Journal of Alloys and Compounds最新文献

{"title":"Layered Ti3C2Tx MXene heterostructured with V2O5 nanoparticles for enhanced room temperature ammonia sensing","authors":"Jiran Liang, Yu Han, Hao Chen, Yixuan Zhang, Xiaoping Gao","doi":"10.1016/j.jallcom.2024.177798","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177798","url":null,"abstract":"To enhance ammonia sensing at room temperature (25°C), Two-dimensional transition metal carbonyl nitride (Ti₃C₂T_x MXene) modified by vanadium pentoxide nanoparticle (V₂O₅) is synthesized by hydrothermal method. The effects of weight ratio on the microstructure and ammonia sensing performance at room temperature are studied. The results indicate that when the weight percentage of V₂O₅ is 25%, V₂O₅ nanoparticles with an average size of 90.33<!-- --> <!-- -->nm are produced on the surface and between the layers of the two-dimensional MXene. The prepared MXene/V₂O₅ composites sensor has a good response (12.12) to 10 ppm NH₃. The enhanced sensing performance can be attributed to the modification of V₂O₅ nanoparticles as well as the catalytic effect and the formation of heterojunction. The doped V₂O₅ nanoparticles open up the unstratified portion of MXene and catalyze the chemisorption of oxygen and oxidation of NH₃. The difference in Fermi level between two-dimensional MXene and V₂O₅ drives the charge transfer at the heterojunction interface, enriching the electrons on the surface of V₂O₅, thus improving the sensitivity. Density functional theory suggests that the composite adsorption system is more stable and has lower NH₃ adsorption energy. This work provides a feasible route to develop high-performance gas sensors with MXene-based composites.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"53 Suppl 1 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142735853","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":"Construction of LSPR enhanced Ag/Cu2O/CuO Z-scheme heterojunction films and their superior photocatalytic redox activity","authors":"Mengran Zhu, Liang Hao, Qian Zhao, Te Hu, Sujun Guan, Yun Lu","doi":"10.1016/j.jallcom.2024.177822","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177822","url":null,"abstract":"Traditional methods, including wet chemistry, annealing, and photoreduction, were employed to prepare Ag/Cu₂O/CuO composite films. Analysis indicates that the Cu₂O/CuO heterojunction films were formed after wet chemical treatment and annealing. After the photoreduction reaction, Ag⁰ nanoparticles and nanosheets modified the Cu₂O/CuO heterojunction films at the nano and micro scales. The Ag modification not only enhanced the absorption of solar light of the heterojunction but also improved the transfer and separation of photogenerated electrons within the heterojunction, primarily attributed to the localized surface plasmon resonance (LSPR) effect of elemental silver. Compared to Cu₂O/CuO films, the performance of Ag/Cu₂O/CuO films in the photocatalytic degradation of MB increased by up to two times, while the performance in the photocatalytic reduction of Cr⁶⁺ improved by up to 2.56 times. Through the analysis of the charge transfer pathways of photogenerated electrons and holes within this system, we propose that the heterojunction formed between Cu₂O and CuO is of the Z-type. This study will provide valuable guidance for the design of highly efficient copper-based photocatalysts.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"258 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142735860","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":"Synthesis and visible-light photocatalytic performance of Ce-BiVO4/SrTiO3 Z-scheme heterojunction for H2 production and organic pollutant degradation","authors":"Qin Zhou, Wenyu Ren, Yangyang Wang, Wentao Zhang, Peicong Zhang, Yi Huang","doi":"10.1016/j.jallcom.2024.177817","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177817","url":null,"abstract":"Ce-BiVO₄/SrTiO₃ (Ce-BVO/STO) Z-scheme heterojunction composites were synthesized through a hydrothermal method to address the dual challenges of the energy crisis and water pollution. The influences of Ce³⁺ doping in Ce-BVO and the composition ratio of Ce-BVO/STO on the photocatalytic degradation of methylene blue (MB) and water splitting for H₂ production were systematically investigated. Notably, the Ce-BVO/STO-1/1 composite exhibited an H₂ production capacity as high as 771.3 μmol/g under visible light irradiation for 5<!-- --> <!-- -->h. Additionally, 96.65% of MB (10<!-- --> <!-- -->mg/L) was photodegraded under visible light within 150<!-- --> <!