Preparation of Fe-Doped Ni₃S₂/Ni(OH)₂/Ni/NSG Composites and Enhanced Water Splitting Performance

Herein, Fe-doped Ni3S2/Ni(OH)(2)/Ni@NSG electrocatalysts are prepared by dealloying Ni-Al precursors followed by magnetic stirring. It is found that the hydrogen precipitation reaction (HER) of NSG-Fe-25 is 148 mV at a current density of 10 mA cm(-2) and the oxygen evolution reaction (OER) is 274 mV at a current density of 50 mA cm(-2) compared to NSG-Fe-5, NSG-Fe-45, Ni-NN-Fe, and Ni-NN-Fe@NSG. The Tafel slopes for the HER are 81.6 mV dec(-1), and the Tafel slope of OER is 61.6 mV dec(-1), while the C-dl value of NSG-Fe-25 is larger and the resistance value is smaller. Therefore, NSG-Fe-25 has the optimal performance. The heterostructure of Fe-doped Ni3S2/Ni(OH)(2)/Ni@NSG provides abundant active sites for surface HER and OER, which enhances the electronic conductivity of the electrode. Meanwhile, long-term constant-current electrolysis test experiments show that NSG-Fe has good stability in use. The present study opens a new window for the design and preparation of total hydrolysis electrocatalysts.