Nickel - Cobalt layered double hydroxide (NiCo LDH) based supercapacitors suffer from severe self-discharge due to their uneven charge distribution, which affects the application of supercapacitors (SCs) in real life. In this paper, three-dimensional self-supported mesoporous NiCo layered double hydroxide mesoporous on nickel foam (NF) (NiCo LDHMs/NF) was prepared by HO etching. The self-discharge phenomenon of supercapacitors assembled using the reaction-derived NiCo LDHMs/NF as the positive electrode and activated carbon as the negative electrode is significantly suppressed. Comparing with the original NiCo LDH devices, the successful construction of mesoporous structures in NiCo LDH resulted in slower open-circuit voltage (OCV) decay (0.93 V vs. 0.59 V in the range of open-circuit voltage of 1.8 V for the same time of 7200 S), and lower leakage current (0.09 mA vs. 0.18 mA at 1.8 V). Due to the formation of mesoporous structure, the charged ions adsorbed on the electrode have more storage sites. Which reduces the movement or loss of charged ions to inhibit the charge redistribution, so it has a high specific capacitance and the self-discharge phenomenon has been greatly reduced.
基于镍钴层状双氢氧化物（NiCo LDH）的超级电容器因其电荷分布不均匀而存在严重的自放电问题，影响了超级电容器（SC）在实际生活中的应用。本文通过 HO 刻蚀法制备了泡沫镍（NF）上的三维自支撑介孔镍钴层状双氢氧化物介孔（NiCo LDHMs/NF）。以反应制备的 NiCo LDHMs/NF 为正极、活性炭为负极组装的超级电容器的自放电现象得到显著抑制。与原始的镍钴 LDH 器件相比，介孔结构在镍钴 LDH 中的成功构建使得开路电压（OCV）衰减更慢（在相同的 7200 S 时间内，在 1.8 V 的开路电压范围内为 0.93 V 对 0.59 V），漏电流更低（在 1.8 V 时为 0.09 mA 对 0.18 mA）。由于形成了介孔结构，电极上吸附的带电离子有了更多的储存位点。这减少了带电离子的移动或流失，抑制了电荷的再分布，因此它具有很高的比电容，自放电现象也大大减少。
{"title":"Mitigating self-discharge in supercapacitors through strategic mesoporous structural modification of NiCo layered double hydroxides","authors":"Shanshan Bai, Bingzhe Jia, Yuxuan Zhang, Huailin Yang, Xinrui Qiang, Xinming Wu","doi":"10.1016/j.jallcom.2024.175441","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175441","url":null,"abstract":"Nickel - Cobalt layered double hydroxide (NiCo LDH) based supercapacitors suffer from severe self-discharge due to their uneven charge distribution, which affects the application of supercapacitors (SCs) in real life. In this paper, three-dimensional self-supported mesoporous NiCo layered double hydroxide mesoporous on nickel foam (NF) (NiCo LDHMs/NF) was prepared by HO etching. The self-discharge phenomenon of supercapacitors assembled using the reaction-derived NiCo LDHMs/NF as the positive electrode and activated carbon as the negative electrode is significantly suppressed. Comparing with the original NiCo LDH devices, the successful construction of mesoporous structures in NiCo LDH resulted in slower open-circuit voltage (OCV) decay (0.93 V vs. 0.59 V in the range of open-circuit voltage of 1.8 V for the same time of 7200 S), and lower leakage current (0.09 mA vs. 0.18 mA at 1.8 V). Due to the formation of mesoporous structure, the charged ions adsorbed on the electrode have more storage sites. Which reduces the movement or loss of charged ions to inhibit the charge redistribution, so it has a high specific capacitance and the self-discharge phenomenon has been greatly reduced.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545821","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 : 2024-07-03DOI: 10.1016/j.jallcom.2024.175409
Jianqiang Zhang, Zihao Shuang, Xuhui Zhang, Boao Xiao, Bin Ren, Guoping Zhang, Hai Zhou
In recent years, lead halide perovskites have been extensively researched in the optoelectronics field due to their excellent optical and electrical properties, while the inherent toxicity and instability of lead halide perovskites have hindered their commercialization. Stable, lead-free perovskites as a substitute of the Pb-based perovskites show great attention. Herein, the green antisolvent diethyl carbonate is introduced to realize the low-temperature fabrication of nontoxic perovskite AgBiI. The AgBiI perovskite photodetector (PD) shows excellent performance with a detectivity of as high as 1.13 × 10 Jones and a linear dynamic range (LDR) of 147 dB. Besides, the weak light with the light intensity of as low as 18.3 nW/cm can be detected by our PD. Moreover, the flexible PDs are also prepared with this low-temperature process, which shows good device performance with stable bending resistance characteristics. Based on the excellent optoelectronic properties of the AgBiI PDs, a gesture recognition system is built which can realize rapid and accurate gesture recognition under ordinary indoor light, with an accuracy of 98.35 %. Our research provides new insights for the development and application of green and environmentally friendly perovskite PD.
