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Tannic Acid Mediated Synthesis of Dual-heteroatom Doped Hollow Carbon from Metal-Organic Framework for Efficient Oxygen Reduction Reaction

Abstract

Herein, we report an original strategy to fabricate N/B co-doped hollow carbon (denoted as NB-HC) with the assistance of tannic acid. Inspired by inherent porous structures, we use ZIF-8 as a structural template and N-doping source. Tannic acid (TA) as a secondary material is uniformly coated onto the surface of ZIF-8 to give ZIF-8@TA core−shell composites. The TA-modified shell mediates the post-formation of boron acid-polyol bond, where 1,4-benzenediboronicacid (BDBA) is used as a boron-containing reactant and doping source. After carbonization, the composite successfully turns into hollow N/B co-doped carbon with a high surface area of 936 m2 g-1. It exhibits a pronounced ORR reactivity with onset potential of -0.12 V (vs. Ag/AgCl) in conjunction with superb methanol cross-over tolerance and long-term stability. The first-principles calculation proves that the synergistic effect arising from N and B dopants could create active sites, therefore decreasing the value of free energy change in the rate-determining step. It elucidates that the homogeneously synergistic coupling of B-N in carbon structure and hierarchical porous structures render the as-prepared NB-HC enhanced ORR parameters.

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Publication details

The article was received on 17 Apr 2018, accepted on 15 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8DT01517A
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Tannic Acid Mediated Synthesis of Dual-heteroatom Doped Hollow Carbon from Metal-Organic Framework for Efficient Oxygen Reduction Reaction

    M. Wu, C. Li, J. Zhao, Y. Ling and R. Liu, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT01517A

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