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Article Dans Une Revue Electrochemistry Communications Année : 2022

The effects of local graphitization on the charging mechanisms of microporous carbon supercapacitor electrodes

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The electrochemical quartz crystal microbalance (EQCM) technique has been used to study the charge mechanisms in two TiC-derived nanoporous carbons (CDC), synthesized at 800 ℃ and 1100 ℃. These two carbons have a similar pore size and porous volume, but the CDC prepared at 1100 • C shows a more graphitic microstructure. The EQCM study revealed that the charge storage mechanism in the CDC-800 is mainly controlled by a counterion adsorption process, while an expanded ion-exchange process was observed for the CDC-1100. Combined with the potential of zero charge (PZC), these measurements suggest a strong interaction between the anions and graphitic carbon. For the first time, we provide experimental evidence that the local carbon structure affects the charge storage mechanism of the electrical double-layer capacitance in high surface area porous carbons.
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hal-03826626 , version 1 (24-10-2022)

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Huan Yin, Hui Shao, Barbara Daffos, Pierre-Louis Taberna, Patrice Simon. The effects of local graphitization on the charging mechanisms of microporous carbon supercapacitor electrodes. Electrochemistry Communications, 2022, 137, ⟨10.1016/j.elecom.2022.107258⟩. ⟨hal-03826626⟩
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