摘要
The development of bifunctional electrocatalysts for overall water splitting is highly desired for converting electricity into chemical energy.However,the synthesis of high-performance bifunctional electrocatalysts remains a pressing challenge.Here,we found that both the oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)performance of the Co_(3)S_(4) electrode can be significantly improved by integration with CeO_(2).Specifically,as-prepared 5%Ce-Co_(3)S_(4) and 1%Ce-Co_(3)S_(4) delivered low overpotentials of 290 and 257 mV to achieve 10 mA cm^(-2) for the OER and HER in 1.0 M KOH,respectively.The crucial role of CeO_(2) originated from its unique surface with abundant oxygen vacancies,which were beneficial for the stabilization of Co^(2+)sites with high OER activity and both the adsorption and dissociation of water molecules in the HER process.This work is expected to provide a general approach to prepare a wide range of high-performance electrode materials for energy-related applications.
基金
supported by the financial aid from the National Science and Technology Major Project(2020YFE0204500 and 2016YFA0203200)
National Natural Science Foundation of China(21771173,22020102003 and 22025506).
