Determining the electrochemical activation mechanism of Prussian blue analog precatalysts for a high-efficiency oxygen evolution reaction  

作　　者：Wei Hua Huanhuan Sun Yueying Li Yu Zhang Jian-Gan Wang 

机构地区：[1]State Key Laboratory of Solidification Processing,Center for Nano Energy Materials,School of Materials Science and Engi-neering,Northwestern Polytechnical University and Shaanxi Joint Lab of Graphene(NPU),Xi’an 710072,China [2]New Energy(Photovoltaic)Industry Research Center,Qinghai University,Xining 810016,China [3]School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Energy Materials and Devices》2023年第2期119-130,共12页能源材料与器件（英文）

基　　金：sponsored by the National Natural Science Foundation of China(52272239);Fundamental Research Funds for the Central Universities(3102019JC005);Key Research and Technological Achievements Transformation Plan Project of Inner Mongolia Autonomous Region(2023YFHH0063).

摘　　要：Prussian blue analogs(PBAs)are effective precatalysts for the oxygen evolution reaction(OER);however,the underlying mechanism of their electrochemical activation is still not well elucidated.In this study,we designed and constructed PBA-based precatalysts to determine the electrochemical activation mechanism and achieve high-efficiency OER.The PBAs undergo in situ electrochemical transformation to form the corre-sponding metal(oxy)hydroxides(M(O)OH)as the true OER catalyst.More importantly,the hexacyanoferrate ligands undergo repetitive interfacial coordination/etching with/from M(O)OH during the activation process.The distinct mechanism could achieve in situ Fe doping and enable defect incorporation.The defect-enriched Fe-NiOOH derived from a well-designed NiHCF/Ni(OH)2 precatalyst requires a low overpotential of 227 mV to reach a current density of 10 mA cm−2 and works stably at 130 mA cm−2 over 100 h.This study provides fundamental insights into the electrochemical activation mechanism for developing advanced precatalysts for OER.

关 键 词：electrochemical activation Prussian blue analogs oxygen evolution reaction water splitting 

分 类 号：O62[理学—有机化学]