Bottom-up wet-chemical synthesis of a two-dimensional porous carbon material with high supercapacitance using a cascade coupling/cyclization route

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Xu, Yongjie and Sprick, Reiner Sebastian and Brownbill, Nick J. and Blanc, Frédéric and Li, Qingyin and Ward, John W. and Ren, Shijie and Cooper, Andrew I. (2021) Bottom-up wet-chemical synthesis of a two-dimensional porous carbon material with high supercapacitance using a cascade coupling/cyclization route. Journal of Materials Chemistry A, 9 (6). pp. 3303-3308. ISSN 2050-7488 (https://doi.org/10.1039/d0ta11649a)

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Abstract

Wet-chemical bottom-up synthesis methods for two-dimensional (2D) layered materials are less explored than the top-down exfoliation of bulk materials. Here, we set out to synthesize a graphyne-type material by a wet-chemical synthesis method using Sonogashira-Hagihara cross-coupling polycondensation of a multifunctional monomer,2, bearing alkyne and vinyl bromide functionalities. Spectroscopic and chemical analysis revealed that upon C-C bond formation, an unanticipated Bergman cyclization occurred to give an aromatic 2D porous carbon material (2D-PCM).2D-PCMis a black material with graphene-like layers and a bulk structure that is similar to irregular graphite. It is porous with a hierarchical pore structure and an apparent Brunauer-Emmett-Teller surface area of 575 m2g−1. The material has excellent electrochemical performance as an electrode in supercapacitors with a specific capacitance of 378 F g−1at the current density of 0.1 A g−1, which surpasses state-of-the-art carbon materials, suggesting that wet-chemical methods might give functional benefits over top-down processing routes.

ORCID iDs

Xu, Yongjie, Sprick, Reiner Sebastian ORCID logoORCID: https://orcid.org/0000-0002-5389-2706, Brownbill, Nick J., Blanc, Frédéric, Li, Qingyin, Ward, John W., Ren, Shijie and Cooper, Andrew I.;
CORE (COnnecting REpositories)