Electrochemical Deposition of γ-MnO2 on Ag/rGO Hybrid Films as Flexible Electrode Materials for Asymmetric Supercapacitor

Electrochemical Deposition of γ-MnO2 on Ag/rGO Hybrid Films as Flexible Electrode Materials for Asymmetric Supercapacitor

The fl exible electrodes are the essential components for fabricating modern fl exible supercapacitors. In this study, a compositehybrid fi lm integrated with silver nanoparticles (Ag NPs), reduced graphene oxide (rGO) and γ-MnO 2 nanorods asa fl exible electrode has been developed by the electrochemical deposition method. The substrate (rGO) of the electrode notonly provides mechanical stability but also ensures fast electron transfer during charge–discharge. The Ag NPs distributedin electrode provide the electronic channel to enhance the electric conductivity. The γ-MnO 2 electroplated on the surface ofhybrid fi lms further improved the electrochemical performance of them. The resultant γ-MnO 2 /Ag/rGO hybrid fi lms exhibita high specifi c capacitance of 1090.3 F g −1 at current density of 0.3 A g −1 . The asymmetric supercapacitor (ASC) deviceswere further fabricated by γ-MnO 2 /Ag/rGO fi lms as anode and AC/rGO fi lms as cathode electrodes within a wide operatingvoltage of 0–1.7 V. The energy density of obtained ASC devices was 71.8 Wh kg −1 at a power density of 279.4 W kg −1 .

The fl exible electrodes are the essential components for fabricating modern fl exible supercapacitors. In this study, a compositehybrid fi lm integrated with silver nanoparticles (Ag NPs), reduced graphene oxide (rGO) and γ-MnO 2 nanorods asa fl exible electrode has been developed by the electrochemical deposition method. The substrate (rGO) of the electrode notonly provides mechanical stability but also ensures fast electron transfer during charge–discharge. The Ag NPs distributedin electrode provide the electronic channel to enhance the electric conductivity. The γ-MnO 2 electroplated on the surface ofhybrid fi lms further improved the electrochemical performance of them. The resultant γ-MnO 2 /Ag/rGO hybrid fi lms exhibita high specifi c capacitance of 1090.3 F g −1 at current density of 0.3 A g −1 . The asymmetric supercapacitor (ASC) deviceswere further fabricated by γ-MnO 2 /Ag/rGO fi lms as anode and AC/rGO fi lms as cathode electrodes within a wide operatingvoltage of 0–1.7 V. The energy density of obtained ASC devices was 71.8 Wh kg −1 at a power density of 279.4 W kg −1 .