Journal
JOURNAL OF CATALYSIS
Volume 359, Issue -, Pages 223-232Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2018.01.019
Keywords
Oxygen reduction reaction; Catalyst; NiS2; Electrocatalysis; Electron transfer number
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Funding
- Science Development Project of Shandong Provincial [2017GGX40115, 2016GGX102038]
- National Natural Science Foundation of China [21407060]
- Shandong Provincial Natural Science Foundation [ZR2015EM044, 20148Q032]
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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. (C) 2018 Elsevier Inc. All rights reserved.
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