In Situ Magnetic Resonance Imaging of a Complete Supercapacitor Giving Additional Insight on the Role of Nanopores

Ghenima Oukali (1, 2) , Elodie Salager (1, 2) , Mohamed Ramzi Ammar (2) , Charles-Emmanuel Dutoit (1, 2) , Vincent Sarou-Kanian (1, 2) , Patrice Simon (1, 3) , Encarnacion Raymundo-Piñero (1, 2) , Michaël Deschamps (1, 2)

1 RS2E - Réseau sur le stockage électrochimique de l'énergie
2 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Nuclear magnetic resonance is one of therare techniques able to probe selectively the ions inside thenanoporous network in supercapacitor devices. With amagnetic resonance imaging method able to detect all ions(adsorbed and nonadsorbed), we record one-dimensionalconcentration profiles of the active ions in supercapacitorswith an electrode configuration close to that used inindustry. Larger anionic concentration changes are probedupon charge and discharge in a carbide-derived carbon(CDC) with micropores smaller than 1 nm compared to aconventional nanoporous carbon (CC) with a largerdistribution of pore sizes, up to 2 nm. They highlight theincreased interaction of the anions with CDC and provide a better understanding of the enhanced capacitance in CDC-based supercapacitors.

Mots clés: Supercapacitor; Nanopor; Carbon; Nuclear magnetic resonance; Magnetic resonance imaging

Domaines: Matériaux; Energie électrique; Matériaux

Ghenima Oukali, Elodie Salager, Mohamed Ramzi Ammar, Charles-Emmanuel Dutoit, Vincent Sarou-Kanian, et al.. In Situ Magnetic Resonance Imaging of a Complete Supercapacitor Giving Additional Insight on the Role of Nanopores. ACS Nano, 2019, 13 (11), pp.12810-12815. ⟨10.1021/acsnano.9b04998⟩. ⟨hal-02521896⟩