Journal of Alloys and Compounds最新文献

{"title":"Glassy disordered ground states in the frustrated pyrochlore and fluorite antiferromagnets NaCdM2F7 (M = Ni2+, Mn2+)","authors":"Andrej Kancko, Cinthia Antunes Corrêa, Ross Harvey Colman","doi":"10.1016/j.jallcom.2025.180142","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180142","url":null,"abstract":"We report the crystal structures, magnetic and thermodynamic properties of two magnetically frustrated <em>A</em>’<em>A</em>”<em>M</em>₂F₇ -type antiferromagnets, NaCdNi₂F₇ and NaCdMn₂F₇. While NaCdNi₂F₇ forms a stable pyrochlore structure (SG: <em>Fd-3m</em>, #227) with magnetic <em>S</em> = 1 Ni²⁺ ions on the frustrated pyrochlore 16<em>c</em> site and fully disordered non-magnetic Na⁺/Cd²⁺ ions on the pyrochlore 16<em>d</em> site, NaCdMn₂F₇ favors the <em>defect</em>-fluorite structure (SG: <em>Fm-3m</em>, #225) with magnetic <em>S</em> = 5/2 Mn²⁺ and non-magnetic Na⁺ and Cd²⁺ ions fully disordered on the fluorite 4<em>a</em> site. This is a result of the Mn²⁺ ionic radius being too close to the average Na⁺/Cd²⁺ ionic radius, hindering the cationic site ordering towards the stable pyrochlore structure. In both cases, dominant antiferromagnetic interactions θ_CW,Ni = -91.2(5) K and θ_CW,Mn = -42.4(4) K are noted, with no magnetic transition until <em>T</em>_f,Ni = 3.2<!-- --> <!-- -->K and <em>T</em>_f,Mn = 2.0<!-- --> <!-- -->K, implying substantial frustration, with frustration indices <em>f</em>_Ni = 28.5 and <em>f</em>_Mn = 21. AC susceptibility measurements and bifurcation of ZFC/FC low-field magnetization indicate a spin-glass-like ground-state, precipitated by the magnetic-bond-disorder stemming from the inherent structural disorder.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"107 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766494","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}

{"title":"Regulating catalytic activity with geometry distortion of Sr2FeMoO6 anode","authors":"Y.X. Tang, Q. Zhang, Y.M. Wang, X.L. Zhou, M. Zhang, R.H. Yuan, SH Gao, X Wang","doi":"10.1016/j.jallcom.2025.180113","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180113","url":null,"abstract":"The strong coupling between functional properties and geometry distortion is acknowledged as a distinctive feature of ABO₃ perovskite. In particular, defect chemistry has been suggested as a critical factor affecting electrochemical reaction. In order to unravel the microscopic link between geometry distortion and catalytic activity of perovskite electrode, the electrochemical performance of Sr₂(Fe_0.9V_0.1)MoO₆ (S(FV)M) and Sr₂Fe(Mo_0.9V_0.1)O₆ (SF(MV)) anodes is investigated in this work. From S(FV)M to SF(MV), FeO₆ octahedral evolves from being stretched to being compressed, while MoO₆ octahedral evolves from being flattened to being expanded. Accompanied with such distortion, S(FV)M anode holds much higher content of oxygen vacancy than SF(MV) anode. Consequently, S(FV)M anode exhibits rapid oxygen ion diffusion in EIS test. Besides, the higher conductivity of S(FV)M is also conducive to the charge-transport process. Thus, the electrochemical reactions on S(FV)M anode proceed rapidly and excellent performance is obtained. At 850 ℃, the maximum power densities of S(FV)M- and SF(MV)- based cell is 810<!-- --> <!-- -->mW·cm^-2 and 547<!-- --> <!-- -->mW·cm^-2 respectively, i.e. the difference attains ⁓ 32.4%. Above results demonstrate the critical role of geometry distortion on electrochemical activity of Sr₂FeMoO₆ electrode. The innovation of this work is that simple structural distortion is introduced by doping the same element into different sub - lattice, excluding the influence of other factors, such as different electronegativity, ionic radius or chemical character. What´s more, understanding the critical role of geometry distortion is beneficial to achieving the highly active and durable catalysts for SOFC.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"34 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766496","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}

