In Situ Magnetic Resonance Imaging of a Complete Supercapacitor Giving Additional Insight on the Role of Nanopores.
Ghenima OukaliElodie SalagerMohamed Ramzi AmmarCharles-Emmanuel DutoitVincent Sarou-KanianPatrice SimonEncarnación Raymundo-PiñeroMichaël DeschampsPublished in: ACS nano (2019)
Nuclear magnetic resonance is one of the rare techniques able to probe selectively the ions inside the nanoporous network in supercapacitor devices. With a magnetic 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 in industry. 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.
Keyphrases
- solid state
- magnetic resonance imaging
- reduced graphene oxide
- quantum dots
- magnetic resonance
- contrast enhanced
- cell cycle
- photodynamic therapy
- aqueous solution
- computed tomography
- gold nanoparticles
- metal organic framework
- molecular dynamics simulations
- ionic liquid
- cell proliferation
- diffusion weighted imaging
- single molecule