in-situ XAS study of NiFeX-LDH (X = Cr, Mo, V, Nb) catalysts during the oxygen evolution reaction in alkaline media

It is planned to investigate NiFe- and NiFeX (X = Cr, Mo, V, Nb) layered double hydroxides during electrochemical OER conditions. By application of in-situ X-Ray absorption (XAS) spectroscopy we hope to elucidate the electronic state and structure (XANES) of the catalyst materials. EXAFS will be used to compare interatomic distances (M-M, M-O) in the host structure (NiFe-LDH) with those in the NiFeX-LDHs, thus giving insight into the local structure of the catalyst and the influence of the guest species on the host.

本研究拟针对电化学析氧反应（oxygen evolution reaction, OER）条件下的镍铁基（NiFe）及镍铁X（X=铬Cr、钼Mo、钒V、铌Nb）层状双氢氧化物（layered double hydroxides, LDH）开展探究。通过应用原位X射线吸收光谱（X-ray absorption spectroscopy, XAS），本研究旨在阐明该催化剂材料的电子状态与结构特征，相关分析将依托X射线吸收近边结构（X-ray absorption near edge structure, XANES）完成。本研究将采用扩展X射线吸收精细结构（extended X-ray absorption fine structure, EXAFS），对比主体结构镍铁基层状双氢氧化物（NiFe-LDH）与各镍铁X-层状双氢氧化物（NiFeX-LDHs）中的原子间距离（金属-金属、金属-氧），进而揭示该催化剂的局部结构，以及客体掺杂物种对主体结构的影响。