Communication Dans Un Congrès Année : 2025

Impact of aryldiazonium salts grafting onto porous carbon as electrodes for supercapacitors

Résumé

New materials are constantly emerging to respond to the desire of having more performant energy storage devices. Among all energy storage devices, supercapacitors also called electrochemical capacitors, have the ability of quickly accumulating charges but lack the important energy density of batteries 1 . Therefore, different types of carbon materials, including graphite, soft and hard carbon as well as nanocarbon, have been investigated to improve the energy storage of such devices, batteries and fuel cells 2 . Surface modification through diazonium salts is a well-known technique for the grafting of molecules on carbons. The covalent attachment of electroactive molecules onto carbon can allow an increase of the capacitance by adding faradaic process to the double layer capacitance of the electrodes. It can also permit to expand the voltage window of the devices to obtain a better energy density which is one of the goals of research in supercapacitors. However, grafting molecules on porous carbon has some drawbacks such as the poor stability of the grafted molecules upon cycling and sometimes the lack or poor increase of the capacity of the device due to pores blockage by the molecules. In this study, we performed the grafting of anthraquinone using diazonium chemistry. Quinones are involved in two electrons exchange redox process that allow to reach higher capacities with less grafted molecules. They are also environmentally friendly, low cost and abundant molecules 3 . Different soft porous carbons 4 , including one carbon aerogel, were used to study the grafting of anthraquinone. Depending on the type of porous carbon and the grafting protocol, we observe that the electrodes made with grafted material do not exhibit the same performances. Each subtract was analyzed by electrochemistry, elemental analyses and spectroscopies to investigate the impact of the grafting on the carbon. This works provides a better understanding of the influence of the porous carbon nature on the grafting of anthraquinone.

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Dates et versions

hal-05392920 , version 1 (09-12-2025)

Identifiants

  • HAL Id : hal-05392920 , version 1

Citer

Célia Clementz, Sandrine Berthon-Fabry, Phillipe Hapiot, Lagrost Corinne, Yann Leroux. Impact of aryldiazonium salts grafting onto porous carbon as electrodes for supercapacitors. International Society of Electrochemistry, Ulrike Krewer; Gunther Wittstock, Sep 2025, Mainz, Germany, Germany. ⟨hal-05392920⟩
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