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Carbon-Encapsulated Co Nanoparticle and Hollow Carbon Sphere Composites as High-Performance Catalysts for Oxygen Reduction Reaction
Nitrogen and cobalt doped carbon materials are promising alternative catalysts for the oxygen reduction reaction (ORR) to replace more expensive Pt-based catalysts. However, the activity and stability of these materials remain largely subpar to those of Pt-based materials. In this work, a N, Co dope...
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Published in: | Journal of physical chemistry. C 2023-12, Vol.127 (51), p.24489-24497 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Nitrogen and cobalt doped carbon materials are promising alternative catalysts for the oxygen reduction reaction (ORR) to replace more expensive Pt-based catalysts. However, the activity and stability of these materials remain largely subpar to those of Pt-based materials. In this work, a N, Co doped carbon composite with a hierarchical structure of few-carbon-layer encapsulated Co nanoparticles attached on hollow carbon spheres was successfully synthesized and demonstrated to have excellent ORR activity and long-term stability in 0.1 M KOH. The optimal catalyst showed a half-wave potential of 0.865 V, and it only shifted negatively by 17 mV after 50000 potential cycles between 0.4 and 1.2 V (vs RHE). These performance markers are better than those of commercial Pt/C catalysts. The high density of accessible active sites, the modification of the electronic structure of Co-Nx active sites and the carbon layer work function, together with the nonplanar active site structure, are potential contributors to such a high performance. |
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ISSN: | 1932-7447 1932-7455 |
DOI: | 10.1021/acs.jpcc.3c05422 |