{"title":"Low-temperature fabrication of lead-free Ag2BiI5 perovskite photodetector with excellent weak light detection ability for accurate gesture recognition","authors":"Jianqiang Zhang, Zihao Shuang, Xuhui Zhang, Boao Xiao, Bin Ren, Guoping Zhang, Hai Zhou","doi":"10.1016/j.jallcom.2024.175409","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175409","url":null,"abstract":"In recent years, lead halide perovskites have been extensively researched in the optoelectronics field due to their excellent optical and electrical properties, while the inherent toxicity and instability of lead halide perovskites have hindered their commercialization. Stable, lead-free perovskites as a substitute of the Pb-based perovskites show great attention. Herein, the green antisolvent diethyl carbonate is introduced to realize the low-temperature fabrication of nontoxic perovskite AgBiI. The AgBiI perovskite photodetector (PD) shows excellent performance with a detectivity of as high as 1.13 × 10 Jones and a linear dynamic range (LDR) of 147 dB. Besides, the weak light with the light intensity of as low as 18.3 nW/cm can be detected by our PD. Moreover, the flexible PDs are also prepared with this low-temperature process, which shows good device performance with stable bending resistance characteristics. Based on the excellent optoelectronic properties of the AgBiI PDs, a gesture recognition system is built which can realize rapid and accurate gesture recognition under ordinary indoor light, with an accuracy of 98.35 %. Our research provides new insights for the development and application of green and environmentally friendly perovskite PD.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545925","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 : 2024-07-03DOI: 10.1016/j.jallcom.2024.175447
Peng Yu, Juan Tan, Ronghao Zhuang, Jing Tang, Zhiguo Wang, Chun Zhang, Qiongchao Wang, Xinxin Xiao, Wei Huang
Reutilizing heavy metal enriched adsorbents into efficient photocatalysts for antibiotic removal is of great economic value. Herein, spent alkali-lignin biochar (ALB) with enriched Zn/Cd ions is valorized into ZnS-CdS/C photocatalyst via a simple vulcanization method. ZnS-CdS/C (3:1) exhibits a superior photocatalytic removal efficiency of 98.6 % for levofloxacin (LEV), with about 60 % of the initial value remained after four cycles. It also shows good photocatalytic removal efficiencies of 92.1 %, 95.4 % and 84.0 % for enrofloxacin, ciprofloxacin and tetracycline, respectively. Electron paramagnetic resonance (ESR) shows that the introduction of ZnS and CdS in ALB promotes the generation of oxygen vacancies and persistent free radicals (PFRs). The photocatalytic LEV removal mechanism of ZnS-CdS/C indicates that both the abundant PFRs and photogenerated electrons serve as electron donors, efficiently reducing dioxygen to superoxide free radicals (·O). The ·O formed in the above two ways continuously degrade the LEV molecules. Finally, the biotoxicity and developmental toxicity of LEV degradation intermediates confirms that the ZnS-CdS/C degradation system can remove LEV effectively with reduced harm to the ecological environment.