{"title":"Rare earth-doped CuAl2O4 catalysts with superior catalytic performance for methanol steam reforming","authors":"Moyu Liao, Qiling Duan, Ruofei Xiang, Xinyu Tan, Zhongxu Dai, Hang Qin, Hanning Xiao","doi":"10.1016/j.jallcom.2025.180229","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180229","url":null,"abstract":"To develop efficient catalyst for methanol steam reforming, Ce, Pr, and La-doped CuAl₂O₄ spinel composite catalysts were prepared using a one-step sol-gel method. The impact of rare earth promoter on the physicochemical properties and catalytic performance of CuAl₂O₄ spinel was investigated through various characterizations. Results indicated that the three rare earth-doped CuAl₂O₄ spinels demonstrated higher activity than the undoped CuAl₂O₄ spinel. Among them, the La-doped CuAl₂O₄ spinel showed the highest methanol conversion and hydrogen production rate, the lowest CO selectivity, and the best long-term stability. The La-doped CuAl₂O₄ spinel possessed superior physicochemical characteristics, such as small grain size, uniform elemental distribution, low band-gap energy, appropriate reducibility, strong alkalinity, and favorable surface chemical state. The present work suggested La-promoted CuAl₂O₄ spinel as a efficient candidate for methanol steam reforming catalyst.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"62 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766492","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}

{"title":"Tunable electromagnetic characteristics of sandwich structural CoFe2O4/MoS2 composites with high microwave absorption performance","authors":"Shaoyang Pan, Xiaohui Liang, Wei Xiao, Kan Zhou, Shouyu Ren, Yuxin Jin, Changxi Peng, Zengming Man, Pengtao Cheng","doi":"10.1016/j.jallcom.2025.180224","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180224","url":null,"abstract":"Molybdenum disulfide (MoS₂) exhibit excellent electromagnetic wave loss characteristics and better microwave absorption ability due to its semiconductor properties, large specific surface area, and numerous defect sites. In this study, the interlayer spacing of MoS₂ was expanded by ion intercalation technology, in which the Fe³⁺ and Co²⁺ into the interlayer to form sandwich structural CoFe₂O₄/MoS₂ composites in-situ. The three-dimensional structure provides rich interfaces between CoFe₂O₄ and MoS₂, which enhanced its absorption performance. The CoFe₂O₄/MoS₂ composites (molar ratio 1:2) achieved a reflection loss (RL) value of -60.41<!-- --> <!-- -->dB at a thickness of 1.38<!-- --> <!-- -->mm, while CoFe₂O₄/MoS₂ composites (molar ratio 1:1) achieved a minimum reflection loss (RL_min) of -49.02<!-- --> <!-- -->dB and an effective absorption bandwidth (EAB) of 6.28<!-- --> <!-- -->GHz (11.72 to 18<!-- --> <!-- -->GHz) at a thickness of 1.79<!-- --> <!-- -->mm, covering the entire Ku band. The excellent absorption performance was attributed to the ion intercalation technology opening up the interlayer spacing of MoS₂, which increases the amount of Co and Fe ion insertion enhancing the interface effect of electromagnetic wave, thereby adjusting the electromagnetic parameters of the composite material and optimizing impedance matching.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"108 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143775799","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}

{"title":"Ultra-fast and high sensitivity of NO2 detection at room temperature and ultraviolet with a self-assembled ZnMnO/MXene-OH nanocompistie","authors":"Zhichao Yu, Jingfeng Wang, Wei Cao, Chang Luo, Shanshan Wang, Zhijun Ding, Lei Guo, Zhihong Qiao, Puhong Wang","doi":"10.1016/j.jallcom.2025.180170","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180170","url":null,"abstract":"Metal oxide semiconductor (MOS) gas sensor is an effective tool for NO₂ detection. In this work, a NO₂ sensor based on MXene-OH/ZnMnO was fabricated via a seed layer induced self-assembly method, exhibiting remarkable gas response value(280) to 100 ppm NO₂ under 25℃ and ultraviolet activation. Besides, the prepared sensor presents ultra-fast response and recovery speeds (8/40<!-- --> <!-- -->s), low detection limit (250 ppb), and high selectivity. The enhanced sensing performance was explained by the first-principles calculations, showing that the increased electrical conductivity, more electron transfer numbers and higher adsorption energy promotes effective transport of charge carriers on the surface of sensing materials and NO₂ gas molecules.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"22 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143775800","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}

