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Metal–Molybdenum Sulfide Nanosheet Arrays Prepared by Anion Exchange as Catalysts for Hydrogen Evolution
Author(s) -
Ma Shengyu,
Zhuo Qiming,
Li Wenlong,
Zhao Yilong,
Zhou Dinghua,
Shan Yu,
Li Fusheng,
Sun Licheng
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000595
Subject(s) - nanosheet , materials science , catalysis , molybdenum , electrochemistry , inorganic chemistry , amorphous solid , molybdate , sulfide , chemical engineering , electrode , nanotechnology , chemistry , metallurgy , organic chemistry , engineering
Metal–molybdenum sulfide (MMoS x )‐based catalysts exhibit good performance over a wide pH range toward hydrogen evolution with relatively low overvoltage requirements. Therefore, they are considered as suitable alternatives to Pt as catalysts for hydrogen evolution reaction. Herein, self‐supported amorphous CuMoS x and NiMoS x nanosheet arrays are prepared on copper foam (CF) and nickel foam (NF), respectively, through an anion‐exchange strategy. CF and NF are first converted into CuTCNQ and NiTCNQ nanowire arrays (TCNQ = tetracyanoquinodimethane), which are then in situ reacted with (NH 4 ) 2 MoS 4 solution to generate amorphous CuMoS x /CF and NiMoS x /NF nanosheets, respectively, as efficient electrocatalysts for H 2 generation. NiMoS x /NF exhibits a superior catalytic activity to CuMoS x /CF in 0.5 m H 2 SO 4 solution, as CuMoS x /CF requires overpotentials ( η ) of 213 and 275 mV to obtain current densities of 10 and 50 mA cm −2 , respectively, whereas NiMoS x /NF only requires η of 174 and 248 mV to receive the same current densities, respectively. Furthermore, these electrodes exhibit considerable long‐term electrochemical durability. Herein, an effective and easy‐to‐operate strategy for the construction of self‐supported metal–molybdenum sulfide nanosheet arrays films toward a highly efficient electrochemical hydrogen generation reaction is provided.