Preparation of Pore-Size Controllable Activated Carbon from Rice Husk Using Dual Activating Agent and Its Application in Supercapacitor

Table 4

Functional groups on the surface of AC samples by Boehm titration.

Sample	Functional groups (mmol g^−1)
	Carboxylic	Phenolic	Lactonic	Acidic site	Basic site
RH-K1N2	0.500	0.850	0.250	1.600	0.630
RH-K1.5N2	0.495	0.397	0.495	1.387	0.693
RH-K2N1	0.350	0.550	0.600	1.500	0.690
RH-K2N1.5	0.260	0.990	0.521	1.771	0.704
RH-K2N2	0.445	0.595	0.545	1.585	0.346