-- -->min. Furthermore, after three cycles, the Ce-BVO/STO-1/1 composite maintained a stable H₂ production yield and MB removal rate, demonstrating its high recyclability for practical application. The Z-scheme heterojunction structure effectively promoted the separation and redox reactions of photogenerated electrons (e^-) and holes (h⁺), and the photoelectrochemical reaction mechanism responsible for the enhanced photocatalytic performance was verified. These findings indicate that the as-prepared Ce-BVO/STO-1/1 composite has significant potential for application in H₂ production and pollutant degradation through visible-light-driven photocatalysis.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"36 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142735848","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":"Recent machine learning-driven investigations into high entropy alloys: a comprehensive review","authors":"Yonggang Yan, Xunxiang Hu, Yalin Liao, Yanyao Zhou, Wenhao He, Ting Zhou","doi":"10.1016/j.jallcom.2024.177823","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177823","url":null,"abstract":"The exploration of high entropy alloys (HEAs) primarily relies on trial-and-error experiments and multiscale modelling, which are time-consuming and resource-intensive. Recently, machine learning (ML) has emerged as a powerful tool for studying HEAs by training models and identifying key features. This review summarizes the recent progress in applying ML methods to HEAs, with a particular emphasis on properties relevant to structural materials. First, we outline the general process of utilizing ML methods in materials science. We then systematically review recent applications of ML in design of HEAs, focusing specifically on phase formation, structural properties, and constructing interatomic potentials. Finally, we highlight significant challenges and future research directions for ML methods in HEAs, offering insights into ongoing exploration and development.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"25 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142735850","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":"Confining silicon nanoparticles into porous-tight dual carbon layers for lithium-ion batteries","authors":"Chao Liang, Qiuyan Chen, Jinwei Chen, Jie Zhang, Gang Wang, Ruilin Wang","doi":"10.1016/j.jallcom.2024.177777","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177777","url":null,"abstract":"Porous silicon-carbon composite is considered as one of the most popular approaches to replace traditional graphite for high-energy lithium-ion batteries (LIBs). However, the introduction of carbon and pores usually involves complicated and environmentally unfriendly processes like etching, salt washing and metallothermic reduction. Here, we reported a facial way to fabricate a porosity-compactness dual-layers silicon-carbon composite by liquid phase solidification and carbonization. The inner citric acid constructs a porous carbon layer to provide extra space to accommodate volume expansion and facilitate electron and ion transform, and the outer pitch forms tough and compact carbon layer to stable the overall structure and to protect Si particles from electrolyte, thus improving the stability in the long run and guaranteeing initial coulombic efficiency (ICE) simultaneously. The as prepared electrode exhibited a gratifying cycling performance and a good ICE (79.4%), and the capacity retention is up to 86.9% after 100 cycles at 0.5<!-- --> <!-- -->A<!-- --> <!-- -->g^-1. The capacity can still maintain 538.1<!-- --> <!-- -->mA<!-- --> <!-- -->h g^-1 at 2<!-- --> <!-- -->A<!-- --> <!-- -->g^-1, and this structure greatly facilitate charge transport and Li-ion transform (1.3×10^-19 cm² s^-1). This facial preparation process of porous silicon-carbon anodes may pave the way for the potential practical application in high energy LIBs.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"186 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142735792","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 phase change, particle size and annealing in reducing and oxidizing atmospheres on UV-dosimetry characteristics of SrAl2O4:Eu using mechanoluminescence technique","authors":"Aditya Sahare, P D Sahare, Lucky Sharma, Hsin-Lung Chen","doi":"10.1016/j.jallcom.2024.177830","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177830","url":null,"abstract":"SrAl&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;:Eu is a known ML phosphor. The material was successfully synthesized using combustion method, downsized to different particle-size ranges (from microcrystalline to nanocrystalline sizes) through ball milling. It was further annealed at different high temperatures (200–800&lt;!