysts. Herein, FeSe@NiSe nanorods were fabricated for the OER using a facile hydrothermal selenization method supported on FeNi foam. In-situ Raman spectroscopy and multiple characterization techniques were employed to elucidate the mechanism of FeSe@NiSe surface evolution. Metal cations on the catalyst surface were reconstructed and converted into OER-active species Fe/NiOOH at low potential. As the applied potential increased, electro-oxidation and leaching of Se occurred, resulting in SeO₄²⁻ adsorption on the catalyst surface, which further enhanced catalytic activity. As a result, the reconstructed FeSe@NiSe/iron-nickel foam (INF) exhibited exceptional catalytic activity for OER, achieving an ultralow overpotential of 283 mV at a current density of 100 mA·cm⁻². Notably, the bifunctional FeSe@NiSe/INF electrode facilitated overall water splitting, affording a current density of 10 mA·cm⁻² only at 1.53 V, even superior to the noble RuO₂(+)||Pt/C(−). This work offers valuable insights into the surface evolution and electrocatalytic mechanisms of TMSs.

Graphical abstract

{"title":"Interface engineering and anion etching facilitating electronic modulation and surface reconstruction of FeSe@NiSe heterostructure catalysts to promote water splitting","authors":"Jie Han, Miao-Miao Bai, Tao-Tao Ai, Wei-Wei Bao, Xue-Ling Wei, Xiang-Yu Zou, Zhi-Feng Deng, Yong Wang, Wen-Hu Li, Jun-Gang Hou, Ling-Jiang Kou","doi":"10.1007/s12598-024-03114-9","DOIUrl":"10.1007/s12598-024-03114-9","url":null,"abstract":"<div><p>Transition metal selenides (TMSs) are effective pre-electrocatalysts and are commonly used in electrochemical processes. During the electrocatalytic oxygen evolution reaction (OER), metal cations in TMSs are in-situ reconstructed and converted into high-valence metal oxyhydroxides. However, a limited understanding of the effects of electro-oxidation and anion leaching has resulted in insufficient theoretical guidance for the rational design of efficient catalysts. Herein, FeSe@NiSe nanorods were fabricated for the OER using a facile hydrothermal selenization method supported on FeNi foam. In-situ Raman spectroscopy and multiple characterization techniques were employed to elucidate the mechanism of FeSe@NiSe surface evolution. Metal cations on the catalyst surface were reconstructed and converted into OER-active species Fe/NiOOH at low potential. As the applied potential increased, electro-oxidation and leaching of Se occurred, resulting in SeO<sub>4</sub><sup>2−</sup> adsorption on the catalyst surface, which further enhanced catalytic activity. As a result, the reconstructed FeSe@NiSe/iron-nickel foam (INF) exhibited exceptional catalytic activity for OER, achieving an ultralow overpotential of 283 mV at a current density of 100 mA·cm<sup>−2</sup>. Notably, the bifunctional FeSe@NiSe/INF electrode facilitated overall water splitting, affording a current density of 10 mA·cm<sup>−2</sup> only at 1.53 V, even superior to the noble RuO<sub>2</sub>(+)||Pt/C(−). This work offers valuable insights into the surface evolution and electrocatalytic mechanisms of TMSs.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 2","pages":"1096 - 1107"},"PeriodicalIF":9.6,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self-assembled co-delivery system of gold nanoparticles and paclitaxel based on in-situ dynamic covalent chemistry for synergistic chemo-photothermal therapy 基于原位动态共价化学的金纳米粒子与紫杉醇自组装共递送系统协同化学光热治疗

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals

Pub Date : 2024-12-06 DOI: 10.1007/s12598-024-03047-3

Xiao-Xia Wu, Ding-Hu Zhang, Yi-Nan Ding, Fei Cao, Yang Li, Jun-Lie Yao, Xin-Yu Miao, Lu-Lu He, Jun Luo, Jian-Wei Li, Jie Lin, Ai-Guo Wu, Jia-Ping Zheng

Recently, stimuli-responsive nanocarriers capable of precision drug release have garnered significant attention in the field of drug delivery. Here, an in-situ dynamic covalent self-assembled (DCS) strategy was utilized to develop a co-delivery system. This assembly was based on a thiol-disulfide-exchange reaction, producing disulfide macrocycles in an oxidizing aerial environment. These macrocycles encapsulated the anti-cancer drug (paclitaxel, PTX) on the surface of gold nanoparticles, which served as photothermal therapy agents during the self-assembly. In the DCS process, the kinetic control over the concentration of each building unit within the reaction system led to the formation of a stable co-delivery nanosystem with optimal drug-loading efficiency. Notably, the high glutathione (GSH) concentrations in tumor cells caused the disulfide macrocycles in nanostructures to break, resulting in drug release. The stimuli-responsive performances of the prepared nanosystems were determined by observing the molecular structures and drug release. The results revealed that the self-assembled nanosystem exhibited GSH-triggered drug release and good photothermal conversion capability under near-infrared light. Moreover, the in vitro and in vivo results revealed that conjugating the targeting molecule of cRGD with co-delivery nanosystem enhanced its biocompatibility, chemo-photothermal anti-cancer effect. Overall, our findings indicated that in-situ DCS strategy enhanced the control over drug loading during the construction of the co-delivery system, paving a way for the development of more functional carriers in nanomedicine.

