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An ultrahigh electron-donating quaternary-N-doped reduced graphene oxide@carbon nanotube framework: a covalently coupled catalyst support for enzymatic bioelectrodes

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Abstract

Carbonaceous materials are currently the most extensively researched materials as catalyst supports for enzymatic biofuel cells (EBFCs). N-doping is an extremely effective strategy to tailor the unique electronic properties of carbon materials. However, the coexistence of electron-accepting pyridinic- and pyrrolic-N with electron-donating quaternary-N weakens the n-type behavior, resulting in lower electron mobility than that of pristine graphene, thus impacting a range of device applications. Herein, we demonstrate a covalently coupled ultrahigh quaternary-N-doped reduced graphene oxide/carbon nanotube (QN-rGO@CNT) network through electrostatic interaction as a novel enzyme support for EBFCs. It is found that N bond types are controllable via thermal treatment, and the as-made QN-rGO@CNT composite with an interconnected porous structure, covalent coupling, and ultrahigh electron-donating quaternary-N-doping exhibits superior electrochemical properties. As a result, the present glucose/O2 EBFCs equipped with enzyme-functionalized QN-rGO@CNT electrodes can deliver a high open circuit potential of 0.89 V, a short-circuit current density of 2.25 mA cm−2 and a maximum power density of 0.9 mW cm−2. Using the high-throughput fabrication method reported in this work, the monotype N-doped carbon hybrid can be commercially utilized as a promising supporting electrode in BFC applications.

Graphical abstract: An ultrahigh electron-donating quaternary-N-doped reduced graphene oxide@carbon nanotube framework: a covalently coupled catalyst support for enzymatic bioelectrodes

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Publication details

The article was received on 21 Jan 2019, accepted on 01 Apr 2019 and first published on 05 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA00771G
Citation: J. Mater. Chem. A, 2019, Advance Article

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    An ultrahigh electron-donating quaternary-N-doped reduced graphene oxide@carbon nanotube framework: a covalently coupled catalyst support for enzymatic bioelectrodes

    G. Li, Z. Li, X. Xiao, Y. An, W. (. Wang and Z. Hu, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA00771G

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