{"title":"Assembly of 1D organic-inorganic hybrid based on new arsenomolybdate ligand of [AsMo10O35]7− for efficient electrochemical sensing of hydrogen peroxide","authors":"Qiao Gao, Xue-Rui Dong, Ling-Kun Meng, Zhe Lin, Tao Zhang, Lin Xu","doi":"10.1016/j.jallcom.2025.180223","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180223","url":null,"abstract":"The rational design of electrocatalytic materials based on polyoxometalates represents an intriguing strategy towards high-sensitivity electrochemical sensing of H₂O₂. A novel arsenomolybdate-based organic-inorganic hybrid, H₉(Him)₁₅[Mn(H₂O)₂][AsMo₁₀O₃₅]₂[Na(im)₂]₂[AsMo₁₀O₃₅]₂·34H₂O (<strong>1</strong>) (im = imidazole), was obtained via a stepwise synthetic strategy. Structural analysis revealed that hybrid <strong>1</strong> features a one-dimensional (1D) chain comprising of alternating {Mn(H₂O)₂} and {Na(im)₂} units linked to [AsMo₁₀O₃₅]^7- clusters. In addition, hybrid <strong>1</strong> was combined with carbon nanotubes (CNTs) to fabricate a 1@CNTs composite, which was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), infrared spectroscopy (IR), and electrochemical methods. Electrochemical studies reveal that hybrid <strong>1</strong> exhibited the multi-electron redox processes ascribed to Mo^VI centers, and had good electrocatalytic activity for H₂O₂ reduction. Due to the synergistic effect between hybrid <strong>1</strong> and CNTs, <strong>1</strong>@CNTs modified electrode exhibited excellent analytical performance for H₂O₂ detection, with a high sensitivity of 0.2028 μA·μM^-1, a low limit of detection of 1.47<!-- --> <!-- -->μM (S/N=3), as well as good anti-interference ability and stability. Furthermore, the <strong>1</strong>@CNTs-based sensor was employed to detect H₂O₂ in human urine samples with a recovery of 98.76%-100.17%, demonstrating its feasibility for practical applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"23 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766500","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}

{"title":"Effect of Zr on microstructure and mechanical properties of novel Al0.5Mo0.5NbTi1.25V0.5Zrx lightweight refractory high-entropy alloys","authors":"Yajing Li ,&nbsp;Jingming Yang ,&nbsp;Zhihao Yao ,&nbsp;Wenyuan Zhao ,&nbsp;Yingying Fu ,&nbsp;Ziqi Jin ,&nbsp;Jianxin Dong ,&nbsp;Lei Jin","doi":"10.1016/j.jallcom.2025.180085","DOIUrl":"10.1016/j.jallcom.2025.180085","url":null,"abstract":"<div><div>The advent of refractory high-entropy alloys has introduced creative ideas for advancing an additional category of high-temperature materials. Six alloys with differing Zr concentrations were examined to assess the influence of Zr on the lightweight refractory high-entropy alloys (HEAs) Al_0.5Mo_0.5NbTi_1.25V_0.5Zr_x. The findings revealed that the actual density of the HEA samples varied between 6.2 and 6.3<!--> <!-->g·cm⁻³. The microstructure of the synthesized HEAs consisted of a body-centered cubic (BCC) phase and the AlZr phase. As Zr content increased, the hardness of the Al_0.5Mo_0.5NbTi_1.25V_0.5Zr_x RHEAs rose from 364 HV to 482 HV and then steadied at 475 HV. At ambient temperature, the compressive strength and yield strength of the Al_0.5Mo_0.5NbTi_1.25V_0.5Zr_x RHEAs markedly improved with the incorporation of Zr. Excessive Zr, however, resulted in a decline in the plasticity of the alloys at ambient temperature. The Zr0.4 alloy demonstrates the worst compression characteristics at both ambient and high temperatures. Except for the Zr0.4 alloy, the yield strength of the Al_0.5Mo_0.5NbTi_1.25V_0.5Zr_x RHEAs exhibits an increasing and subsequently declining tendency with the addition of Zr at elevated temperatures, reaching a maximum at 0.7. The Zr0.7 alloy achieves an optimal equilibrium between elevated plasticity and high strength, exhibiting a 20% enhancement in strength at 800°C relative to comparable cast alloys.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1024 ","pages":"Article 180085"},"PeriodicalIF":5.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766499","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}

