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Fullerene-metalloporphyrin co-crystal as efficient oxygen reduction reaction electrocatalyst precursor for Zn–air batteries
Carbon Future
Published: 26 February 2024
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Fullerene-derived carbon materials are promising catalysts for the oxygen reduction reaction (ORR) because of the presence of intrinsic defects in the carbon cage. Moreover, the N species and metallic catalytic sites can effectively overcome the sluggish kinetics of O2 activation. In this work, a rod-shaped tetraphenyl-porphyrin cobalt–C60 cocrystal (CoTPP/C60) was self-assembled and then annealed to prepare a series of N, Co-codoped carbon materials. Among the resulting CoTPP/C60-X materials, CoTPP/C60-800, which was obtained at 800 °C, demonstrated a half-wave potential of 0.824 VRHE, outstanding stability, and remarkable methanol tolerance. The superior ORR performance of CoTPP/C60-800 can be attributed to the presence of abundant defects, appropriate nitrogen (N) species (pyridine N and graphitic N), Co–Nx sites, and Co nanoparticles. Moreover, a Zn–air battery assembled using CoTPP/C60-800 as the cathode exhibited a high power density of 111.7 mW∙cm−2. This study provides a new strategy for designing and synthesizing advanced ORR catalysts for Zn–air batteries.

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