-- --&gt; &lt;sup&gt;o&lt;/sup&gt;C) and characterized by XRD and FESEM. Reorganization of the material from SrAl&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; (monoclinic, space group P2&lt;sub&gt;1&lt;/sub&gt;/c) to Sr&lt;sub&gt;2&lt;/sub&gt;Al&lt;sub&gt;6&lt;/sub&gt;O&lt;sub&gt;11&lt;/sub&gt; (orthorhombic, space group Pnnm) plus SrO (cubic, space group Fm&lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;&amp;#x305;&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.317ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -896.2 500.5 997.6\" width=\"1.162ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-33\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(29,188)\"&gt;&lt;text font-family=\"STIXGeneral,'Arial Unicode MS',serif\" stroke=\"none\" transform=\"scale(55.199) matrix(1 0 0 -1 0 0)\"&gt;̅&lt;/text&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;̅&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;̅&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;m) phases on annealing above 800&lt;!-- --&gt; &lt;sup&gt;o&lt;/sup&gt;C was observed. ML studies show that the electron traps lost during mechanical/thermal stimulation could be regenerated by UV-irradiation. This property of the material was explored here to estimate the doses of UV radiations (UV-A, B and C). Also, dose responses of the materials having different particle size ranges from microcrystalline to nanocrystalline sizes were studied and found that the dose ranges get widened with the particle size decreasing with little sacrifice of the sensitivity. Thus, very high doses of the UV-radiation could also be estimated using ML nanophosphors. Fading at room temperature was little high but remaining ML is good enough for the dosimetry purpose. To the best of our knowledge such kind of detailed study on dosimetry of UV-radiations using ML technique is not found in the literature. It was also found that this material did not yield any ML after annealing the material above 800&lt;!-- --&gt; &lt;sup&gt;o&lt;/sup&gt;C and even after UV-irradiation. It was further explored by annealing the material in reducing and oxidizing atmospheres that whether","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"258 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142735797","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":"Magnetic response and hardness enhancement by spontaneous directional coarsening of Fe2AlB2 in quasicrystal-rich matrix","authors":"Piotr Józef Bardziński, Marek Weselski, Paul D. Asimow, Jinping Hu, Roger Rennan Fu","doi":"10.1016/j.jallcom.2024.177791","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177791","url":null,"abstract":"This study investigates the Al₅₅Cu₂₀Fe₁₅B₁₀ alloy system to understand the characteristics of the Fe₂AlB₂ (Cmmm) phase and its interactions with a quasicrystal-rich matrix. The alloy’s composition was chosen for its boron content, which promotes the formation of well-defined Fe₂AlB₂ crystals. We examined how different heat treatments affect the alloy’s microstructure, magnetic properties and hardness.Microstructural and Electron Backscatter Diffraction analyses revealed the stable icosahedral Al₅₉Cu₂₇Fe₁₂B₂ quasicrystalline phase and a metastable Al₇₀Fe₂₀Cu₁₀ approximant that is isostructural with C2/m Fe₄Al₁₃. Additionally, the alloy contained Al-Cu phases known from meteorites, such as AlCu stolperite and Al₂Cu khatyrkite.Heat treatments at 706^∘C and 828^∘C yielded favorable microstructure for ballistic armor, characterized by Fe₂AlB₂ lamellae embedded within the quasicrystalline matrix, reinforced by AlB₂ precipitation on the grain boundaries. Vickers hardness improvements were attributed to Hall-Petch strengthening and grain orientation effects. Notably, annealing at 943^∘C nearly tripled the magnetic entropy change. Quantum Diamond Microscopy confirmed that Fe₂AlB₂ significantly contributed to magnetization. The improvement of magnetic properties was found to be due to preferential orientation of Fe₂AlB₂ grains along the [010] zone axis, as a consequence of directional coarsening induced by annealing. The enhanced magnetocaloric properties observed at 943^∘C are primarily due to intrinsic changes in the Fe₂AlB₂ phase rather than strain relaxation or phase contributions from the quasicrystalline matrix.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"249 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142735790","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":"Grain size dependence of deformation behavior in Ti–15Mo alloy prepared by powder metallurgy","authors":"Chenyang Wu, Xiaoli Zhao, Takayoshi Nakano, Mitsuo Niinomi, Nan Jia, Deliang Zhang","doi":"10.1016/j.jallcom.2024.177825","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177825","url":null,"abstract":"To the best of our knowledge, this is the first report demonstrating grain refinement to 4 μm via a mass-production method for the Ti–15Mo alloy. Grain sizes ranging from 4 to 38 μm were achieved by controlling thermomechanical processing in powder metallurgy, combined with heat treatment using recycled coarse powders for additive manufacturing. The critical grain size for deformation twinning was investigated, alongside an analysis of the deformation behavior and mechanical properties of the Ti–15Mo alloy with various grain sizes. Upon refining the grain size to 7 μm, deformation twinning is inhibited, shifting the plastic deformation mechanism from mechanical twinning to dislocation slip. The yield strength can be adjusted between 921 and 715<!