Journal
JOURNAL OF POWER SOURCES
Volume 360, Issue -, Pages 106-113Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.05.120
Keywords
Non-precious metal catalysts; Nitrogen and sulfur co-doping; Biomass glucose spheres; Highly dispersed cobalt (II) oxide; Oxygen reduction reaction
Funding
- National Natural Science Foundation of China [51371086]
- analytical and testing center of Huazhong University of Science and Technology
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It is still a great challenge in preparing non-precious metal catalysts with high activity and long-term stability to substitute for precious metal catalysts for oxygen reduction reaction (ORR) in fuel cells. Herein, we report a novel and facile catalyst-N, S co-doped carbon spheres with highly dispersed COO (CoO@NS-CSs), where biomass glucose spheres act as carbon precursor and H2S, NH3 derived from the decomposition of thiourea not only provide N, S sources but also can etch carbon spheres to produce nanoporous structure. CoO@NS-CSs catalyst exhibits excellent ORR activity with a high onset potential of 0.946 V vs. RHE (reversible hydrogen electrode) and a half-wave potential of 0.821 V vs. RHE through a four-electron pathway in alkaline solution, which is comparable to commercial Pt/C catalyst (onset potential: 0.926 V vs. RHE, half-wave potential: 0.827 V vs. RHE). Furthermore, both the long-term stability and methanol-tolerance of CoO@NS-CSs catalyst are superior to those of commercial Pt/C catalyst. The excellent ORR performance of CoO@NS-CSs catalyst can be attributed to its micro-mesopore structure, high specific surface area (667 m(2) g(-1)), and highly dispersed CoO. This work manifests that the obtained CoO@NS-CSs catalyst is promising to be applied to fuel cells. (C) 2017 Elsevier B.V. All rights reserved.
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