Ag_(2)Se/CoSe_(2)复合材料的制备及其电催化析氧性能研究  

Synthesis of Ag_(2)Se/CoSe_(2)composites and its electrocatalytic oxygen evolution properties

作　　者：吴余凡 李威威 郭明亮 涂进春[1] 丁雷[1] WU Yu-fan;LI Wei-wei;GUO Ming-liang;TU Jin-chun;DING Lei(School of Materials Science and Engineering,Hainan University,State Key Laboratory of MarineResource Utilization in South China Sea,Haikou 570228,China)

机构地区：[1]海南大学材料科学与工程学院,南海海洋资源利用国家重点实验室,海南海口570228

出　　处：《化学研究与应用》2023年第5期1204-1209,共6页Chemical Research and Application

基　　金：海南省自然科学基金项目(2019RC027)资助。

摘　　要：析氧反应(OER)是电化学分解水中的一个阳极半反应,其动力学缓慢,极大地限制了电化学分解水制氢的能量效率。在本工作中,我们通过一锅水热法,简便地制备了Ag_(2)Se/CoSe_(2)系列复合材料催化剂并将其用于高效电催化析氧反应。其中,最优比例的Ag_(2)Se/CoSe_(2)-3复合催化剂在电流密度为10 mA/cm^(2)时表现出了220 mV的低过电势,提高了电催化析氧反应动力学。扫描电子显微镜的结果表明,Ag_(2)Se/CoSe_(2)复合催化剂具有分级多孔结构的微球形貌,该结构暴露了大量的活性位点并且有利于质量传输。X-射线光电子能谱分析表明,Ag_(2)Se的引入调控了CoSe_(2)的电子结构,促进了Co的价态进一步提高,从而提高了原有催化活性位点的本征活性,明显降低了OER反应的过电势。本工作将对开发设计高效的复合催化剂具有启发意义。Oxygen evolution reaction(OER),an anodic half-reaction of electrochemical splitting of water,greatly limits the energy efficiency of electrochemical water splitting for producing hydrogen due to its sluggish kinetics.In this work,series of Ag_(2)Se/CoSe_(2)hybrid catalysts were simply prepared by using one-pot hydrothermal method for efficient OER.Among them,the optimum proportion of Ag_(2)Se/CoSe_(2)-3 composite catalyst showed a low overpotential of 220 mV at the current density of 10 mA/cm^(2),which improved the kinetics of OER.The results of scanning electron microscopy(SEM)showed that the Ag_(2)Se/CoSe_(2)composite catalysts have a morphology of microspheres with hierarchical porous structure,which expose a large number of active sites and avail against the mass transfer during the reaction.X-ray photoelectron spectroscopy(XPS)showed that the incorporation of Ag_(2)Se regulated the electronic structure of CoSe_(2),further promoting the improvement of the valence state of Co,thus enhancing the intrinsic catalytic activity of the pristine catalytic active site and significantly reducing the overpotential of OER reaction.This work will be instructive for the development of efficient hybrid catalysts.

关 键 词：CoSe_(2) Ag_(2)Se 析氧反应 电催化 分解水 

分 类 号：O614.1[理学—无机化学]