{"title":"Valorization of heavy metals enriched ALB adsorbents as effective ZnS-CdS/C photocatalysts for antibiotics removal","authors":"Peng Yu, Juan Tan, Ronghao Zhuang, Jing Tang, Zhiguo Wang, Chun Zhang, Qiongchao Wang, Xinxin Xiao, Wei Huang","doi":"10.1016/j.jallcom.2024.175447","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175447","url":null,"abstract":"Reutilizing heavy metal enriched adsorbents into efficient photocatalysts for antibiotic removal is of great economic value. Herein, spent alkali-lignin biochar (ALB) with enriched Zn/Cd ions is valorized into ZnS-CdS/C photocatalyst via a simple vulcanization method. ZnS-CdS/C (3:1) exhibits a superior photocatalytic removal efficiency of 98.6 % for levofloxacin (LEV), with about 60 % of the initial value remained after four cycles. It also shows good photocatalytic removal efficiencies of 92.1 %, 95.4 % and 84.0 % for enrofloxacin, ciprofloxacin and tetracycline, respectively. Electron paramagnetic resonance (ESR) shows that the introduction of ZnS and CdS in ALB promotes the generation of oxygen vacancies and persistent free radicals (PFRs). The photocatalytic LEV removal mechanism of ZnS-CdS/C indicates that both the abundant PFRs and photogenerated electrons serve as electron donors, efficiently reducing dioxygen to superoxide free radicals (·O). The ·O formed in the above two ways continuously degrade the LEV molecules. Finally, the biotoxicity and developmental toxicity of LEV degradation intermediates confirms that the ZnS-CdS/C degradation system can remove LEV effectively with reduced harm to the ecological environment.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545834","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 : 2024-07-03DOI: 10.1016/j.jallcom.2024.175425
Yuna Wu, Wangjun Zhang, Yun Li, Fei Yang, Huan Liu, Jin Zou, Jinghua Jiang, Feng Fang, Aibin Ma
Pure copper has excellent conductivity but low strength, which greatly limits its application in many fields. In recent years, developing high-strength and high-conductivity (HSHC) copper alloys has been gaining increasing traction. Copper-iron (Cu-Fe) alloys hold great application potential in power, electronics, communications, railway transportation and other industries due to their cost-effectiveness and comprehensive plasticity. In this review, we begin with a brief analysis of two primary factors that limit the development of HSHC Cu-Fe alloys. We then summarize the major results on how to enhance the strength, conductivity, and electromagnetic shielding performance of Cu-Fe alloys by improving the forming processes and adjusting the microstructure evolution and highlight the underlying strengthening mechanisms. We close by providing new insights into the application prospect and future research directions of Cu-Fe alloys with both high strength and conductivity.
{"title":"An overview of microstructure regulation treatment of Cu-Fe alloys to improve strength, conductivity, and electromagnetic shielding","authors":"Yuna Wu, Wangjun Zhang, Yun Li, Fei Yang, Huan Liu, Jin Zou, Jinghua Jiang, Feng Fang, Aibin Ma","doi":"10.1016/j.jallcom.2024.175425","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175425","url":null,"abstract":"Pure copper has excellent conductivity but low strength, which greatly limits its application in many fields. In recent years, developing high-strength and high-conductivity (HSHC) copper alloys has been gaining increasing traction. Copper-iron (Cu-Fe) alloys hold great application potential in power, electronics, communications, railway transportation and other industries due to their cost-effectiveness and comprehensive plasticity. In this review, we begin with a brief analysis of two primary factors that limit the development of HSHC Cu-Fe alloys. We then summarize the major results on how to enhance the strength, conductivity, and electromagnetic shielding performance of Cu-Fe alloys by improving the forming processes and adjusting the microstructure evolution and highlight the underlying strengthening mechanisms. We close by providing new insights into the application prospect and future research directions of Cu-Fe alloys with both high strength and conductivity.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545924","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}
Under the global dual-carbon goal, photocatalysis technology is being employed as a green technology for NO removal and hydrogen production. However, the application of photocatalysts is often limited by the weak response to visible light and the low separation efficiency of photogenerated carriers. In this paper, we designed a simple and efficient photocatalyst Au@NM-125/PdTCPP for NO removal and hydrogen evolution. By adding PdTCPP molecule with excellent light absorption ability combine with MIL-125-NH(Ti), the introduction of PdTCPP expands the absorption range of visible light. On the other hand, the introduction of Au NPs with surface plasmon resonance effect promotes electron transport between PdTCPP and MIL-125-NH(Ti), thus greatly improving the photocatalytic performance. Compared with the NO removal efficiency of the original NM-125 (22.06 %), the NO removal rate of NM-125/PdTCPP was 63.72 %, while the NO removal rate of Au@NM-125/PdTCPP was the highest, reaching 73.23 %. What’s more, Au@NM-125/PdTCPP also demonstrated excellent hydrogen evolution performance (12.659 mmol/g, in 4 h), with a hydrogen evolution effect 2.14 times that of NM-125/PdTCPP (5.911 mmol/g, in 4 h) and 6.85 times that of the initial NM-125 (1.848 mmol/g, in 4 h). Based on the results of UV-Vis spectroscopy, Mott-Schottky and XPS spectrum, we proposed a possible photocatalytic mechanism, the suitable band gap value of MIL-125-NH(Ti) and PdTCPP makes them form a Z-scheme heterojunction, where electrons flow from PdTCPP to MIL-125-NH(Ti), and Au NPs acts as an electron bridge to promote more electron transfer, thus improving the photocatalytic performance. It is a practicable strategy to achieve excellent photocatalytic performance by combining metalloporphyrin molecules as semiconductors directly with MOFs to form heterojunctions and adding Au NPs as electronic bridges, which is also valuable for environmental remediation and energy production.
