Active straining engineering on self-assembled stacked Ni-based hybrid electrode for ultra-low overpotential  

作　　者：Shujie Liu Rui-Ting Gao Xianhu Liu Xueyuan Zhang Limin Wu Lei Wang 

机构地区：[1]College of Chemistry and Chemical Engineering,Inner Mongolia University,Hohhot 010021,Inner Mongolia,China [2]Key Laboratory of Materials Processing and Mold,Ministry of Education,Zhengzhou University,Zhengzhou 450002,Henan,China [3]State Key Laboratory of Chemo/Biosensing and Chemometrics,College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,Hunan,China [4]Department of Materials Science,State Key Laboratory of Molecular Engineering of Polymers,Fudan University,Shanghai 200433,China

出　　处：《Journal of Energy Chemistry》2023年第2期217-226,I0006,共11页能源化学（英文版）

基　　金：supported by the National Natural Science Foundations of China(21965024,22269016,51721002);the Inner Mongolia funding(2020JQ01,21300-5223601);the funding of Inner Mongolia University(10000-21311201/137,213005223601/003,21300-5223707)。

摘　　要：Generating sufficient strains on metal surfaces are highly challenging owing to that most metals can deform plastically to relax the strains on the surfaces.In this work,we developed a facile but highly efficient stacked deposition strategy to in situ activation and reconstruction of NiO/NiOOH on Ni matrix,following with the migration of Fe ions to NiOOH.The Fe sites on the Ni/NiO/NiOOH facilitate the formation of the stable*OH oxygenated intermediates,and the Ni matrix in the catalyst provides the catalyst excellent stability.The oxygen evolution reaction(OER)performance of the stacked NiFe-5 with compressive strain displays the strengthened binding to oxygenated intermediates and superior OER activity,the ultralow overpotentials of 162 versus reversible hydrogen electrode at 10 mA cm^(-2).On the other hand,the Ni-5 without the incorporation of Fe has shown an outstanding hydrogen evolution reaction(HER)activity,affording an overpotential of 47 mV at 10 mA cm^(-2).The NiFe-5‖Ni-5 enables the overall water splitting at a voltage of 1.508 V to achieve 20 mA cm^(-2) with remarkable durability.The stacked deposition strategy improves binding strength of Ni-based catalysts to oxygenated intermediates via generating compressive strain,causing high catalytic activities on OER and HER.

关 键 词：Ni-based catalysts Self-assembly stacked structure Ultra-low overpotential Water splitting 

分 类 号：TQ116.2[化学工程—无机化工] TQ426