Structure and Properties of a Nanoporous Supercapacitor

Fayon, P. and Thomas, J. M. H. and Trewin, A. (2016) Structure and Properties of a Nanoporous Supercapacitor. The Journal of Physical Chemistry C, 120 (45). pp. 25880-25891. ISSN 1932-7447

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In this paper we have shown through the use of simulated synthesis that the structure of Aza-CMP is an amorphous interpenetrated network. We also show that structural differences, including the nanoporosity, found for Aza-CMP synthesized at different temperatures are due to the differences in melting points and hence miscibility of the reactants. Network bonding errors leave unreacted carbonyl and amine groups that introduce regions of higher network charge and thus are highly favorable binding sites for electrolyte ions. Binding of the electrolyte ions is favorable whether the system is charged or neutral meaning that uptake of electrolyte ions before application of a voltage bias is highly likely. We show that the SO42- electrolyte ion is restricted to the mesoporous regions due to its larger size. In mesoporous and microporous models, SO42- ion diffusion is slow and tortuous, with the possibility that the SO42- ion becomes trapped in pore dead ends. This suggests that the charging mechanism in Aza-CMP supercapacitor electrodes is likely to be dominated by movement of H3O+ electrolyte ions through the nanoporous structure.

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Journal Article
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The Journal of Physical Chemistry C
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22 Jun 2019 08:24
Last Modified:
22 Nov 2022 05:31