{"title":"Z-scheme MIL-125-NH2(Ti)/PdTCPP heterojunction accelerates carrier separation via Au NPs electron bridge for efficient photocatalytic NO removal and hydrogen evolution","authors":"Yue Li, Junhao Zhou, Xiaoping He, Youzhou He, Jiajia Jing, Xingyan Liu, Siqi Li, Siping Wei","doi":"10.1016/j.jallcom.2024.175428","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175428","url":null,"abstract":"Under the global dual-carbon goal, photocatalysis technology is being employed as a green technology for NO removal and hydrogen production. However, the application of photocatalysts is often limited by the weak response to visible light and the low separation efficiency of photogenerated carriers. In this paper, we designed a simple and efficient photocatalyst Au@NM-125/PdTCPP for NO removal and hydrogen evolution. By adding PdTCPP molecule with excellent light absorption ability combine with MIL-125-NH(Ti), the introduction of PdTCPP expands the absorption range of visible light. On the other hand, the introduction of Au NPs with surface plasmon resonance effect promotes electron transport between PdTCPP and MIL-125-NH(Ti), thus greatly improving the photocatalytic performance. Compared with the NO removal efficiency of the original NM-125 (22.06 %), the NO removal rate of NM-125/PdTCPP was 63.72 %, while the NO removal rate of Au@NM-125/PdTCPP was the highest, reaching 73.23 %. What’s more, Au@NM-125/PdTCPP also demonstrated excellent hydrogen evolution performance (12.659 mmol/g, in 4 h), with a hydrogen evolution effect 2.14 times that of NM-125/PdTCPP (5.911 mmol/g, in 4 h) and 6.85 times that of the initial NM-125 (1.848 mmol/g, in 4 h). Based on the results of UV-Vis spectroscopy, Mott-Schottky and XPS spectrum, we proposed a possible photocatalytic mechanism, the suitable band gap value of MIL-125-NH(Ti) and PdTCPP makes them form a Z-scheme heterojunction, where electrons flow from PdTCPP to MIL-125-NH(Ti), and Au NPs acts as an electron bridge to promote more electron transfer, thus improving the photocatalytic performance. It is a practicable strategy to achieve excellent photocatalytic performance by combining metalloporphyrin molecules as semiconductors directly with MOFs to form heterojunctions and adding Au NPs as electronic bridges, which is also valuable for environmental remediation and energy production.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545825","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 : 2024-07-02DOI: 10.1016/j.jallcom.2024.175345
Farooq Ahmad, R. Vignesh Babu, Xizhou Kai, Muhammad Raies Abdullah, Mahadi Hasan, Soban Muddassir Dar, Abdul Wasy Zia, Yutao Zhao, Lin Zhang
This study investigates the impact of increasing oxygen levels on structure, and mechanical properties and tribological performance of duplex AlCrSiON coatings. AISI H13 steel and tungsten carbide substrates are coated using arc ion plating with increasing oxygen flow rate up to 200 sccm with varying oxygen concentration. High-resolution transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and three-dimensional profilometer are used to study morphological and structural evolution. Correspondingly, the coatings are assessed for hardness, adhesion strength, friction coefficient, and resistance against corrosion and wear. A 50–100 sccm oxygen flow rate is considered as an optimal range to receive lower surface roughness. Generally, the addition of oxygen has compromised hardness and friction coefficient but improve adhesion strength, wear and corrosion resistance with increasing oxygen concentration. The immersion tests have identified pitting corrosion as a dominating failure mechanism for AlCrSiON coatings when exposed to molten A380 aluminium alloy. This corrosion resistance stems from their dense microstructure, excellent thermal stability, and the presence of fcc-(Al, Cr)O phase structure. This study demonstrates that controlled oxygen concentration is a crucial parameter for tuning the microstructure of AlCrSiON coatings to achieve superior mechanical, tribological, and anti-corrosion performance, particularly for high-pressure die-casting applications.
