Oukali, Ghenima and Salager, Elodie and Ammar, Mohamed Ramzi and Dutoit, Charles-Emmanuel and Sarou-Kanian, Vincent and Simon, Patrice and Raymundo-Piñero, Encarnacion and Deschamps, Michaël
In Situ Magnetic Resonance Imaging of a Complete Supercapacitor Giving Additional Insight on the Role of Nanopores.
(2019)
ACS Nano, 13 (11). 12810-12815. ISSN 1936-0851
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(Document in English)
PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 3MB |
Official URL: https://doi.org/10.1021/acsnano.9b04998
Abstract
Nuclear magnetic resonance is one of the rare techniques able to probe selectively the ions inside the nanoporous network in supercapacitor devices. With amagnetic resonance imaging method able to detect all ions(adsorbed and nonadsorbed), we record one-dimensional concentration profiles of the active ions in supercapacitors with an electrode configuration close to that used inindustry. Larger anionic concentration changes are probed upon charge and discharge in a carbide-derived carbon(CDC) with micropores smaller than 1 nm compared to a conventional nanoporous carbon (CC) with a larger distribution of pore sizes, up to 2 nm. They highlight the increased interaction of the anions with CDC and provide a better understanding of the enhanced capacitance in CDC-based supercapacitors.
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