氧化银电催化水解中异常表面重构现象  

Anomalous surface reconstruction of silver oxide during electrochemical overall water splitting

作　　者：张旗[1] 郇美慧 孙可心 张智博 赵佳丽 明硕阳 宋瑶 陈霆 郎集会[1] ZHANG Qi;HUAN Mei-hui;SUN Ke-xin;ZHANG Zhi-bo;ZHAO Jia-li;MING Shuo-yang;SONG Yao;CHEN Ting;LANG Ji-hui(College of Physics,Jilin Normal University,Siping 136000,China)

机构地区：[1]吉林师范大学物理学院,吉林四平136000

出　　处：《吉林师范大学学报（自然科学版）》2023年第4期23-35,共13页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(22078124,21878119);吉林省教育厅科学技术研究项目(JJKH20191005KJ)。

摘　　要：在泡沫镍(NF)衬底上制备了Ag_(x)O_(y)晶体材料,研究发现其不仅在析氧反应(OER)过程中会经历重构过程,析氢反应(HER)过程中亦表现出显著的重构现象.尽管X射线衍射谱(XRD)证实经过HER/OER后的样品的主要成分相同,但X射线光电子能谱(XPS)证实各电极表面非金属元素的化学环境存在较大变化.依据HER/OER过程中的局域电化学特征,分析了样品形貌重构产生的原因.本文对加深认识催化剂前驱体的内涵,以及材料表面结构在电化学反应过程中的结构演化动力学及其机制的研究具有重要的指导意义.The silver oxides(Ag_(x)O_(y))were prepared by hydrothermal method and then followed air annealing on a Ni Foam substrate.Electrochemical(EC)measurements confirm that Ag x O y not only undergo a reconstruction process during oxygen precipitation reaction(OER),but also exhibit a significant reconstruction phenomenon after hydrogen evolution reaction(HER).Moreover,the morphology of the products is not only very different from each other,but also completely different from the pristine one.X-ray photoelectron spectroscopy(XPS)also confirms the change of chemical environments for the non-metallic element on electrode surfaces,although the main compositions are the same as the pristine material and derivatives confirmed by X-ray Diffraction(XRD).The different morphologies of each electrode before and after HER/OER reconstruction can be interpreted based on the characteristics of the local electrochemical environment adjacent to the surfaces of electrode.The present paper is an important guide to deepen the understanding of the pre-catalyst,as well as to study the kinetics of structural evolution of the material and the mechanism involved during the EC reaction processes.

关 键 词：析氢反应 析氧反应 表面重构 局域电场驱动 

分 类 号：TK518[动力工程及工程热物理—热能工程] TN304[电子电信—物理电子学]