{"title":"Oxygen concentration – A governing parameter for microstructural tailoring of duplex AlCrSiON coatings for superior mechanical, tribological, and anti-corrosion performance","authors":"Farooq Ahmad, R. Vignesh Babu, Xizhou Kai, Muhammad Raies Abdullah, Mahadi Hasan, Soban Muddassir Dar, Abdul Wasy Zia, Yutao Zhao, Lin Zhang","doi":"10.1016/j.jallcom.2024.175345","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175345","url":null,"abstract":"This study investigates the impact of increasing oxygen levels on structure, and mechanical properties and tribological performance of duplex AlCrSiON coatings. AISI H13 steel and tungsten carbide substrates are coated using arc ion plating with increasing oxygen flow rate up to 200 sccm with varying oxygen concentration. High-resolution transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and three-dimensional profilometer are used to study morphological and structural evolution. Correspondingly, the coatings are assessed for hardness, adhesion strength, friction coefficient, and resistance against corrosion and wear. A 50–100 sccm oxygen flow rate is considered as an optimal range to receive lower surface roughness. Generally, the addition of oxygen has compromised hardness and friction coefficient but improve adhesion strength, wear and corrosion resistance with increasing oxygen concentration. The immersion tests have identified pitting corrosion as a dominating failure mechanism for AlCrSiON coatings when exposed to molten A380 aluminium alloy. This corrosion resistance stems from their dense microstructure, excellent thermal stability, and the presence of fcc-(Al, Cr)O phase structure. This study demonstrates that controlled oxygen concentration is a crucial parameter for tuning the microstructure of AlCrSiON coatings to achieve superior mechanical, tribological, and anti-corrosion performance, particularly for high-pressure die-casting applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141556903","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 : 2024-07-02DOI: 10.1016/j.jallcom.2024.175429
Tian Tian, Wanting Wang, Kexin Li, Yiping Wang, Wensheng Fu
Exploring efficient multi-functional catalysts with is critical for oxidase-like catalysis and environmental pollutant degradation. In this paper, we report a RuCo alloy embedded in a nitrogen-doped carbon matrix (RuCo@NC) derived from a Co-based metal-organic framework (ZIF-67). RuCo@NC exhibits highly efficient oxidase activity for dopamine (DA) detection, excellent activity for 4-nitrophenol (4-NP) reduction to the higher valued 4-aminophenol (4-AP) with the addition of NaBH solution, and remarkable activity for rhodamine B (RhB) degradation with the addition of the NaBH. Owing to the presence of the reactive oxygen species •OH, the oxidase-like activity of RuCo@NC is increased by 1.94 times that of bare Co@NC. RuCo@NC exhibits superior activity for the 4-NP reduction with a high turnover frequency (TOF) of 1.04×10 mmol mg min. Moreover, when RuCo@NC is employed for RhB degradation with NaBH, the efficiency of the system can reach 93.8 %.
{"title":"Rational design of Ruthenium/Cobalt nanoparticles embedded in nitrogen-doped carbon frameworks as a multifunctional nanozyme for dopamine detection and organic pollutant degradation","authors":"Tian Tian, Wanting Wang, Kexin Li, Yiping Wang, Wensheng Fu","doi":"10.1016/j.jallcom.2024.175429","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175429","url":null,"abstract":"Exploring efficient multi-functional catalysts with is critical for oxidase-like catalysis and environmental pollutant degradation. In this paper, we report a RuCo alloy embedded in a nitrogen-doped carbon matrix (RuCo@NC) derived from a Co-based metal-organic framework (ZIF-67). RuCo@NC exhibits highly efficient oxidase activity for dopamine (DA) detection, excellent activity for 4-nitrophenol (4-NP) reduction to the higher valued 4-aminophenol (4-AP) with the addition of NaBH solution, and remarkable activity for rhodamine B (RhB) degradation with the addition of the NaBH. Owing to the presence of the reactive oxygen species •OH, the oxidase-like activity of RuCo@NC is increased by 1.94 times that of bare Co@NC. RuCo@NC exhibits superior activity for the 4-NP reduction with a high turnover frequency (TOF) of 1.04×10 mmol mg min. Moreover, when RuCo@NC is employed for RhB degradation with NaBH, the efficiency of the system can reach 93.8 %.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545824","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 : 2024-07-02DOI: 10.1016/j.jallcom.2024.175431
J. Joseph, M. Annasamy, P.D. Hodgson, M.R. Barnett, D.M. Fabijanic
