Raman Spectroscopy Measurements Support Disorder-Driven Capacitance in Nanoporous Carbons.

ABSTRACT: Our recent study of 20 nanoporous activated carbons showed that a more disordered local carbon structure leads to enhanced capacitive performance in electrochemical double layer capacitors. Specifically, NMR spectroscopy measurements and simulations of electrolyte-soaked carbons evidenced that nanoporous carbons with smaller graphene-like domains have larger capacitances. In this study, we use Raman spectroscopy, a common probe of local structural disorder in nanoporous carbons, to test the disorder-driven capacitance theory. It is found that nanoporous carbons with broader D bands and smaller I_D/I_G intensity ratios exhibit higher capacitance. Most notably, the I_D/I_G intensity ratio probes the in-plane sizes of graphene-like domains and supports

SUBMITTER: Liu X 

PROVIDER: S-EPMC11565708 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature