Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 19, Pages 21605-21615Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c02884
Keywords
cobalt-based electrocatalysts; melamine; g-C3N4; oxygen reduction reaction; fuel cells
Funding
- National Key R&D Program of China [2016YFB0301600]
- National Natural Science Foundation of China
- Fundamental Research Funds for the Central Universities [JD1716, 12060093063]
- China Scholarship Council
- European Union (ERDF)
- Region Nouvelle Aquitaine
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A series of cobalt-based multicomponent electrocatalysts (Co-Cat-T) for the oxygen reduction reaction (ORR) were synthesized by thermal pyrolysis of activated carbon-supported cobalt and melamine mixture from 500 to 800 degrees C. Their corresponding electrocatalytic performance was systematically investigated toward ORR in an alkaline electrolyte. The electrocatalyst chemical composition and structure evolution (e.g., microstrain, crystallite size, and cell volume) were confirmed by X-ray diffraction Rietveld analyses. The material generated at 550 degrees C (Co-Cat-T550) showed the largest cell volume of the C3N4 phase with a crystallite size of 4.1 +/- 0.1 nm. Independent of the heat-treatment temperature, the cobalt atom was coordinated to nitrogen moieties. The following findings: cobalt inserted in the carbon nitride framework (Co-g-C3N4), abundant Co-N-x and pyridinic-N species, unique encapsulated cross-tubular structure, and disordered carbon domains performed better in the ORR with Co-Cat-T550 among the obtained electrocatalysts. In addition, Co-Cat-T550 showed performance comparable to Pt/C in an alkaline hydrogen/oxygen microfuel cell platform.
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