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设计低廉、高效且长稳定的析氢反应(HER)催化剂对于水分解技术的工业实施至关重要。本研究采用溶胶凝胶法结合后续热分解的方式制备出了异质纳米结构NiO/KNbO3催化剂，通过X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和电化学工作站(CHI660E)对NiO/KNbO3催化剂的晶型结构、元素价态、微观形貌和HER催化性能进行了系统分析。结果表明，NiO/KNbO3催化剂在1 mol/L KOH电解液中表现出优异的HER催化性能，-10 mA/cm2电流密度下的析氢反应过电位仅为-217 mV,对应Tafel斜率为77.4 mV/dec,在24 h恒电位析氢反应稳定性测试中，表现出良好的催化稳定性和耐腐蚀性。NiO/KNbO3催化剂优异的HER性能归因于NiO和KNbO3的协同作用以及独特的异质纳米复合结构增大了活性位点暴露和改善了离子传输路径。
Abstract：The design of low-cost, efficient and long-term stable catalysts for hydrogen evolution reaction(HER) is crucially important for the industrial implementation of water-splitting technology.In this study, a NiO/KNbO3 catalyst with heterogeneous nanostructures was prepared using a sol-gel method combined with subsequent thermal decomposition.The crystal structure, valence state of the elements, micromorphology, and HER catalytic performance of the catalyst were systematically analyzed using X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and an electrochemical workstation(CHI660E).The results showed that the catalyst exhibited excellent HER catalytic performance in a 1 mol/L KOH electrolyte, with an overpotential of only-217 mV at a current density of-10 mA/cm2,corresponding to a Tafel slope of 77.4 mV/dec.Moreover, the catalyst demonstrated good catalytic stability and corrosion resistance in a 24-hour constant potential HER stability test.The excellent catalytic performance for HER of NiO/KNbO3 catalyst was ascribed to the synergistic effect of NiO and KNbO3,as well as the unique heterogeneous nanocomposite structure, which increased the exposure of active sites and improved the ion transport pathways.
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基本信息:
中图分类号:O643.36;TQ116.2
引用信息:
[1]张京京,陈静雯,陈亚辉,等.异质纳米结构NiO/KNbO_3增强析氢催化反应[J].塔里木大学学报,2024,36(01):28-36.
基金信息:
塔里木大学校长基金硕士项目(TDZKSS202230)
2024-03-15
2024-03-15