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A new C=C embedded porphyrin sheet with superior oxygen reduction performance

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Abstract

C2 is a well-known pseudo-oxygen unit with an electron affinity of 3.4 eV. We show that it can exhibit metal-ion like behavior when embedded in a porphyrin sheet and form a metal-free two-dimensional material with superior oxygen reduction performance. Here, the positively charged C=C units are highly active for oxygen reduction reaction (ORR) via dissociation pathways with a small energy barrier of 0.09 eV, much smaller than that of other non-platinum group metal (non-PGM) ORR catalysts. Using a microkinetics-based model, we calculated the partial current density to be 3.0 mA/cm2 at 0.65 V vs. a standard hydrogen electrode (SHE), which is comparable to that of the state-of-the-art Pt/C catalyst. We further confirm that the C=C embedded porphyrin sheet is dynamically and thermally stable with a quasi-direct band gap of 1.14 eV. The superior catalytic performance and geometric stability make the metal-free C=C porphyrin sheet ideal for fuel cell applications.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Peking University, Beijing, 100871, China

    Yawei Li, Jiabing Yu & Qiang Sun

  2. Center for Applied Physics and Technology, Peking University, Beijing, 100871, China

    Shunhong Zhang, Qian Wang & Qiang Sun

  3. Department of Physics, Virginia Commonwealth University, Richmond, VA, 23284, USA

    Qiang Sun & Puru Jena

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  1. Yawei Li
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Li, Y., Zhang, S., Yu, J. et al. A new C=C embedded porphyrin sheet with superior oxygen reduction performance. Nano Res. 8, 2901–2912 (2015). https://doi.org/10.1007/s12274-015-0795-x

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