Using AlCoCrFeNi alloy as the reference composition, a novel NiAl(FeCoCr) eutectic high entropy alloy (EHEA) system is proposed. A strong linear relationship was established between the elemental combinations of Ni, Al and (Fe+Co+Cr)-content that evolves a similar volume fraction of B2 phase to the as-cast reference composition (volume fraction of B2 phase ∼34 %) using CALPHAD. For a fixed elemental combination of Ni and Al using the proposed criteria, the equi-atomic substitution of Co and Cr with Fe in the defined (Fe+Co+Cr)-content yields a similar as-cast phase structure to the reference composition (near the melting point such as 1300 C). From this large pool of alloy compositions, a few alloys with different elemental combinations (Fe-contents from 16.4 to 55 at%) were identified and prepared by arc melting. The as-cast EHEAs exhibited a similar lamellar microstructure and tensile properties (yield strength ∼570 MPa and ultimate strength of ∼1000 MPa) as the AlCoCrFeNi reference composition. It is thereby demonstrated that in alloys based on microstructure-driven mechanical performance, it is possible to substitute costly elements in EHEAs for lower cost Fe.
{"title":"Exploring the limits of Fe content in Al-Co-Cr-Fe-Ni-based eutectic high entropy alloys using CALPHAD-based alloy design","authors":"J. Joseph, M. Annasamy, P.D. Hodgson, M.R. Barnett, D.M. Fabijanic","doi":"10.1016/j.jallcom.2024.175431","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175431","url":null,"abstract":"Using AlCoCrFeNi alloy as the reference composition, a novel NiAl(FeCoCr) eutectic high entropy alloy (EHEA) system is proposed. A strong linear relationship was established between the elemental combinations of Ni, Al and (Fe+Co+Cr)-content that evolves a similar volume fraction of B2 phase to the as-cast reference composition (volume fraction of B2 phase ∼34 %) using CALPHAD. For a fixed elemental combination of Ni and Al using the proposed criteria, the equi-atomic substitution of Co and Cr with Fe in the defined (Fe+Co+Cr)-content yields a similar as-cast phase structure to the reference composition (near the melting point such as 1300 C). From this large pool of alloy compositions, a few alloys with different elemental combinations (Fe-contents from 16.4 to 55 at%) were identified and prepared by arc melting. The as-cast EHEAs exhibited a similar lamellar microstructure and tensile properties (yield strength ∼570 MPa and ultimate strength of ∼1000 MPa) as the AlCoCrFeNi reference composition. It is thereby demonstrated that in alloys based on microstructure-driven mechanical performance, it is possible to substitute costly elements in EHEAs for lower cost Fe.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545823","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 Ti-6Al-7 Nb alloy and its carbide possess a wide range of engineering applications, therefore, it is utmost required to fabricate high-quality carburized layers on the alloy surface. In this study, the carburization of Ti-6Al-7 Nb alloy was conducted using molten salts (including Carbon Nano Tubes, LiCl, KCl, and KF) in a planetary ball mill, followed by placement in an alumina tube furnace under a nitrogen atmosphere at 1050 °C for various durations. Several characterization techniques were employed to analyze the results, including X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The XRD results reveal that as the carburization duration increased, the alloy achieved complete carburization, forming a 120 µm thick layer of TiCN. After 24 h of carburization, the crystallite size of TiCN increased, and the micro-strain decreased, indicating improved structural quality. The morphology of the carburized layer at shorter durations exhibits micro-cracks and defects due to incomplete carburization, where carbon (C) and nitrogen (N) could not effectively occupy in the grain boundaries of alloy. After 24 h, an agglomerated, cauliflower-like layer of TiCN formed, enhancing the alloy's engineering properties. XPS confirmed the presence of carbon and nitrogen in the carburized sample, which contributed to the formation of the TiCN layer on the alloy surface. AFM analysis supported the SEM findings, revealing broad islands with microgrooves on the carburized layer. These features indicate a thick and well-formed carburized layer, confirming the successful carburization of Ti-6Al-7 Nb. Overall, the study demonstrates that a 24-h carburization process at 1050 °C in molten salts under a nitrogen atmosphere effectively produces a high-quality, thick, and adherent TiCN layer on Ti-6Al-7 Nb alloy, significantly enhancing its engineering properties.
