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Issue 39, 2017
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Co-intercalation of multiple active units into graphene by pyrolysis of hydrogen-bonded precursors for zinc–air batteries and water splitting

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Abstract

Multifunctional electrocatalyst enabled electrochemical hydrogen/oxygen redox plays pivotal roles in variable energy conversion/storage devices and some coupling devices. The daunting challenge in developing multifunctional electrocatalysts at present is to effectively incorporate multiple active sites into one material. Herein, we presented a general protocol by a controllable pyrolysis/vapor reforming process, which allows for reconstitution to form CoNC nano-units, while preserving Co and Co oxides simultaneously. The material by co-intercalation of these active units into graphene generates outstanding trifunctional activities. The overpotentials for hydrogen and oxygen evolution reactions are 205 and 360 mV (at 10 mA cm−2), respectively, and the half-wave potential for the oxygen reduction reaction is 0.81 V, outperforming most of the state-of-the-art trifunctional electrocatalysts. A maximum power density of 23 mW cm−2 and 1000 stable cycles were realized in the as-prepared material equipped Zn–air battery. This battery further drove overall water splitting for 24 hours, at a faradaic efficiency of ca. 100% and gas production rate of 0.035 and 0.017 mL min−1 for hydrogen and oxygen, respectively. Thus this work offers a general approach to explore other efficient multifunctional electrocatalysts for application in renewable energy technologies.

Graphical abstract: Co-intercalation of multiple active units into graphene by pyrolysis of hydrogen-bonded precursors for zinc–air batteries and water splitting

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Publication details

The article was received on 29 Jul 2017, accepted on 05 Sep 2017 and first published on 05 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06677E
Citation: J. Mater. Chem. A, 2017,5, 20882-20891
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    Co-intercalation of multiple active units into graphene by pyrolysis of hydrogen-bonded precursors for zinc–air batteries and water splitting

    Y. Huang, Q. Liu, J. Lv, D. D. Babu, W. Wang, M. Wu, D. Yuan and Y. Wang, J. Mater. Chem. A, 2017, 5, 20882
    DOI: 10.1039/C7TA06677E

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