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Co-intercalation of Multiple Active Units in Graphene by Pyrolysis of Hydrogen-bonded Precursors for Zinc–air Batteries and Water Splitting

Abstract

Multifunctional electrocatalysts enabled electrochemical hydrogen/oxygen redox play 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 in one material. Herein, we presented a general protocol by a controllable pyrolysis/vapor reforming process, which allows for reconsitution to form CoNC nano-units, while reserving Co and Co oxides simultaneously. The material by co-intercalation of these active units in 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 half-wave potential for oxygen reduction reaction is 0.81 V, outperforming most of state-of-the-art trifunctional electrocatalysts. A maximum power density of 23 mW cm-2 and stable 1000 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 exploring other efficient multifunctional electrocatalysts towards the application in renewable energy technologies.

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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, Accepted Manuscript
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    Co-intercalation of Multiple Active Units in 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, Accepted Manuscript , DOI: 10.1039/C7TA06677E

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