Impurity Effects on Charging Mechanism and Energy Storage of Nanoporous Supercapacitors

摘要: Room-temperature ionic liquids (RTILs) have been widely used as electrolytes to enhance the capacitive performance of electrochemical capacitors also known supercapacitors. Whereas impurities are ubiquitous in RTILs (e.g., water, alkali salts, and organic solvents), little is about their influences on behavior devices. In this work, we investigate different within micropores carbon electrodes via classical density functional theory (CDFT). We find that under certain conditions can significantly change charging electric double layers shape differential capacitance curves even at very low concentrations. More interestingly, an impurity with a strong affinity nanopore increase energy beyond critical potential. Our theoretical predictions provide further understanding how affects