Dependence on cation size of thermally induced capacitive effect of a nanoporous carbon

摘要

Nanoporous carbon based thermally chargeable supercapacitors (TCS) are characterized in a set of experiments for low-grade heat harvesting and storage. A TCS consists of two nanoporous electrodes immersed in an electrolyte solution. When the temperature of one of the electrodes rises, its electrode potential increases, and a significant amount of thermal energy is converted to electric energy. The temperature sensitivity of the electrode potential (|dV/dT|) is highly dependent on the cation size: with everything else being the same, as the cation diameter (d) decreases, |dV/dT| increases.