Effect of mass transfer process on hydrogen adsorption on polycrystalline platinum electrode in sulfuric acid solution

查看全文 作　　者：Wei [1,2]Zhang;Yang [1]Liu;Hainan [1]Luo;Changwei [2]Pan 机构地区：[1]College of Chemical Engineering and Material Science, Zaozhuang University, Zaozhuang 277160, China;[2]College of Chemical Engineering, China University of Mining and Technology, Xuzhou 221116, China 出　　处：《Chinese Chemical Letters》索引2019年第30卷第6期,共5页 基　　金：the National Natural Science Foundation of China (No. 21773304); the Fundamental Research Funds for the Central Universities(No. 2015XKZD09);the Natural Science Foundation of Jiangsu Province(No. BK20160240);the Research Innovation Project for College Graduates of Jiangsu Province (No. KYLX16_0549);the Research Foundation Project of Zaozhuang University (No. 2017YB24);Doctoral Foundation Program of Zaozhuang University(No.2018BS060,102201702) 摘　　要：The underpotential adsorption of hydrogen (HUPD) is one of the most attractive fields in surface electrochemistry and electrocatalysis. In this work, the hydrogen adsorption on polycrystalline platinum electrode experimentally as well as on single crystal Pt(110) and Pt(100) electrode theoretically were studied. The effect of forced convection on the adsorption and desorption process of hydrogen was studied through adjusting the sampling rate of the microporous sampler closing to the surface of the platinum electrode immersed in dilute sulfuric acid solution. The relationship between HUPD and surface structure sensitivity was built quantitively. The DFT simulation shows that the adsorption strength of hydrogen on Pt(100), due to the lower adsorption energy, is weaker than that on Pt(110). Moreover, the bridged position of hydrogen on Pt(100) and the short-range bridged position on Pt(110) were found to be the optimal adsorption sites. The study of forced convection on the electrode surface promotes the HUPD research from static process to a convective mode and also provides a new strategy to investigate the hydrogen adsorption in solution. 关 键 词：HUPD DFT Mass TRANSFER PLATINUM ELECTRODE Pt(110) Pt(100)