Figure shows the scheme for the synthesis and preparation of the activated carbon electrodes. Briefly, 0.083 g of PTFE was added to 10 mL of ethanol. The solution was mixed and sonicated simultaneously for 10 min to obtain a homogeneous mixture. 0.8 g of activated carbon, 0.1 g of gluten, and 0.05 g of conductive carbon black were added to the PTFE solution. The mixture was covered with Al foil and magnetically stirred at 60-65 o C for 2 h. The temperature was then increased to 80 o C for 30 min to evaporate the remaining solvent. The resulting slurry was transferred onto a glass plate, pressed, and mixed with metal spatulas for 30 min. The obtained dough was processed through a pasta machine (Atlas 150 roller, Marcato) to achieve the desired thickness of the electrodes. The electrodes were cut to the desired size (4 cm 2 ), placed in a vacuum oven at 100 o C and 25 mmHg for 12 h. The same procedure was used to prepare 49 cm 2 electrodes.