{"title":"Twinning behavior and texture evolution of pure titanium during corrugated-flat rolling under wide temperature range","authors":"Chengxun He, Zhixiong Zhang, Bolin Wang, Hui Zhang, Zhongkai Ren, Changjiang Zhang, Jinxiong Hou, Tao Wang","doi":"10.1016/j.jallcom.2025.180198","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180198","url":null,"abstract":"The twinning behavior and texture evolution of pure titanium during cryogenic/room temperature corrugated-flat rolling and subsequent flat rolling at room temperature were studied. The tensile strength of 815.8&lt;!-- --&gt; &lt;!-- --&gt;MPa, yield strength of 769.9&lt;!-- --&gt; &lt;!-- --&gt;MPa and elongation of 9.8% were obtained by cryogenic corrugated rolling and flat rolling at room temperature (refers to CRFR hereafter). Besides, the tensile strength of 798.0&lt;!-- --&gt; &lt;!-- --&gt;MPa, yield strength of 776.6&lt;!-- --&gt; &lt;!-- --&gt;MPa and elongation of 10.5% were obtained by room temperature corrugated rolling and flat rolling at room temperature (refers to RRFR hereafter). The large quantity of twins was activated in the cryogenic environment, which refined the grains size and enhanced the tensile strength. At the peak with 5% deformation, the activation of&lt;span&gt;&lt;span style=\"\"&gt;&lt;math&gt;&lt;mo is=\"true\" stretchy=\"false\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;11&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\" stretchy=\"false\"&gt;}&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt;&lt;span style=\"font-size: 90%; display: inline-block;\" tabindex=\"0\"&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mo stretchy=\"false\" is=\"true\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;11&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo stretchy=\"false\" is=\"true\"&gt;}&lt;/mo&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;compression twins and&lt;span&gt;&lt;span style=\"\"&gt;&lt;math&gt;&lt;mo is=\"true\" stretchy=\"false\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;11&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;4&lt;/mn&gt;&lt;mo is=\"true\" stretchy=\"false\"&gt;}&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt;&lt;span style=\"font-size: 90%; display: inline-block;\" tabindex=\"0\"&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mo stretchy=\"false\" is=\"true\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;11&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;4&lt;/mn&gt;&lt;mo stretchy=\"false\" is=\"true\"&gt;}&lt;/mo&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;compression twins under cryogenic corrugated rolling (CCR) deflected the grain orientations toward ND, forming&lt;span&gt;&lt;span style=\"\"&gt;&lt;math&gt;&lt;mo is=\"true\" stretchy=\"false\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;0001&lt;/mn&gt;&lt;mo is=\"true\" stretchy=\"false\"&gt;}&lt;/mo&gt;&lt;mo is=\"true\"&gt;&lt;&lt;/mo&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;0&lt;/mn&gt;&lt;mo is=\"true\"&gt;&gt;&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt;&lt;span style=\"font-size: 90%; display: inline-block;\" tabindex=\"0\"&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mo stretchy=\"false\" is=\"true\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;0001&lt;/mn&gt;&lt;mo stretchy=\"false\" is=\"true\"&gt;}&lt;/mo&gt;&lt;mo is=\"true\"&gt;&lt;&lt;/mo&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;0&lt;/mn&gt;&lt;mo is=\"true\"&gt;&gt;&lt;/mo&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;texture.&lt;span&gt;&lt;span style=\"\"&gt;&lt;math&gt;&lt;mo is=\"true\" stretchy=\"false\"&gt;{&lt;/mo&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\" stretchy=\"false\"&gt;","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"133 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766497","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}

