Hydrogen spillover bridged dual nano-islands triggered by built-in electric field for efficient and robust alkaline hydrogen evolution at ampere-level current density  

作　　者：Kecheng Tong Liangliang Xu Hanxu Yao Xingkun Wang Canhui Zhang Fan Yang Lei Chu Jinwoo Lee Heqing Jiang Minghua Huang 

机构地区：[1]School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China [2]Department of Chemical and Biomolecular Engineering,Korea Advanced Institute of Science and Technology(KAIST),291,Daejeon 34141,Republic of Korea [3]Qingdao New Energy Shandong Laboratory,Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101,China [4]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Nano Research》2024年第6期5050-5060,共11页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(Nos.22279124 and 52261145700);Shandong Province Natural Science Foundation(No.ZR2022ZD30);National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(Nos.NRF-2020R1A2C3004146 and RS-2023-00235596).

摘　　要：Employing the alkaline water electrolysis system to generate hydrogen holds great prospects but still poses significant challenges,particularly for the construction of hydrogen evolution reaction(HER)catalysts operating at ampere-level current density.Herein,the unique Ru and RuP_(2)dual nano-islands are deliberately implanted on N-doped carbon substrate(denoted as Ru-RuP_(2)/NC),in which a built-in electric field(BEF)is spontaneously generated between Ru-RuP_(2)dual nano-islands driven by their work function difference.Experimental and theoretical results unveil that such constructed BEF could serve as the driving force for triggering fast hydrogen spillover process on bridged Ru-RuP_(2)dual nano-islands,which could invalidate the inhibitory effect of high hydrogen coverage at ampere-level current density,and synchronously speed up the water dissociation on Ru nano-islands and hydrogen adsorption/desorption on RuP_(2)nano-islands through hydrogen spillover process.As a result,the Ru-RuP_(2)/NC affords an ultra-low overpotential of 218 mV to achieve 1.0 A·cm^(−2)along with the superior stability over 1000 h,holding the great promising prospect in practical applications at ampere-level current density.More importantly,this work is the first to advance the scientific understanding of the relationship between the constructed BEF and hydrogen spillover process,which could be enlightening for the rational design of the cost-effective alkaline HER catalysts at ampere-level current density.

关 键 词：built-in electric field hydrogen spillover dual nano-islands ampere-level current density alkaline hydrogen evolution 

分 类 号：O64[理学—物理化学]