Graphical abstract

近年来，刺激反应型纳米载体在药物释放领域引起了广泛的关注。在这里，利用原位动态共价自组装（DCS）策略来开发共递送系统。该组装基于硫醇-二硫交换反应，在氧化空气环境中产生二硫大环。这些大环将抗癌药物（紫杉醇，PTX）包裹在金纳米颗粒表面，在自组装过程中充当光热治疗剂。在DCS过程中，通过对反应体系内各构建单元浓度的动力学控制，形成了具有最佳载药效率的稳定共递送纳米体系。值得注意的是，肿瘤细胞中的高谷胱甘肽（GSH）浓度导致纳米结构中的二硫大环断裂，导致药物释放。通过观察制备的纳米系统的分子结构和药物释放来确定其刺激响应性能。结果表明，该自组装纳米体系在近红外光下具有gsh触发的药物释放和良好的光热转化能力。此外，体外和体内实验结果表明，将cRGD靶向分子与共递送纳米系统偶联可增强其生物相容性和化学光热抗癌作用。总之，我们的研究结果表明，原位DCS策略在共递送系统构建过程中增强了对药物负载的控制，为纳米医学中更多功能载体的开发铺平了道路。图形抽象

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引用次数: 0

Microstructural evolution and phase composition of In2Ga2ZnO7 ceramic targets during sintering

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals

Pub Date : 2024-12-02 DOI: 10.1007/s12598-024-03083-z

Chao Qi, Jie Chen, Kang-Wei Yue, Ben-Shuang Sun, Shi Wang, Fan Yang, Xin-Bo Xing, Ji-Lin He

The photovoltaic properties of indium–gallium–zinc oxide (IGZO) thin film utilized in electronic information applications depend on the quality and performance of the corresponding target. In this study, high-energy ball milling was combined with atmospheric sintering to achieve precise control over the phase composition and microstructure of In₂Ga₂ZnO₇ ceramic targets. This was achieved by controlling the sintering process and performing thermodynamic calculations to analyze the phase transition process. Further, the electronic structure simulation results of the relevant phases were analyzed, and crystal structure models were constructed. According to the density functional theory calculations, the enthalpy of formation of In₂Ga₂ZnO₇ was found to be the largest, followed by those of InGaZnO₄ and ZnGa₂O₄, which indicates that the In₂Ga₂ZnO₇ phase exhibits the highest thermal stability. The relationship of the enthalpy of formation corresponds to two distinct reactions of the IGZO powders. The ZnGa₂O₄ phase is initially formed and remains stable for an extended period. This is followed by the rapid formation and subsequent disappearance of the InGaZnO₄ phase within a narrow temperature range. Finally, a single In₂Ga₂ZnO₇ phase is formed. The target sintered at 1500 °C exhibits a narrow band gap and the lowest porosity, which results in the highest relative density (99.52%) and the lowest resistivity (3.4 mΩ·cm). These experimental findings can provide guidelines for controlling the phase and microstructural characteristics of In₂Ga₂ZnO₇ targets with the aim of producing IGZO targets with excellent properties, including homogeneous composition, high density, and low resistance in the field of flat displays.

