Nanoporous Carbons Obtained Using Various Techniques

10 NANOPOROUS CARBONS OBTAINED USING VARIOUS TECHNIQUES 

According to one of the variants of the technique for preparation of microporous ACs, a mixture of coke with a KOH solution as an activation agent at the ratio of 1 3 was heated in a microwave at 700-900°C. It was shown that the volume of micropores and mesopores grows at an increase in the activation time and the volume of micropores and mesopores practically stops changing after 30 min. 

We can see that the values of specific capacifance and resistance decrease at an increase in current and the potential sweep rate. At w = 20 mV/s, the capacitance 

Carbon electrodes are usually cycled in aqueous solutions in the potential range from 0 to 1V (RHE, reversible hydrogen electrode). Herewith, as pointed out above, average values of specific capacitance of not more than 200 F/g are usually obtained. The lower limit of potentials is because of hydrogen evolution on metallic current taps and the upper limit is related to the oxidative corrosion of carbon. ACs were used in our work of Volfkovich et al. (2012) in studies of electrodes based on AC ADG 

As follows from curve 4 measured in the reversibility range, only EDL charging occurs here, while pseudocapacitance of redox reactions of surface groups is very low in this case. As follows from this curve, the value of EDL capacitance is approximately 170 F/g. 

---