Pseudocapacitance Effect Related with Hydrogen Electrosorbed in Carbon

5 Pseudocapacitance Effect Related with Hydrogen Electrosorbed in Carbon 

The overall charge/discharge phenomenon is summarized as follows  

In the process of hydrogen insertion into the carbon network, it seems that especially defective domains can adsorb hydrogen more preferably (Fig. 9.14). However, the filling of graphene layers through an intercalation phenomenon is still controversial. 

For understanding the mechanism of hydrogen electrosorption, various techniques must be used. Cyclic voltammetry is a well adapted electrochemical technique to elucidate the mechanism and kinetics of reversible hydrogen storage. An example of voltammetry characteristics using a microporous activated carbon cloth from viscose (AC 5bet = 1390 m /g) in 6 mol/L KOH is shown in Fig. 9.15. 

For comparison, the voltammetry characteristics (5 mV/s) performed on the multiwalled carbon nanotubes in the same way as for the activated carbon cloth are shown in Fig. 9.16. 

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