Ultrafast electrochemical selenium doping strategy and the role of selenium in nickel-cobalt sulfide for enhanced overall water splitting  

作　　者：Guojing Wang Yuzhuo Sun Yidan Zhao Chen Deng Yuanzhi Zhu Yunchao Li 

机构地区：[1]Key laboratory of Theoretical and Computational Photochemistry,Ministry of Education,College of Chemistry,Beijing Normal University,Beijing 100875,China [2]Faculty of Chemical Engineering,Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials,Kunming University of Science and Technology,Kunming 650500,China [3]PetroChina Shenzhen New Energy Research Institute Co.,Ltd.,Shenzhen 518052,China

出　　处：《Nano Research》2025年第2期242-254,共13页纳米研究(英文版)

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.22272008 and 21872011);the Project of PetroChina Technology Management Department(No.2023ZZ1202).

摘　　要：Heteroatom doping has emerged as an effective strategy to enhance the performance of electrocatalysts for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Traditional doping methods often involve harsh chemical treatments and tedious procedures,hindering their widespread applications.Furthermore,although dynamic surface reconstruction in alkaline media is commonly observed in bimetallic compounds,strategies to regulatethis reconstruction behavior for enhanced HER and OER performances remain inadequately explored.Herein,we report an ultrafast(≤300 s)and mild electrochemical doping approach to fabricate Se-doped NiCo_(2)S_(4) hollow nanoarrays on carbon fiber papers(a-NiCo_(2)(S_(1-x)Se_(x))_(4)),investigating the role of Se in enhancing overall water splitting performance.Under HER conditions,a-NiCo_(2)(S_(1-x)Se_(x))_(4) demonstrates remarkable stability,with Se tuning the electronic structure to optimize intermediate adsorption and facilitate H_(2)O dissociation.While under OER conditions,Se doping lowers the energy barrier for reconstruction and promotes transformation into active Se,S co-doped Ni_(0.33)Co_(0.67)OOH nanosheets.The optimal samples exhibit superior HER and OER activity,requiring a cell voltage of 1.578 V to deliver a current density of 100 mA·cm^(-2) for overall water spltting.This work not only introduces a facile method for Se doping but also provides comprehensive insights into the structure-composition-activity relationship for Se-doped bimetallic sulfide.

关 键 词：electrochemical Se doping amorphous NiCo_(2)(S_(1-x)Sex)_(4)porous nanoarrays electrochemical reconstruction electronic structure modulation overall water splitting 

分 类 号：O64[理学—物理化学]