Abstract
The increasing demand for sustainable energy storage devices has driven the research on redox-active biosourced materials. Quinone-based tannins are present in the waste of the forest industry. Here we report a study on two molecules belonging to the tannin family, tannic acid (TA) and catechin (Ctn). An increase in the energy density of 835% for Ctn on activated carbon paper current collectors, in symmetrical configuration has been observed in aqueous electrolyte. Interestingly, in galvanostatic conditions, the surface of the carbon current collector undergoes changes that increase its capacity by two orders of magnitude. The resulting synergistic effect of the activation of the carbon surface and presence of redox active tannins is beneficial for the performance of the storage device. Work is in progress to improve the device cyclability (stability).
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