Authors: Huan Yin, Hui Shao, Barbara Daffos, Pierre-Louis Taberna, Patrice Simon.
Journal: Electrochemistry Communications (2022)
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 counter-ion 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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The effects of local graphitization on the charging mechanisms of microporous carbon supercapacitor electrodes