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Nickel sulfide (ni2s3) is one of the most promising nonprecious electrocatalysts for water splitting, as it exhibits high electrocatalytic performance for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). It is also one of the most abundant and economically important metal sulfides.
A binder-free Ni3S2 electrode has been successfully prepared via hydrothermal reaction and surface engineering, and then employed as the cathode of an aqueous rechargeable Ni-Zn battery. It exhibits superb reversible specific capacitance (1621.6 F g-1 at 0.2 A g-1) and extraordinary rate capability (62.1% retention under 8 A g-1). The electrode is very promising for numerous electronic and electric vehicle applications, as it can provide excellent energy storage capacity, excellent cycling durability, and long service life.
Besides, it is a promising material for HER and OER in alkaline electrolytes with an overpotential of only 228 mV and 109 mV, respectively, at 10 mA cm-2, which is much lower than most transition metal electrodes. It is also very stable, exhibiting a low
To fabricate the ZnO/ni2s3 composite, we employ a two-step CV electrodeposition method, as shown in Figure 2. Firstly, potentiostatic deposition is adopted to deposit ZnO nanosheets on the Ni foam substrate, and then the substrate is treated with a similar three-electrode system for obtaining a layer of ni2s3 on the surface of the ZnO.
Compared with the seed-layer growth method, this two-step CV electrodeposition strategy is a more convenient and practical preparation approach. Moreover, it has many advantages, such as easier operation, shorter experiment period, and good repeatability. Especially, it can be used to deposit a large number of ni2s3 layers with various thicknesses on the ZnO substrate.