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Issue 3, 2019
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Integrating MXene nanosheets with cobalt-tipped carbon nanotubes for an efficient oxygen reduction reaction

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Abstract

The oxygen reduction reaction (ORR) plays a key role in many renewable energy conversion and storage technologies. As the state-of-the-art ORR electrocatalysts, Pt-based electrocatalysts suffer from high price, low earth abundance and poor stability. Developing high performance noble-metal-free ORR electrocatalysts as alternatives for Pt is highly desirable but still remains a significant challenge. In this work, we reported a metal–organic-framework-engaged strategy for the fabrication of cobalt-tipped carbon nanotube/Ti3C2 nanosheet composites (Co-CNT/Ti3C2), in which ZIF-67 particles were in situ grown on Ti3C2 nanosheets and then were converted to cobalt-tipped carbon nanotubes through a pyrolysis process. The Ti3C2 nanosheets not only served as two-dimensional conductive scaffolds for the growth of Co-CNTs but also balanced the tradeoff between graphitization of carbon and the surface area. Benefiting from the abundant Co–N/C active sites, reasonably high graphitization of carbon and suitable surface areas, the optimized Co-CNT/Ti3C2 manifested comparable ORR activity (half-wave potential of 0.82 V and diffusion-limiting current density of 5.55 mA cm−2) but superior stability to commercial Pt/C (half-wave potential of 0.82 V and diffusion-limiting current density of 5.30 mA cm−2), providing great opportunity for its application in renewable conversion and storage technologies.

Graphical abstract: Integrating MXene nanosheets with cobalt-tipped carbon nanotubes for an efficient oxygen reduction reaction

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Publication details

The article was received on 03 Nov 2018, accepted on 10 Dec 2018 and first published on 11 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10574J
Citation: J. Mater. Chem. A, 2019,7, 1281-1286

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    Integrating MXene nanosheets with cobalt-tipped carbon nanotubes for an efficient oxygen reduction reaction

    J. Chen, X. Yuan, F. Lyu, Q. Zhong, H. Hu, Q. Pan and Q. Zhang, J. Mater. Chem. A, 2019, 7, 1281
    DOI: 10.1039/C8TA10574J

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