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

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

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Developing bifunctional catalysts that can cat-alyze both oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)is pivotal to commercializing large-scale water splitting.Herein,a novel hollow nano-triangle composed of NiFe LDH-CoMoSx 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 frame-work-derived hollow CoMoSx nanotriangle.The strong coupling of CoMoSx and NiFe LDH catalysts forms the intimate heterojunction interfaces to facilitate interfacial charge transfer,which is favorable to enhance the bifunc-tional catalytic activity.Moreover,the large void of CoMoSx 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.

Overall water splittingMetal-organic frameworkMolybdenum sulfideLayered double hydroxideHeterojunction

Yun Jae Lee、Seung-Keun Park

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Department of Advanced Materials Engineering,Chung-Ang University,Anseong,Gyeonggi-do 17546,Republic of Korea

Department of Intelligent Energy and Industry,Chung-Ang University,84 Heukseok-ro Dongjak-gu,Seoul 06974,Republic of Korea

Western Seoul Center,Korea Basic Science Institute,150 Bugahyeon-ro,Seodaemun-gu,Seoul 03759,Republic of Korea

National Research Foundation of Korea(NRF)from the Korean governmentKorea Institute for Advancement of Technology(KIAT)grant funded by the Korea Government(MOTIE)(HRD Program for Industrial Innova

2020R1C1C1003375P00124539

2024

10.1007/s12598-023-02425-7

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(2)
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