Carbon-Encapsulated Co Nanoparticle and Hollow Carbon Sphere Composites as High-Performance Catalysts for Oxygen Reduction Reaction
JOURNAL OF PHYSICAL CHEMISTRY C(2023)
摘要
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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