Raman Spectroscopy Measurements Support Disorder-Driven Capacitance in Nanoporous Carbons

作者：Xinyu Liu, Jaehoon Choi, Zhen Xu, Clare P. Grey, Simon Fleischmann, Alexander C. Forse · 发表于：Journal of the American Chemical Society · 年份：2024 · DOI：10.1021/jacs.4c10214 · 被引用次数：178 · 研究领域：Supercapacitor Materials and Fabrication、Advancements in Battery Materials、Electrocatalysts for Energy Conversion

High Resolution Image Download MS PowerPoint Slide 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 the findings from NMR that smaller graphene-like domains correlate with larger capacitances. This study supports our finding that disorder is a key metric for high capacitance in nanoporous carbons and shows that Raman spectroscopy is a powerful technique that allows rapid screening to identify nanoporous carbons with superior performance in supercapacitors.