A Quasi 2D Flexible Micro-Supercapacitor Based on MnO2//NiCoO4 as a Miniaturized Energy-Storage Device

A miniaturized and flexible asymmetric micro-supercapacitor (ASC) based on surface-modified MnO2 @Au and thin nanosheets of NiCo2O2@Au (termed 2D-qMnO(2)//NiCo2O4 microsupercapacitor) is reported. A lightweight and superior flexible micro-supercapacitor is successfully achieved using conventional microfabrication techniques. The proposed electrodeposition method is very effective for the surface modification and, as a result, uniform and high-quality 2D-quasi MnO2 and NiCo2O4 thin-film formation on a collector current is achieved. The fabricated 2D-qMnO(2)//NiCo2O4 @Au and polymeric gel electrolyte-based micro-supercapacitor has advantageous features. with a high areal capacitance of 5.36 mFcm(2). The 2D-qMnO(2)//NiCo2O4 MSC delivers a high energy density of 0.42 mWhern(-2) at 48.90 mW cm(-2) power density with superior cycling stability (89.62%) over initial 5000 cycles. Impedance analysis showed that the 2D-qMnO(2)//NiCo2O4 MSC device has a phase angle of 73 with an extremely small relaxation time constant of 14 ms. Finally, excellent device performance of the 2D-qMnO(2)//NiCo2O4 MSC under different bending and twisting is demonstrated to evaluate its mechanical flexibility.