-- --> <!-- -->MPa, with elongation ranging from 18.4% to 34.4%, by varying the grain size distribution ratio of small to large grains relative to 7 μm from 1.5 to 0.42. This strengthening effect primarily arises from dislocation strengthening, Mo solid solution, texture strengthening, and modifications in the Hall-Petch constant due to changes in deformation behavior during grain refinement.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"72 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142735852","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":"Eu3+- activated Sr2GdF7 colloid and nano-powder for horticulture LED applications","authors":"Bojana Milićević, Aleksandar Ćirić, Zoran Ristić, Mina Medić, Abdullah N. Alodhayb, Ivana Radosavljević Evans, Željka Antić, Miroslav D. Dramićanin","doi":"10.1016/j.jallcom.2024.177820","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177820","url":null,"abstract":"A series of multifunctional Sr₂Gd_1-<em>x</em>Eu_<em>x</em>F₇ (<em>x</em> = 0, 0.05, 0.10, 0.40, 0.60. 0.80, and 1.00) phosphors in stable colloidal form and as nanopowders have been prepared using a hydrothermal method. Powder X-ray diffraction analysis confirmed that the materials crystallize in a cubic crystal structure. Transmission electron microscopy shows quasi-spherical nanoparticles with an average particle size of ~24<!-- --> <!-- -->nm. Photoluminescence measurements show highly efficient red emission in both colloids and nanopowders, with intensity continually increasing up to 80<!-- --> <!-- -->mol% of Eu³⁺ content without concentration quenching. The most prominent emission peaks are around 600<!-- --> <!-- -->nm (orange/red) and 700<!-- --> <!-- -->nm (deep red), with the latter more pronounced. Quantum efficiency follows a similar trend, and reaches 60% for the sample with 80<!-- --> <!-- -->mol% of Eu³⁺ content. In addition, similar asymmetry ratio values and CIE coordinates show that there is not a big change in the local symmetry around Eu³⁺ ions or emission color across the series. This confirms that Eu³⁺ resides in the same crystalline environment in samples. The observed ⁵D₀-level lifetimes gradually decrease from 12.0 ms to 6.9 ms as the Eu³⁺ concentration increases. Judd-Ofelt parameters show slight variation with Eu³⁺ concentration with Ω₄ always larger than Ω₂. The temperature-dependent steady-state and time-resolved photoluminescence measurements demonstrate high stability of nanopowders’ emission up to 100 °C. The combination of temperature stability and high efficiency of emission, as well as the untypical dominant deep-red emission at 700<!-- --> <!-- -->nm labels these nanoparticles as potential nanophosphors for various applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"186 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142735801","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":"Oxygen vacancy induced A-site ordering of a superior perovskite ferrite anode for solid oxide fuel cells","authors":"Peng Su, Jie Shan, Fang Wang, Yu Shen, Jingwei Li","doi":"10.1016/j.jallcom.2024.177827","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177827","url":null,"abstract":"Introducing pentavalent niobium stabilizes perovskite lattice of ferrites but reduces oxygen vacancy content. While oxygen vacancies are beneficial for gas adsorption, ion diffusion, and catalytic activity in perovskites, this trade-off is a challenge. Herein, by adjusting A-site rare earth/alkaline earth ratio, we synthesize ABO₃-structured perovskite oxides Pr_0.75Sr_0.25Fe_0.875Nb_0.125O_3-δ (PSFN6271) and Pr_0.5Sr_0.5Fe_0.875Nb_0.125O_3-δ (PSFN4471) and evaluate their electrochemical performance as anodes for solid oxide fuel cells. PSFN4471 undergoes phase transition in reducing environment, from orthorhombic simple perovskite to tetragonal A-site ordered layered perovskite PrSrFe_1.75Nb_0.25O_6-δ (L-PSFN4471), with the exsolution of Fe⁰ nanoparticles. High performance, superior coking and sulfur tolerance are demonstrated for L-PSFN4471 anode. We reveal that oxygen vacancy formation is the driven force for the A-site ordering of PSFN4471 and study the differences between PSFN6271 and PSFN4471 in physiochemical properties and electrochemical performance. We demonstrate that the L-PSFN4471 is a high-performance and promising SOFC alternative anode with considerable coking and sulfur poisoning resistance.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"5 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142735857","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}