Abstract
Rational design of highly efficient,robust and nonprecious electrocatalysts for the oxygen reduction reac-tion(ORR),oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)is highly demanded and challenging.Here,heterostructural Co3O4@Ni2P arrays with numerous reaction sites,unique interfa-cial electronic structure and fast charge transfer kinetics are developed as electrocatalysts for rechargeable Zn-air batteries and overall water splitting.Both density functional theory calculation and X-ray absorp-tion fine structure analysis manifest that the synergistic structural and abundant electronic modulations interfaces are formed,thus simultaneously promoting the electrocatalytic kinetics,activities and stabil-ities.Specifically,it can achieve an ultralow overpotential of 270 mV and 28 mV at 10 mA cm-2 for OER and HER,respectively.The water electrolyzer delivers a current density of 10 mA cm-2 at 1.563 V;furthermore,rechargeable Zn-air batteries triggered by this heterostructure can achieve excellent cyclic stability of 177 h(2 h per cycle)at 10 mA cm-2;both devices are superior to the Pt/C+Ir/C.This work not only designs an efficient trifunctional electrocatalyst but also paves an avenue to understand the het-erostructure engineering for catalysts development and disclose the underlying relationship of interfacial electronic structures and catalytic properties.
基金项目
国家自然科学基金(22179014)
国家自然科学基金(21603019)
Fundamental Research Funds for the Central Universities(2021CDJQY-051)
Key Program for International Science and Technology Cooperation Projects of Ministry of Science and Tech-nology of China(2016YFE0125900)
Hundred Talents Program of Chongqing University()
NETL
NSTL
万方数据