文献类型：期刊文献

英文题名：Interfacial charge polarization in Co2P2O7@N, P co-doped carbon nanocages as Mott-Schottky electrocatalysts for accelerating oxygen evolution reaction

作者：Liang, Da[1];Lian, Cheng[2];Xu, Qiucheng[1];Liu, Miaomiao[1];Liu, Honglai[2];Jiang, Hao[1];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：268

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY

收录：;EI(收录号：20194907786305);WOS:【SCI-EXPANDED(收录号:WOS:000521513300053)】；

基金：This work was supported by the National Natural Science Foundation of China (21838003 and 51621002), the Social Development Program of Shanghai (17DZ1200900), the Shanghai Scientific and Technological Innovation Project (18JC1410600), the National Program for Support of Top-Notch Young Professionals, and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Cobalt pyrophosphates; N, P co-doped carbon; Co-catalysts; Mott-Schottky heterojunction; Oxygen evolution

摘要：Developing heterogeneous non-noble metal electrocatalysts to modulate the valence-electron state near the Fermi level of metal centers is the pivotal for efficient oxygen evolution reaction (OER). Herein, we report a Mott-Schottky heterojunction electrocatalyst of the Co2P2O7@N, P co-doped carbon nanocages, in which the metallic N, P co-doping carbon layer as a co-catalyst can effectively modulate the overfilled Co center e(g) orbital occupation of the Co2P2O7 nanoparticles and stabilize the microstructure. The density functional theory (DFT) calculations also reveal the build-in electric field promoted local charge polarization in the heterojunction interface greatly boosts the targeted intermediate (OOH*) adsorption with a higher intrinsic activity. The asobtained electrocatalysts manifest superior OER catalytic performance with an overpotential of only 310 mV at a current density of 50 mA cm(-2) and negligible current loss for 100 h in 1.0 M KOH, much lower than the benchmark RuO2 (370 mV). This work demonstrates a heterointerface charge polarization concept to accelerate OER in efficient electrocatalysts for water splitting.