An additional series of carbons was synthesised at 750 ℃ and at higher temperatures to explore the above effects further. As the carbons were synthesised under much higher temperatures, shorter carbonisation and activation times were used (1 hour) to increase the yield. The carbons were labelled as "HTC_X_1" with "X" being the carbonisation and activation temperature and "1" representing the time (1 hour). In general, improved capacitances were observed for carbons synthesised at lower temperatures (Figure and).