Enhanced gravimetric capacitance of CeO2 by compositing with the hybridized phase of MoS2

The low electrical conductivity of CeO 2 hinders its gravimetric capacitance (C S ) despite its good redox property. Therefore, this work aims to improve the gravimetric capacitance of CeO 2 , by compositing it with a suitable material. Here, the oxygen-incorporated 1T/2H hybrid MoS 2 is composited with CeO 2 (CeO 2 /O-MoS 2 ), as it improves the electrical conductivity and C S . This is evident from the enhanced gravimetric capacitance value of 429.41 F/g at 0.5 A/g in 0.5 M of H 2 SO 4 by the CeO 2 /O-MoS 2 composite, compared to the low value of 87.76 F/g of pristine CeO 2 . The lower electrochemical impedance values of the composite concur with the enhanced gravimetric capacitance of the composite, compared to the pristine CeO 2 . The same composite in a symmetric two-electrode system at 0.5 A/g showed a gravimetric capacitance value of 167.37 F/g with 95.49% capacitance retention after 4000 cycles at 10 A/g in 0.5 M of H 2 SO 4 .