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Molecular interaction balanced one- and two-dimensional hybrid nanoarchitectures for high-performance supercapacitors

Lu, Mingxia, Wang, Gang, Li, Bo, Chen, Jing, Zhang, Jingchao, Li, Zhe and Hou, Bo 2019. Molecular interaction balanced one- and two-dimensional hybrid nanoarchitectures for high-performance supercapacitors. Physical Chemistry Chemical Physics 21 (40) , pp. 22283-22292. 10.1039/C9CP04579A

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Hybridisation of one-dimensional (1D) and two-dimensional (2D) materials to enhance charge storage has received considerable attention, but a fundamental understanding of the inherent ratio-dependent charge transfer mechanisms associated with the modulation of their molecular interactions is still within the community. Herein, we examined 1D surface oxidised carbon nanotubes (Ox-CNTs) and 2D reduced graphene oxide (rGO) to understand their ratio-dependent charge transfer and molecular interaction dynamics. We found that stepwise ultrasonication and the self-assembly process can control the thermodynamic molecular interactions, which result in rGO and Ox-CNT suspensions not only well dispersed in N,N-dimethylformamide but also self-organised into sandwiched nanoarchitectures. We reveal that the enhanced charge storage performance originated from the Ox-CNT-mediated low contact resistance between the active material and the current collector, and the incorporation of rGO leads to a significant ion diffusion coefficient and gives rise to numerous ion diffusion channels for high rate retention. Through a systematic electrochemical characterisation, we found that the GC5 : 5 hybrids (mass ratio of rGO to Ox-CNT) provide the best compromise-balance ratio between rGO and Ox-CNT for realising a champion energy density (9 W h kg−1) and power density (10 kW kg−1) beyond the state-of-the-art performance of the individual materials. Our results herald the advent of molecular level hybridisation of 1D–2D materials for high-performance electrochemical energy storage.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Royal Society of Chemistry
ISSN: 1463-9076
Date of First Compliant Deposit: 19 February 2020
Date of Acceptance: 23 September 2019
Last Modified: 26 Nov 2020 08:29

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