{"title":"Halogen's Pivotal Influence on Modified BiOX (X = Cl, Br, I) in Visible-Light Induced Intercalation and Photocatalytic Reduction of Cr(VI): Unveiling the Mechanism and Structure-Activity Relationship","authors":"Yueyang Li, Tianye Wang, Mingtang Li, Ningning Song","doi":"10.1016/j.jallcom.2025.180164","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180164","url":null,"abstract":"The structural configuration of bismuth oxyhalides (X= Cl, Br, I) confers upon them a versatile reaction mechanism for the remediation of Cr(VI) in aqueous environments under visible light. This study aimed to delineate the correlation between structural variations attributable to different halogens and the efficacy in Cr(VI) treatment. To this end, BiOX materials characterized by bismuth vacancies and exposed (110) facets were synthesized using a one-step self-assembly process. The regulation of crystal facets and vacancies exposes more interlayer channels, facilitates carrier transport, alters the interlayer distance, and modifies the band structure. Consequently, these changes promote the removal of Cr(VI) through two primary mechanisms: interlayer adsorption and photocatalytic reduction. Results showed that as the atomic number of the halogen increased, the light induced reduction capability for Cr(VI) enhanced, whereas the interlayer adsorption performance of Cr(VI) showed an inverse relationship. The halogen determines the structural performance differences among BiOX materials. Through the study of various reaction mechanisms, it was found that electronegativity, bandgap energy, valence band energy, and resistivity are negatively correlated with the reduction rate under visible light. In contrast, the adsorption rate under visible light is positively correlated with these factors, but negatively correlated with the diagonal distance of the halogens. This study provides a theoretical basis for the material design of bio-oxides and their environmental applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"10 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758236","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}

{"title":"Efficient improvement strategy for supported iridium-based catalysts in pure water electrolysis","authors":"Xinlei Wang ,&nbsp;Yuzhuo Zhang ,&nbsp;Yujie Shen ,&nbsp;Jun Liu ,&nbsp;Haimin Zhang","doi":"10.1016/j.jallcom.2025.180071","DOIUrl":"10.1016/j.jallcom.2025.180071","url":null,"abstract":"<div><div>In this study, carbon black and TiO₂ were selected as support materials for loading iridium-based nanoparticles (Ir NPs), which were subsequently employed in OER electrocatalysis and PEM water electrolysis. The resulting 60 wt% Ir/C and 60 wt% Ir/TiO₂ catalysts exhibited Ir NPs with a close average size of 1.6 nm, which uniformly covered the surfaces of carbon black and TiO₂. In RDE measurements, 60 wt% Ir/C and 60 wt% Ir/TiO₂ show the same overpotential (249 mV at 10 mA/cm²), as well as similar Tafel slopes, suggesting that the two catalysts have comparable catalytic activity and reaction kinetics. In the single cell testing, the electrocatalytic activity is closely related to the Ir loading and catalytic layer thickness in the membrane electrode assembly (MEA). With an optimized Ir loading of 0.5 mg_Ir/cm², both 60 wt% Ir/C and 60 wt% Ir/TiO₂ display excellent catalytic activity (&lt;1.65–1.7 V@1 A/cm²; 1.81–1.89 V@2 A/cm²) and good stability in 550 h without evident degradation. It’s worth noting that 60 wt% Ir/C demonstrate better durability than 60 wt% Ir/TiO₂ at higher current density of 1.5 A/cm² and 2.0 A/cm². However, the durability of 30 wt% Ir/C in MEA testing is much worse, which indicates that a fully covered surface by Ir NPs is an effective way for enhancing the stability of supported iridium-based catalysts.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1023 ","pages":"Article 180071"},"PeriodicalIF":5.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758669","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}