Abstract
NiS2 is rationally and readily prepared via a simple and general hydrothermal synthetic route. The particle sizes of NiS2 species are tunable by adjusting the pH value of the hybrid solution. The optimized sample (NiS2-4) contains NiS2 nanoparticles of about 32.6 nm, and large surface area of 368.5 m2 g–1. The high surface area renders NiS2-4 an excellent electrocatalytic performance for ethanol oxidation. NiS2-4 electrode also exhibits a good long-term cycling stability. 93.3% of the initial current density is recovered by moving the NiS2-4 electrode into fresh 0.1 M NaOH solution with 0.5 M ethanol after 500 cycles. The excellent electrocatalytic properties of NiS2-4 for ethanol oxidation stems from the high surface areas.
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