Journal
APPLIED SURFACE SCIENCE
Volume 539, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148229
Keywords
Anti-corrosive coating; Hydrothermal growth; FeO@CuCo2S4; Catalytically active sites; Hydrogen evolution reaction
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Funding
- National Research Foundation (NRF) of Korea [2018R1D1A1B07 049046, 2016R1A6A1A03012877, 2018R1A2B6007436]
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The FeO@CuCo2S4 electrocatalyst exhibits excellent hydrogen evolution reaction performance and stability due to the synergy between FeO and CCS, as elucidated by density functional theory, resulting from electrocatalytically activated surface, anti-corrosive surface, and improved electronic conductivity.
An anti-corrosive FeO@CuCo2S4 electrocatalyst, with highly-active catalytic sites, is fabricated using a mild hydrothermal and magnetron sputtering growth technique. FeO@CuCo2S4 shows excellent hydrogen evolution reaction (HER) in an alkaline KOH electrolyte with a low overpotential of 107 mV at 10 mA/cm(2) and a small Tafel slope of 136 mV/dec. Moreover, long-term stability tests at various current densities, up to 100 mA/cm(2), demonstrate its excellent sustainability. The excellent HER catalytic performance and stability are attributed to the synergy between FeO and CCS elucidated by density functional theory, which is aroused from electrocatalytically activated surface, anti-corrosive surface, and the improved electronic conductivity.
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