Electrode Fabrication: The electrode film preparation followed the traditional method used for activated carbons. The electrode films were made with a ratio of YP50F:PTFE of 95:5 wt%. An activated carbon YP50F (200 mg, Kuraray) and ethanol (ca. 2 mL, VWR Chemicals) mixture was sonicated for 10 minutes. PTFE (60 wt% in water) (17.5 mg, Sigma-Aldrich) was added to a watch glass with a few drops of ethanol and the sonicated solution was added to this. This was stirred by hand for 15 minutes and then the dry parts were slowly incorporated to form a black material with chewing gum-like consistency. Once all the ethanol had evaporated, this was then kneaded with a spatula for 5 minutes with drops of ethanol added periodically to prevent the material from drying out. This was rolled out to a thin film and then dried at 100 °C under dynamic vacuum for at least 24 hours.