A. Simchi
Electrochemical water splitting by low-cost non-noble transition metals have attracted significant interest in recent years. However, single metal electrodes suffer from low electrocatalytic activity. Therefore, exploiting mix-metal strategy and benefiting from synergistic role of different transition metals seems to be a suitable approach. We present, for the first time, a sulfurized ternary mixed transition metal (Ni-Co-Fe) layer on Ni foam with robust electrocatalytic activity toward oxygen evolution reaction (OER). Ni-Co-Fe LDH electrodeposited on Ni foam and followed a final solvothermal process for sulfurization. To further improve the electrochemical activity, a NiFe layered double hydroxide have been electrodeposited on NiCoFe-S/Ni foam. Electrochemical measurements exhibited high OER performance of the NiFe/ NiCoFe-S/Ni foam sandwich structure. The developed procedure provides a new approach for combining efficient structures of transition metals for a highly active electrocatalyst toward water splitting.
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