Ti_(3)C_(2)MXene nanosheets integrated cobalt-doped nickel hydroxide heterostructured composite:An efficient electrocatalyst for overall water-splitting  

作　　者：Amaranadha Reddy Manchuri Kamakshaiah Charyulu Devarayapalli Bolam Kim Youngsu Lim Dae Sung Lee 

机构地区：[1]Department of Environmental Engineering,Kyungpook National University,Buk-gu,Daegu,41566,Republic of Korea

出　　处：《Green Energy & Environment》2025年第4期854-868,共15页绿色能源与环境(英文版)

基　　金：supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF),funded by the Ministry of Education(NRF-2018R1A6A1A03024962);the Ministry of Science and ICT(NRF-2020R1A2C2100746).

摘　　要：Developing an efficient electrocatalyst for superior electrochemical water splitting(EWS)is crucial for achieving comprehensive hydrogen production.A heterostructured electrocatalyst,free of noble metals,Ti_(3)C_(2)MXene nanosheet-integrated cobalt-doped nickel hydroxide(NHCoMX)composite was synthesized via a hydrothermal method.The abundant pores in the Ti_(3)C_(2)MXene nanosheet(MX)-integrated microarchitecture increased the number of active sites and facilitated charge transfer,thus enhancing electrocatalysis.Specifically,the MXenhanced charge transfer considerably transformed the microelectronic structure of cobalt-doped Ni(OH)2(NHCo),which promoted its hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Hence,as an EWS catalyst,NHCoMX exhibited an exceptional electrocatalytic activity,demonstrating OER and HER overpotentials of 310 mV and 73 mV,respectively,with low Tafel slopes of 65 mV dec^(-1)and 85 mV dec^(-1),respectively;it exhibited a current density of 10 mV cm^(-2)in 1.0 mol L^(-1)KOH,representing the closest efficiency to the noble state-of-the-art RuO2 and Pt/C catalyst.Furthermore,the developed electrocatalyst improved the activities of both HER and OER,leading to an overall EWS current density of 10 mA cm^(-2)at 1.72 V in an alkaline electrolyte with two electrodes.This study describes an efficient heterostructured NHCoMX composite electrocatalyst.It is significantly comparable to the noble state-of-the-art electrocatalysts and can be extended to fabricate resourceful catalysts for large-scale EWS applications.

关 键 词：Ti_(3)C_(2)MXene nanosheets Cobalt-doped nickel hydroxide Electrochemical water splitting Oxygen evolution reaction Hydrogen evolution reaction 

分 类 号：O643.36[理学—物理化学]