Structural disorder determines capacitance in nanoporous carbons - Archive ouverte HAL
Journal Articles Science Year : 2024

Structural disorder determines capacitance in nanoporous carbons

Xinyu Liu
Dongxun Lyu
Xiao Hua
Zhen Xu
Clare P Grey
Alexander C Forse

Abstract

The difficulty in characterizing the complex structures of nanoporous carbon electrodes has led to a lack of clear design principles with which to improve supercapacitors. Pore size has long been considered the main lever to improve capacitance. However, our evaluation of a large series of commercial nanoporous carbons finds a lack of correlation between pore size and capacitance. Instead, nuclear magnetic resonance spectroscopy measurements and simulations reveal a strong correlation between structural disorder in the electrodes and capacitance. More disordered carbons with smaller graphene-like domains show higher capacitances owing to the more efficient storage of ions in their nanopores. Our findings suggest ways to understand and exploit disorder to achieve highly energy-dense supercapacitors.
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hal-04650660 , version 1 (16-07-2024)

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Xinyu Liu, Dongxun Lyu, Céline Merlet, Matthew J A Leesmith, Xiao Hua, et al.. Structural disorder determines capacitance in nanoporous carbons. Science, 2024, 384 (6693), pp.321-325. ⟨10.1126/science.adn6242⟩. ⟨hal-04650660⟩
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