Evaluation of Graphene/WO3 and Graphene/CeO x Structures as Electrodes for Supercapacitor Applications

Table 2 Results from the electrochemical characterization of the different hybrid electrodes

Sample	Capacitance (mF/cm²)	Capacitance retention (1000 cycles)	Charge/discharge efficiency (%, after 900 cycles)	Charge/discharge time (s)
1-layer Gr	0.87	–	–	1.7
1-layer Gr/CeO₂	1.27	90	38	1.7
3-layer Gr/CeO₂	4.55	98	60	4.7
1-layer Gr/WO₃	2.69	48	50	1.9
3-layer Gr/WO₃	4.15	95	40	5.5