Ti-6Al-7 Nb 合金及其碳化物具有广泛的工程应用，因此，在合金表面制造高质量的渗碳层是极为必要的。本研究在行星球磨机中使用熔盐（包括碳纳米管、氯化锂、氯化钾和 KF）对 Ti-6Al-7 Nb 合金进行渗碳处理，然后将其放入氮气环境下的氧化铝管式炉中，在 1050 °C 的温度下持续不同的时间。分析结果采用了多种表征技术，包括 X 射线衍射 (XRD)、场发射电子显微镜 (FE-SEM)、X 射线光电子能谱 (XPS) 和原子力显微镜 (AFM)。XRD 结果显示，随着渗碳时间的延长，合金实现了完全渗碳，形成了 120 µm 厚的 TiCN 层。渗碳 24 小时后，TiCN 的晶粒尺寸增大，微应变减小，表明结构质量得到改善。由于渗碳不完全，碳（C）和氮（N）不能有效地占据合金的晶界，渗碳层在较短时间内的形态表现出微裂纹和缺陷。24 小时后，TiCN 形成了团聚的菜花状层，增强了合金的工程特性。XPS 证实渗碳样品中存在碳和氮，这有助于在合金表面形成 TiCN 层。原子力显微镜（AFM）分析证实了扫描电子显微镜（SEM）的研究结果，在渗碳层上发现了带有微凹槽的宽岛。这些特征表明渗碳层很厚且形成良好，证实了 Ti-6Al-7 Nb 渗碳的成功。总之，该研究表明，在氮气环境下，在 1050 °C 的熔盐中进行 24 小时渗碳处理，可有效地在 Ti-6Al-7 Nb 合金上形成高质量、厚且附着力强的 TiCN 层，从而显著提高其工程特性。
{"title":"Carburization-induced surface modification of Ti-6Al-7Nb alloy and its characterization","authors":"Mohamed A. Ismail, Mahmood Anwar, Jitendra Kumar Singh, Han-Seung Lee, Yuena Meng, Chuying Kuang, Man Zhang, Qi Ning, Yifan Ding, Jiakai Zhang","doi":"10.1016/j.jallcom.2024.175436","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175436","url":null,"abstract":"The Ti-6Al-7 Nb alloy and its carbide possess a wide range of engineering applications, therefore, it is utmost required to fabricate high-quality carburized layers on the alloy surface. In this study, the carburization of Ti-6Al-7 Nb alloy was conducted using molten salts (including Carbon Nano Tubes, LiCl, KCl, and KF) in a planetary ball mill, followed by placement in an alumina tube furnace under a nitrogen atmosphere at 1050 °C for various durations. Several characterization techniques were employed to analyze the results, including X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The XRD results reveal that as the carburization duration increased, the alloy achieved complete carburization, forming a 120 µm thick layer of TiCN. After 24 h of carburization, the crystallite size of TiCN increased, and the micro-strain decreased, indicating improved structural quality. The morphology of the carburized layer at shorter durations exhibits micro-cracks and defects due to incomplete carburization, where carbon (C) and nitrogen (N) could not effectively occupy in the grain boundaries of alloy. After 24 h, an agglomerated, cauliflower-like layer of TiCN formed, enhancing the alloy's engineering properties. XPS confirmed the presence of carbon and nitrogen in the carburized sample, which contributed to the formation of the TiCN layer on the alloy surface. AFM analysis supported the SEM findings, revealing broad islands with microgrooves on the carburized layer. These features indicate a thick and well-formed carburized layer, confirming the successful carburization of Ti-6Al-7 Nb. Overall, the study demonstrates that a 24-h carburization process at 1050 °C in molten salts under a nitrogen atmosphere effectively produces a high-quality, thick, and adherent TiCN layer on Ti-6Al-7 Nb alloy, significantly enhancing its engineering properties.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545959","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 : 2024-07-02DOI: 10.1016/j.jallcom.2024.175410
Parisa Rezaei-Shahreza, Saeed Hasani, Amir Seifoddini, Marcin Nabiałek, Pawel Czaja
This research conducts a thorough investigation into the structural and mechanical evolution of FeBNbHfSi bulk metallic glass (BMG) subjected to thermal aging. Utilizing X-ray diffraction (XRD) and selected area electron diffraction (SAED), the study verifies the amorphous structure of the as-cast BMG, highlighting evidence of short-range ordering (SRO). Thermal aging conducted between 342 and 570 K induces substantial changes, notably the formation of FeB and α-Fe phases and reduced defect concentrations. During dynamic mechanical analysis, a significant shift was observed, which is characterized by a decrease in the intensity of β-relaxation and an increase in β-activation energy from 333.3±2.1 kJ/mol (for the sample aged at 342 K) to 384.6±5.6 kJ/mol (for the sample aged at 570 K). Nanoindentation evaluations reveal an increase in hardness from 11.85±0.22 GPa (for the as-cast BMG) to 14.65±0.41 GPa (for the sample aged at 570 K), accompanied by an increase in Young’s modulus from 211.61±3.00–244.24±2.00 GPa. These changes imply tighter atomic packing and diminished free volume due to aging, suggesting an advanced stage of structural relaxation. Additionally, the material demonstrates a decrease in plastic strain from 0.0052 in its as-cast state to 0.0026 at 342 K, progressing to brittle behavior with further aging. This study shows the pivotal role of precise aging temperature control in optimizing BMGs for diverse applications, illustrating the intricate interplay between thermodynamics and kinetics in material science.
