Abstract
AbstractExploring cost‐efficient, high‐active bifunctional electrochemical catalysts with long‐term stability are significant for green economy. Herein, a noble‐metal‐free sandwich‐structured catalyst, prepared with facile hydrothermal method and phosphorization process, in which the amorphous MoSx serves as an intermediate layer between the Fe‐doped Ni2P and Ni foam substrate (Fe‐Ni2P/MoSx/NF) is reported. The obtained free‐standing catalyst performs an enhanced electrochemical activity compared with Fe‐Ni2P/NF and MoSx/NF. The Fe‐Ni2P/MoSx/NF catalyst only requires overpotentials of 246 mV to achieve 10 mA cm−2 and 277 mV to reach 50 mA cm−2 for oxygen evolution reaction process with a low Tafel slope of 59.7 mV dec−1 in alkaline solution. Meanwhile, an overpotential of 112 mV is demanded to reach 10 mA cm−2 for hydrogen evolution reaction. When the Fe‐Ni2P/MoSx/NF is used as two electrodes for overall water splitting, it requires 1.61 V to attain 10 mA cm−2 with prominent durability. This approach provides a versatile strategy to construct excellent bifunctional catalysts for effective water electrolysis.
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