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Cobalt Single-Atoms Anchored on Porphyrinic Triazine-based Frameworks as Bifunctional Electrocatalysts for Oxygen Reduction and Hydrogen Evolution Reactions

Abstract

Designing and fabrication of highly active single-atom catalysts (SACs) with maximized atomic efficiency is highly desirable but still remains a great challenge. Herein, highly active and stable cobalt single-atoms with a Co-N4 moiety were uniformly anchored on a porous porphyrinic triazine-based framework (CoSAs/PTF) by a simple ionothermal method. Due to the abundant single-atom Co-N4 species, the hierarchical porous structure and the good conductivity, the resultant catalyst is highly active for the electrocatalytic oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER). For ORR, a more positive half-wave potential of 0.808 V (vs. RHE) was achieved, compared with the commercial benchmark Pt/C (0.806 V). Furthermore, a small onset potential of 21 mV and a low Tafel slope of 50 mV per decade was obtained for HER. The porphyrin-like structure was found to stabilize the CoSAs effectively, thus leading to long-term durability and remarkable methanol-tolerant behavior. This bifunctional single-atom catalyst might be a promising candidate to replace the Pt-based electrocatalysts in water splitting and fuel cells.

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Publication details

The article was received on 01 Oct 2018, accepted on 30 Nov 2018 and first published on 07 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA09490J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Cobalt Single-Atoms Anchored on Porphyrinic Triazine-based Frameworks as Bifunctional Electrocatalysts for Oxygen Reduction and Hydrogen Evolution Reactions

    J. Yi, R. Xu, G. Chai, T. Zhang, K. Zang, B. Nan, H. Lin, Y. Liang, J. Lv, J. Luo, R. Si, Y. Huang and R. Cao, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA09490J

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