Journal
NANO RESEARCH
Volume 11, Issue 3, Pages 1389-1398Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1754-5
Keywords
three-dimensional; graphene; Ni3S2@G@Co9S8; oxygen evolution reaction
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Funding
- National Natural Science Foundation of China (NSFC) [61525402, 5161101159]
- Key University Science Research Project of Jiangsu Province [15KJA430006]
- QingLan Project
- National Postdoctoral Program for Innovative Talents [BX201600072]
- China Postdoctoral Science Foundation [2016M601792]
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A highly active and stable oxygen evolution reaction (OER) electrocatalyst is critical for hydrogen production from water splitting. Herein, three-dimensional Ni3S2@graphene@Co9S8 (Ni3S2@G@Co9S8), a sandwich-structured OER electrocatalyst, was grown in situ on nickel foam; it afforded an enhanced catalytic performance when highly conductive graphene is introduced as an intermediary for enhancing the electron transfer rate and stability. Serving as a free-standing electrocatalytic electrode, Ni3S2@G@Co9S8 presents excellent electrocatalytic activities for OER: A low onset overpotential (2 mA.cm(-2) at 174 mV), large anode current density (10 mA.cm(-2) at an overpotential of 210 mV), low Tafel slope (66 mV.dec(-1)), and predominant durability of over 96 h (releasing a current density of similar to 14 mA.cm(-2) with a low and constant overpotential of 215 mV) in a 1 M KOH solution. This work provides a promising, cost-efficient electrocatalyst and sheds new light on improving the electrochemical performance of composites through enhancing the electron transfer rate and stability by introducing graphene as an intermediary.
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