122nd General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Grand Ballroom
Time 10월 19일 (금요일) 11:00~12:30
Code ELEC.P-457
Subject Activating MoS2 basal plane with Ni2P nanoparticles for hydrogen evolution reaction in acidic media
Authors Minkyung Kim, Jae Sung Lee1,*
Department of Energy Engineering, Ulsan National Institute of Science and Technology, Korea
1School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Korea
Abstract The hydrogen production via electrochemical water splitting is a sustainable way to address both energy and environmental issues of the world. An efficient, durable and cheaper electrocatalyst is desired for effectively catalyzing hydrogen evolution reaction (HER) in real applications. The noble metals (Pt, Ru) based are most efficient catalysts in acidic electrolyte due to their low metal-hydrogen (M-H) bond strength desired for fast HER kinetics. Two dimensional MoS2 is considered as an alternative Pt that displays a modest hydrogen evolution reaction (HER) activity in acidic media because the active sites are limited to a small number of edge sites with broader basal planes remaining mostly inert. Here we report that the basal planes could be activated by growing Ni2P nanoparticles on it. Thus, a Ni2P/MoS2 heterostructure is constructed via in-situ phosphidation of an ingeniously synthesized NiMoS4 salt to form a widely cross-doped and chemically connected heterostructure. The conductivity and stability of the Ni2P/MoS2 are further enhanced by hybridization with conductive N-doped carbon support. As a result, the Ni2P/MoS2/N:RGO or N:CNT displays Pt-like HER performance in acidic media, outperforming the incumbent best HER electrocatalyst, Pt/C, in more meaningful high current density region (>200 mA/cm2) making them a promising candidate for practical water electrolysis applications. Non-precious metal catalysts showing Pt-like HER performance in acidic media are rare, our hybrid catalyst is a promising candidate for practical hydrogen production via water electrolysis.
E-mail mkk0411@unist.ac.kr