In situ generation of oxyanions-decorated cobalt(nickel)oxyhydroxide catalyst with high corrosion resistance for stable and efficient seawater oxidation  

作　　者：Fengting Luo Pei Yu Jueting Xiang Junjie Jiang Shijian Chen 

机构地区：[1]Chongqing Key Laboratory of Interface Physics in Energy Conversion,College of Physics,Chongqing University,Chongqing 401331,China [2]Center of Modern Physics,Institute for Smart City of Chongqing University in Liyang,Liyang 213300,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2024年第7期508-516,共9页能源化学（英文版）

基　　金：the funding support from the National Natural Science Foundation of China (U22A2078);the Fundamental Research Funds of Central Universities (2022CDJQY-007 and 2022CDJJCLK001)

摘　　要：The development of efficient and robust anode materials for stable alkaline seawater electrolysis is severely limited by chlorine evolution reaction and chloride corrosion.Here,the sulfur-doped cobalt-nickel bimetallic phosphides(CoNiPS)are specifically designed as a pre-catalyst for navigating a surface reconstruction to fabricate the anions(PO^(3-)_(4) and SO^(2-)_(4))-decorated Co(Ni)OOH catalyst(R-CoNiPS)with exceptional durability and high activity for stable alkaline seawater oxidation(ASO).Various experiment techniques together with theoretical simulations both demonstrate that the in situ-generated PO^(3-)_(4) and SO^(2-)_(4) anions on catalyst surface can improve the oxygen evolution reaction(OER)activity,regulating and stabilizing the catalytic active species Co(Ni)OOH,as well as make a critical role in inhibiting the adsorp-tion of chloride ions and extending the service life of electrode.Therefore,this R-CoNiPS electrode exhi-bits superb OER activity toward AsO and stands out among the non-precious ASO electrocatalysts reported recently,requiring low overpotentials of 420 and 440 mV to attain large current densities of 500 and 1000 mA cm^(-2) in an alkaline natural seawater electrolyte,respectively.Particularly,the catalyst displays a negligible chloride corrosion at room temperature during ASO operation(>200 h)at 500 mA cm^(-2).This work opens up a new viewpoint for designing high-activity and durable electrocata-lystsforseawaterelectrolysis.

关 键 词：Seawater electrolysis Anions Oxygen evolution reaction Chloride corrosion 

分 类 号：TQ116.21[化学工程—无机化工] TQ426