Double redox aqueous capacitor with high energy output

• Post by: nfp
• 01/03/2023
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The paper puts forward the concept of double redox electrochemical capacitor operating in an aqueous electrolyte. It combines the redox activity of sulphur from Bi₂S₃ nanocrystals combined with the reactions of iodides which take place at opposite electrode. This combination effectively boosts the capacitance (275 F g^-1), and the energy density of the device thanks to relatively high cell voltage of 1.5 V. The device retains 73% of its capacitance at 10 A g-1 of discharge current. The different states of the redox species ensure their operation at separate electrodes in an immiscible manner without a shuttling effect. The specific interactions of the redox active species with carbon electrodes are supported by operando Raman spectroscopy.

Full article here.

NFP Research Area: Nanomaterials for energy, environment and safety: Nanomaterials For Solar Energy Harvesting