Regulating the Electronic Structure of CoP Nanosheets by O Incorporation for High-Efficiency Electrochemical Overall Water Splitting
Zhou, GY (Zhou, Guangyao)[ 1 ] ; Li, M (Li, Meng)[ 1 ] ; Li, YL (Li, Yanle)[ 2 ] ; Dong, H (Dong, Hang)[ 1 ] ; Sun, DM (Sun, Dongmei)[ 1 ] ; Liu, X (Liu, Xien)[ 3 ] ; Xu, L (Xu, Lin)[ 1 ]*（徐林） ; Tian, ZQ (Tian, Ziqi)[ 2 ] ; Tang, YW (Tang, Yawen)[ 1 ]*（唐亚文）
[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China
[ 3 ] Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042, Shandong, Peoples R China
ADVANCED FUNCTIONAL MATERIALS，201912, 1905252
The exploration of earth-abundant and high-efficiency bifunctional electrocatalysts for overall water splitting is of vital importance for the future of the hydrogen economy. Regulation of electronic structure through heteroatom doping represents one of the most powerful strategies to boost the electrocatalytic performance of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, a rational design of O-incorporated CoP (denoted as O-CoP) nanosheets, which synergistically integrate the favorable thermodynamics through modification of electronic structures with accelerated kinetics through nanostructuring, is reported. Experimental results and density functional theory simulations manifest that the appropriate O incorporation into CoP can dramatically modulate the electronic structure of CoP and alter the adsorption free energies of reaction intermediates, thus promoting the HER and OER activities. Specifically, the optimized O-CoP nanosheets exhibit efficient bifunctional performance in alkaline electrolyte, requiring overpotentials of 98 and 310 mV to deliver a current density of 10 mA cm(-2) for HER and OER, respectively. When served as bifunctional electrocatalysts for overall water splitting, a low cell voltage of 1.60 V is needed for achieving a current density of 10 mA cm(-2). This proposed anion-doping strategy will bring new inspiration to boost the electrocatalytic performance of transition metal-based electrocatalysts for energy conversion applications.