In-situ formed NiS/Ni coupled interface for efficient oxygen evolution and hydrogen evolution  

作　　者：Chaoyi Yan Jianwen Huang Chunyang Wu Yaoyao Li Yuchuan Tan Luying Zhang Yinghui Sun Xiaona Huang Jie Xiong 

机构地区：[1]State Key Laboratory of Electronic Thin Film and Integrated Devices,University of Electronic Science and Technology of China,Chengdu,610054,China [2]Chengdu Technological University,Chengdu,611730,China [3]Soochow Institute for Energy and Materials InnovationS&Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province,Soochow University,Suzhou,215006,China

出　　处：《Journal of Materials Science & Technology》2020年第7期10-16,共7页材料科学技术（英文版）

基　　金：This work was financailly supported by the National Natural Science Foundation of China(Nos.51722204 and 51802145);the National Key Basic Research Program of China(No.2014CB931702);the Sichuan Science and Technology Program(Nos.2018RZ0082 and 2019JDRC0070);the Fundamental Research Fund for the Central Universities(No.A03018023801053);the Open Project of Jiangsu Key Laboratory for Carbon-Based Functional Materials Devices at Soochow University(No.KJS1807).

摘　　要：High-performance electrocatalysts for water splitting are desired due to the urgent requirement of clean and sustainable hydrogen production.To reduce the energy barrier,herein,we adopt a facile in-situ surface modification strategy to develop a low-cost and efficient electrocatalyst for water splitting.The synthesized mulberry-like NiS/Ni nanoparticles exhibit excellent catalytic performance for water splitting.Small overpotentials of 301 and 161 mV are needed to drive the current density of 10 mA cm^-2 accompanying with remarkably low Tafel slopes of 46 and 74 mV dec^-1 for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER),respectively.Meanwhile,a robust electrochemical stability is demonstrated.Further high-resolution X-ray photoelectron spectroscopy analyses reveal that the intrinsic HER activity improvement is attributed to the electron-enriched S on the strongly coupled NiS and Ni interface,which simultaneously facilitates the important electron transfer,consistent with the electrochemical impedance results.The post characterizations demonstrate that surface reconstructed oxyhydroxide contributes to the OER activity and NiS/Ni is an OER precatalyst.This structure construction with in-situ formation of active interface provides an effective way to design efficient electrocatalysts for energy conversion.

关 键 词：Water splitting Interface construction ELECTROCATALYST BIFUNCTIONAL In-situ synthesis 

分 类 号：TQ426[化学工程] TQ116.2