Synergistically coupling of Ni–Fe LDH arrays with hollow Co–Mo sulfide nanotriangles for highly efficient overall water splitting  

作　　者：Yun Jae Lee Seung-Keun Park 

机构地区：[1]Department of Advanced Materials Engineering,Chung-Ang University,Anseong,Gyeonggi-do,17546,Republic of Korea [2]Department of Intelligent Energy and Industry,Chung-Ang University,84 Heukseok-ro Dongjak-gu,Seoul,06974,Republic of Korea [3]Western Seoul Center,Korea Basic Science Institute,150 Bugahyeon-ro,Seodaemun-gu,Seoul,03759,Republic of Korea

出　　处：《Rare Metals》2024年第2期522-532,共11页稀有金属（英文版）

基　　金：This work was financially supported by the National Research Foundation of Korea(NRF)from the Korean government(No.2020R1C1C1003375);Korea Institute for Advancement of Technology(KIAT)grant funded by the Korea Government(MOTIE)(No.P00124539)(HRD Program for Industrial Innovation).

摘　　要：Developing bifunctional catalysts that can catalyze both oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)is pivotal to commercializing large-scale water splitting.Herein,a novel hollow nanotriangle composed of NiFe LDH-CoMoS_(x) heterojunction(H-CMSx@NiFe LDH)is proposed as a highly efficient bifunctional electrocatalyst for both OER and HER.To fabricate a heterojunction system,ultra-thin nickel–iron layered double hydroxide(NiFe LDH)nanosheets are uniformly electrodeposited onto a metal–organic framework-derived hollow CoMoS_(x) nanotriangle.The strong coupling of CoMoS_(x) and NiFe LDH catalysts forms the intimate heterojunction interfaces to facilitate interfacial charge transfer,which is favorable to enhance the bifunctional catalytic activity.Moreover,the large void of CoMoS_(x) nanotriangles and interconnected ultra-thin NiFe LDH nanosheets result in good electrolyte penetration and gas release.Therefore,the as-prepared H-CMSx@NiFe LDH on nickel foam(NF)exhibits an impressive catalytic activity and durability for OER and HER activities,delivering a current density of 100 mA·cm^(−2) at the small overpotentials of 214 and 299 mV in OER and HER,respectively.Meanwhile,H-CMSx@NiFe LDH/NF proves to be an effective electrode for an alkaline electrolyzer,as a voltage of only 1.99 V is enough to achieve a current density voltage of only 1.99 V is enough to achieve a current density of 400 mA·cm^(−2) with no degradation in performance over 50 h.

关 键 词：Overall water splitting Metal-organic framework Molybdenum sulfide Layered double hydroxide HETEROJUNCTION 

分 类 号：TQ116.2[化学工程—无机化工] TQ426