0.30 g of PTFE was added 25 mL of ethanol. The solution was mixed and sonicated for 10 min to obtain a homogeneous mixture. 3.0 g of activated carbon, 0.37 g gluten, and 0.30 g 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 10 min. The resulting dough was hot-pressed between two steel plates at 10,000 pounds and 50 o C to obtain about 1 mm thick electrodes.