Wenli Kang, Haoran Guo, Zhouhang Li, Hua Wang, Tao Zhu, Xing Zhu, Kongzhai Li, Zhishan Li
{"title":"Enhanced oxygen evolution on A-site defect perovskite oxide through interfacial engineering","authors":"Wenli Kang, Haoran Guo, Zhouhang Li, Hua Wang, Tao Zhu, Xing Zhu, Kongzhai Li, Zhishan Li","doi":"10.1016/j.apsusc.2024.161274","DOIUrl":null,"url":null,"abstract":"Perovskite oxides are emerging as promising alternative to precious metal-based electrocatalysts for oxygen evolution reactions. Despite their potential, their catalytic activity is often insufficient for practical applications. In this study, we demonstrate that introducing A-site defects in LaNiO<ce:inf loc=\"post\">3</ce:inf> perovskite oxides promotes B-site exsolution during the reduction process. Subsequent chemical vapor deposition introduces selenium, forming an electrocatalyst with a heterojunction structure. Comprehensive characterization and electrochemical testing reveal that the r-La<ce:inf loc=\"post\">0.9</ce:inf>NiO<ce:inf loc=\"post\">3</ce:inf>/NiSe<ce:inf loc=\"post\">x</ce:inf> heterojunction structure, resulting from B-site exsolution induced by A-site defects, significantly enhances the electrocatalytic performance of the La<ce:inf loc=\"post\">0.9</ce:inf>NiO<ce:inf loc=\"post\">3</ce:inf> electrocatalyst. This novel structure not only increases oxygen vacancy concentration but also improves the wettability of the electrocatalyst, as indicated by a reduced bubble contact angle in water. These modifications lead to a notable improvement in the electrochemical performance of the r-La<ce:inf loc=\"post\">0.9</ce:inf>NiO<ce:inf loc=\"post\">3</ce:inf>/NiSe<ce:inf loc=\"post\">x</ce:inf> electrocatalyst. At a current density of 10 mA·cm<ce:sup loc=\"post\">−2</ce:sup>, the electrocatalyst exhibits an overpotential of 297.6 mV, with substantially increased mass activity. This study presents a novel approach to catalyst design in electrocatalysis, leveraging A-site defect induced B-site exsolution in perovskite oxides. The strategy of reduction followed by doping offers a robust framework for developing more efficient electrocatalysts, paving the way for advancements in the field of heterogeneous catalysis.","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":null,"pages":null},"PeriodicalIF":6.3000,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Surface Science","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.apsusc.2024.161274","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Perovskite oxides are emerging as promising alternative to precious metal-based electrocatalysts for oxygen evolution reactions. Despite their potential, their catalytic activity is often insufficient for practical applications. In this study, we demonstrate that introducing A-site defects in LaNiO3 perovskite oxides promotes B-site exsolution during the reduction process. Subsequent chemical vapor deposition introduces selenium, forming an electrocatalyst with a heterojunction structure. Comprehensive characterization and electrochemical testing reveal that the r-La0.9NiO3/NiSex heterojunction structure, resulting from B-site exsolution induced by A-site defects, significantly enhances the electrocatalytic performance of the La0.9NiO3 electrocatalyst. This novel structure not only increases oxygen vacancy concentration but also improves the wettability of the electrocatalyst, as indicated by a reduced bubble contact angle in water. These modifications lead to a notable improvement in the electrochemical performance of the r-La0.9NiO3/NiSex electrocatalyst. At a current density of 10 mA·cm−2, the electrocatalyst exhibits an overpotential of 297.6 mV, with substantially increased mass activity. This study presents a novel approach to catalyst design in electrocatalysis, leveraging A-site defect induced B-site exsolution in perovskite oxides. The strategy of reduction followed by doping offers a robust framework for developing more efficient electrocatalysts, paving the way for advancements in the field of heterogeneous catalysis.
期刊介绍:
Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.