NiS2 Nanoparticles with Tunable Surface Area As Catalyst for Ethanol Oxidation
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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.
Keywords:NiS2 surface area mesopore electrochemical catalyst ethanol oxidation
This research was supported by Natural Science Foundations of Tianjin (nos. 15JCQNJC05700, 17JCTPJC47300, and 17JCQNJC06100), Natural Science Foundations of China (nos. 21271138 and 21703152), and the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry of Jilin University (no. 2015−02).
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