Journal of Catalysis
Journal of Catalysis
5 years ago

Electrocatalytic performance of cubic NiS2 and hexagonal NiS for oxygen reduction reaction

Electrocatalytic performance of cubic NiS2 and hexagonal NiS for oxygen reduction reaction
Developing high performance and low cost non-precious metal based catalysts for oxygen reduction reaction (ORR) is essential for a wide range of industrial applications of fuel cells. Here, we report the catalytic performance of a novel cubic NiS2 and hexagonal NiS catalysts for ORR. Both the NiS2 and NiS are synthesized by facile one-pot hydrothermal method and exhibit a high level of purity. Compared to conventional Pt/C catalysts, the NiS2 catalyst yields a higher peak current intensity and enhanced long time running stability despite the half wave potential is 40 mV lower than that of Pt/C catalyst. Rotating disc electrode tests show that the NiS2 catalyzes ORR mainly happening through 4-electron pathway. Thus, the NiS catalyzes ORR happening through 2-electron pathway. We envision that the NiS2 catalyst has great potential to be alternate for the Pt/C catalyst for ORR in alkaline fuel cells.

Publisher URL: www.sciencedirect.com/science

DOI: S0021951718300356

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