Graphical abstract

{"title":"Microstructural evolution and phase composition of In2Ga2ZnO7 ceramic targets during sintering","authors":"Chao Qi, Jie Chen, Kang-Wei Yue, Ben-Shuang Sun, Shi Wang, Fan Yang, Xin-Bo Xing, Ji-Lin He","doi":"10.1007/s12598-024-03083-z","DOIUrl":"10.1007/s12598-024-03083-z","url":null,"abstract":"<div><p>The photovoltaic properties of indium–gallium–zinc oxide (IGZO) thin film utilized in electronic information applications depend on the quality and performance of the corresponding target. In this study, high-energy ball milling was combined with atmospheric sintering to achieve precise control over the phase composition and microstructure of In<sub>2</sub>Ga<sub>2</sub>ZnO<sub>7</sub> ceramic targets. This was achieved by controlling the sintering process and performing thermodynamic calculations to analyze the phase transition process. Further, the electronic structure simulation results of the relevant phases were analyzed, and crystal structure models were constructed. According to the density functional theory calculations, the enthalpy of formation of In<sub>2</sub>Ga<sub>2</sub>ZnO<sub>7</sub> was found to be the largest, followed by those of InGaZnO<sub>4</sub> and ZnGa<sub>2</sub>O<sub>4</sub>, which indicates that the In<sub>2</sub>Ga<sub>2</sub>ZnO<sub>7</sub> phase exhibits the highest thermal stability. The relationship of the enthalpy of formation corresponds to two distinct reactions of the IGZO powders. The ZnGa<sub>2</sub>O<sub>4</sub> phase is initially formed and remains stable for an extended period. This is followed by the rapid formation and subsequent disappearance of the InGaZnO<sub>4</sub> phase within a narrow temperature range. Finally, a single In<sub>2</sub>Ga<sub>2</sub>ZnO<sub>7</sub> phase is formed. The target sintered at 1500 °C exhibits a narrow band gap and the lowest porosity, which results in the highest relative density (99.52%) and the lowest resistivity (3.4 mΩ·cm). These experimental findings can provide guidelines for controlling the phase and microstructural characteristics of In<sub>2</sub>Ga<sub>2</sub>ZnO<sub>7</sub> targets with the aim of producing IGZO targets with excellent properties, including homogeneous composition, high density, and low resistance in the field of flat displays.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 2","pages":"1363 - 1379"},"PeriodicalIF":9.6,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unraveling the cryogenic formability in high entropy alloy sheets under complex stress conditions 揭示复杂应力条件下高熵合金板的低温成形性

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals

Pub Date : 2024-11-29 DOI: 10.1007/s12598-024-03075-z

Ke-Yan Wang, Zi-Jian Cheng, Zhi-Liang Ning, Hai-Ping Yu, Parthiban Ramasamy, Jürgen Eckert, Jian-Fei Sun, Alfonso H. W. Ngan, Yong-Jiang Huang

This work investigates how temperature and microstructural evolution affect the formability of face-centered cubic (fcc) structured CoCrFeNiMn_0.75Cu_0.25 high entropy alloy (HEA) sheets under complex stress conditions. Erichsen cupping tests were conducted to quantitatively evaluate the deformation capacity at room temperature (298 K) and cryogenic temperatures. The findings reveal a strong temperature dependence on the formability of the HEA. A decrease in the deformation temperature from 298 to 93 K causes a significant increase in both the Erichsen index (IE) (from 9.8 to 12.4 mm) and the expansion rate (δ) of surface area (from 51.6% to 76.3%), as well as a reduction in the average deviation (η) of thickness (from 55.1% to 44.4%), signifying its ultrahigh formability and uniform deformation capability at cryogenic temperature. This enhancement is attributed to the transition in the deformation mechanism from single dislocation slip at 298 K to a cooperative of plastic deformation mechanisms at 93 K, involving dislocation slip, stacking faults (SFs), Lomer-Cottrell (L-C) locks and multi-scale nanotwins. The lower stacking fault energy of the alloy facilitates these deformation mechanisms, particularly the formation of SFs and nanotwins, which enhance ductility and strength by providing additional pathways for plastic deformation. These mechanisms collectively contribute to delaying plastic instability, thereby improving the overall formability. This work provides a comprehensive understanding of the underlying reasons for the enhanced formability of HEAs at cryogenic temperatures, offering valuable insights for their practical use in challenging environments.

Graphical abstract

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引用次数: 0

Multi-scale inhomogeneity and anomalous mechanical response of nanoscale metallic glass pillar by cryogenic thermal cycling 低温热循环对纳米级金属玻璃支柱的多尺度不均匀性和异常力学响应

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals

Pub Date : 2024-11-09 DOI: 10.1007/s12598-024-02964-7

Xiao Liu, Si-Yi Di, Jing Zhou, Fang Miao, Hong-Ze Wang, Yi Wu, Hao-Wei Wang, Hai-Bo Ke, Qiang Li

The mechanical responses and structure variations of Ta₈₀Co₂₀ nanoscale metallic glass (MG) film samples upon cryogenic thermal cycling (CTC) treatment were studied. The simultaneous improvements of strength and deformation ability bring about a super-high strength of 4.5 GPa and a large plastic strain of about 80% after CTC treatment. The significant increase in inter-element bonding and hardness makes the activation and percolation of shear transformation zones to be more difficult and delays the yielding event, leading to the ultra-high strength. Although the TaCo MG pillar reaches a relaxation energy state, the micro- and nanoscale inhomogeneities remain induced by the local densely packed units along with crystal-like ordering embedded in the matrix. The multi-scale inhomogeneity can effectively hinder the sliding of the shear bands and improve their propagation stability, which is considered to be the origin of its excellent plasticity. Our study reveals another prospect of CTC treatment on nanoscale MG samples of constructing an anomalous inhomogeneous structure and obtaining simultaneous enhancement of strength and plasticity.

