Effects of work function on thermal sensitivity of electrode potential

In recently developed thermally chargeable supercapacitors, temperature dependent capacitive effect is employed to harvest and store low-grade heat as electric energy, for which a key factor dominating the system performance is the thermal sensitivity of electrode potential (dV/dT). In the current study, the influence of electrode material properties, particularly the work function, is analyzed through a set of thermal-to-electric energy conversion experiments. The testing data suggest that dV/dT increases monotonously with the work function. This finding sheds light on electrode materials selection.