本研究深入探究了受热老化的铁硼铪硅块状金属玻璃（BMG）的结构和机械演变。利用 X 射线衍射 (XRD) 和选区电子衍射 (SAED)，研究验证了铸件 BMG 的无定形结构，并突出了短程有序 (SRO) 的证据。在 342 至 570 K 之间进行的热老化引起了重大变化，特别是形成了 FeB 和 α-Fe 相，并降低了缺陷浓度。在动态机械分析过程中，观察到了明显的变化，其特征是 β 松弛强度降低，β 激活能量从 333.3±2.1 kJ/mol（342 K 老化的样品）增加到 384.6±5.6 kJ/mol（570 K 老化的样品）。纳米压痕评估显示硬度从 11.85±0.22 GPa（铸件 BMG）增加到 14.65±0.41 GPa（570 K 老化样品），同时杨氏模量从 211.61±3.00-244.24±2.00 GPa 增加。这些变化意味着老化导致原子堆积更紧密，自由体积减小，表明结构松弛已进入后期阶段。此外，该材料的塑性应变从铸造状态下的 0.0052 减小到 342 K 时的 0.0026，并随着进一步老化而发展为脆性行为。这项研究表明，精确的老化温度控制在优化 BMG 的各种应用中起着关键作用，说明了材料科学中热力学和动力学之间错综复杂的相互作用。
{"title":"Unraveling the complexity of Fe-based bulk metallic glasses: Insights into dynamic mechanical relaxation in atomic-scale","authors":"Parisa Rezaei-Shahreza, Saeed Hasani, Amir Seifoddini, Marcin Nabiałek, Pawel Czaja","doi":"10.1016/j.jallcom.2024.175410","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.175410","url":null,"abstract":"This research conducts a thorough investigation into the structural and mechanical evolution of FeBNbHfSi bulk metallic glass (BMG) subjected to thermal aging. Utilizing X-ray diffraction (XRD) and selected area electron diffraction (SAED), the study verifies the amorphous structure of the as-cast BMG, highlighting evidence of short-range ordering (SRO). Thermal aging conducted between 342 and 570 K induces substantial changes, notably the formation of FeB and α-Fe phases and reduced defect concentrations. During dynamic mechanical analysis, a significant shift was observed, which is characterized by a decrease in the intensity of β-relaxation and an increase in β-activation energy from 333.3±2.1 kJ/mol (for the sample aged at 342 K) to 384.6±5.6 kJ/mol (for the sample aged at 570 K). Nanoindentation evaluations reveal an increase in hardness from 11.85±0.22 GPa (for the as-cast BMG) to 14.65±0.41 GPa (for the sample aged at 570 K), accompanied by an increase in Young’s modulus from 211.61±3.00–244.24±2.00 GPa. These changes imply tighter atomic packing and diminished free volume due to aging, suggesting an advanced stage of structural relaxation. Additionally, the material demonstrates a decrease in plastic strain from 0.0052 in its as-cast state to 0.0026 at 342 K, progressing to brittle behavior with further aging. This study shows the pivotal role of precise aging temperature control in optimizing BMGs for diverse applications, illustrating the intricate interplay between thermodynamics and kinetics in material science.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141545926","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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