研究了 Ta80Co20 纳米级金属玻璃（MG）薄膜样品经低温热循环（CTC）处理后的力学响应和结构变化。经过 CTC 处理后，强度和变形能力同时提高，从而获得了 4.5 GPa 的超高强度和 80% 左右的大塑性应变。元素间结合力和硬度的大幅提高使剪切转化区的激活和渗流变得更加困难，并推迟了屈服事件的发生，从而实现了超高强度。虽然 TaCo MG 柱达到了弛豫能态，但由于基体中嵌入的局部密集单元和晶体有序性，微米和纳米尺度的不均匀性依然存在。多尺度不均匀性能有效阻碍剪切带的滑动并提高其传播稳定性，这被认为是其优异塑性的根源。我们的研究揭示了四氯化碳处理纳米级 MG 样品的另一个前景，即构建异常非均质结构并同时提高强度和塑性。

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引用次数: 0

Preparation and electrocatalytic performance of novel-integrated Ni-Mo sulfide electrode materials for water splitting 新型集成硫化镍电极材料的制备与电催化性能

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals

Pub Date : 2024-11-08 DOI: 10.1007/s12598-024-03031-x

Shan-Shan Li, Qing-He Yu, Jing Mi, Lei Hao, Li-Jun Jiang, Shu-Xian Zhuang

Advanced electrode materials for electrocatalysis of electrolytic decomposition are crucial materials in the field of hydrogen production from renewable energy. In this work, a new type of integrated hydrogen evolution electrode material was synthesized by selective acidification etching and in situ growth technology. A novel-integrated Ni-Mo sulfide electrode material with a three-dimensional network structure was successfully prepared using a two-step method (convenient surface modification and in situ growth techniques), which involved surface modification at 30% HNO₃ for 10 min and followed by annealing treatment at 600 °C for 1 h with 10 °C·min⁻¹ heating rate. The structure displayed an electrochemical active surface area (ECSA) of 30.125 mF·cm⁻², calculated on 0.10–0.30 V (vs. RHE) CV curves with a 5–50 mV·s⁻¹ sweep rate range. The ECSA of other samples was also tested by aforementioned methods, which had great distinction on ECSA with different samples. The novel-integrated Ni-Mo sulfide electrode material appeared to have extremity electrochemical performance in a three-electrode configuration employing 1 M KOH solution as an electrolyte, including an excellent hydrogen evolution overpotential of 346 mV at the current density of 500 mA·cm⁻², superior Tafel slope with 103 mV·dec⁻¹. Such outstanding electrochemical performances of the novel-integrated Ni-Mo sulfide electrode materials were directly related to the distinctive integrated structure. Therefore, it was facility to find that the successful preparation of novel-integrated Ni-Mo sulfide electrode material provided more selection opportunities for alkaline electrolysis of water and offered an innovative mentality for the preparation of other types of electrode materials.

Graphical abstract

先进的电催化分解电极材料是可再生能源制氢领域的关键材料。本研究采用选择性酸化刻蚀和原位生长技术合成了一种新型集成氢进化电极材料。采用两步法（便捷的表面改性和原位生长技术）成功制备了一种具有三维网络结构的新型集成硫化镍钼电极材料，包括在 30% HNO3 溶液中进行 10 分钟的表面改性，然后在 600 °C 下以 10 °C-min-1 的升温速率退火处理 1 小时。根据 5-50 mV-s-1 扫频范围内 0.10-0.30 V（相对于 RHE）CV 曲线计算，该结构的电化学活性表面积（ECSA）为 30.125 mF-cm-2。其他样品的 ECSA 也通过上述方法进行了测试，不同样品的 ECSA 差别很大。在以 1 M KOH 溶液为电解质的三电极配置中，新型集成硫化镍钼电极材料具有极佳的电化学性能，包括在 500 mA-cm-2 的电流密度下具有 346 mV 的优异氢进化过电位，103 mV-dec-1 的出色塔菲尔斜率。新型集成硫化镍钼电极材料如此出色的电化学性能与独特的集成结构直接相关。因此，新型集成硫化镍钼电极材料的成功制备为碱性电解水提供了更多的选择机会，也为制备其他类型的电极材料提供了创新思路。

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引用次数: 0