A high‐performance transition‐metal phosphide electrocatalyst for converting solar energy into hydrogen at 19.6% STH efficiency  

作　　者：Hua Zhang Abuduwayiti Aierke Yingtang Zhou Zitao Ni Ligang Feng Anran Chen Thomas Wågberg Guangzhi Hu 

机构地区：[1]Institute for Ecological Research and Pollution Control of Plateau Lakes,School of Ecology and Environmental Sciences,School of Materials and Energy,Yunnan University,Kunming,People's Republic of China [2]School of Energy and Environment Science,Yunnan Normal University,Kunming,People's Republic of China [3]National Engineering Research Center for Marine Aquaculture,Marine Science and Technology College,Zhejiang Ocean University,Zhoushan,People's Republic of China [4]School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou,People's Republic of China [5]Department of Physics,UmeåUniversity,Umeå,Sweden

出　　处：《Carbon Energy》2023年第1期206-217,共12页碳能源（英文）

基　　金：supported by the Double Tops Joint Fund of the Yunnan Science and Technology Bureau and Yunnan University(2019FY003025);the National Natural Science Foundation of China(U2002213 and 51621001);the East-Land Middle-aged and Young Backbone Teacher of Yunnan University(No.C176220200);Yunnan Applied Basic Research Projects(202001BB050006,202001BB050007);the Double-First Class University Plan(C176220100042).

摘　　要：The construction of high-efficiency and low-cost non-noble metal bifunctional electrocatalysts for water electrolysis is crucial for commercial large-scale application of hydrogen energy.Here,we report a novel strategy with erbiumdoped NiCoP nanowire arrays in situ grown on conductive nickel foam(Er-NiCoP/NF).Significantly,the developed electrode shows exceptional bifunctional catalytic activity,which only requires overpotentials of 46 and 225 mV to afford a current density of 10 mAcm^(−2) for the hydrogen evolution reaction(HER)and the oxygen evolution reaction(OER),respectively.Density functional theory calculations reveal that the appropriate Er incorporation into the NiCoP lattice can significantly modulate the electronic structure with the d-band centers of Ni and Co atoms by shifting to lower energies with respect to the Fermi level,and optimize the Gibbs free energies of HER/OER intermediates,thereby accelerating water-splitting kinetics.When assembled as a solar-driven overall water-splitting electrolyzer,the as-prepared electrode shows a high and stable solar-to-hydrogen efficiency of 19.6%,indicating its potential for practical storage of intermittent energy.

关 键 词：bifunctional electrocatalysts electronic regulation hydrogen evolution reaction oxygen evolution reaction solar-to-hydrogen efficiency 

分 类 号：TQ116.2[化学工程—无机化工] TM914.4[电气工程—电力电子与电力传动]