Abstract
A novel layer-by-layer (LBL) based electrode material for supercapacitor consists of polypyrrole/graphene oxide and polypyrrole/manganese oxide (PPy/GO|PPy/MnO2) has prepared by electrochemical deposition. The formation of LBL assembled nanocomposite is confirmed by Fourier transform infrared spectroscopy, Raman spectroscopy and X-ray diffraction. The field emission scanning electron microscopy images clearly showed that PPy/MnO2 was uniformly coated on PPy/GO. The PPy/GO|PPy/MnO2 symmetrical supercapacitor has revealed outstanding supercapacitive performance with a high specific capacitance of 786.6 F/g, an exceptionally high specific energy of 52.3 Wh/kg at a specific power of 1392.9 W/kg and preserve a good cycling stability over 1000 cycles. It is certain that PPy/GO|PPy/MnO2 has an extraordinary perspective as an electrode for future supercapacitor developments. This finding contributes to a significant impact on the evolution of electrochemical supercapacitor.
Highlights
The search and strong demand for long-lasting energy security is mainspring for the development of energy storage systems
High specific energy can be achieved by making a device with high supercapacitive properties, which is usually achieved by materials that go through faradaic reactions
These results indicate that contribution of LBL assembled PPy/graphene oxide (GO)|PPy/MnO2 on promising Csp, specific energy and specific power and improves the stability of the composite which significantly decreases the destruction of electroactive materials[40] and significantly improves the stability during doping/dedoping process
Summary
The LBL assembled composite spectrum (Fig. 2c) shows the peaks approximately similar to the combination of vibration peaks of PPy/GO and PPy/MnO2 composites. In the spectrum of LBL assembled composite (Fig. 3c), all the characteristic peaks of PPy/MnO2 and PPy/GO clearly appear. The X-ray analysis for the LBL assembled composite (Fig. 4c) shows all the characteristic peaks of PPy, GO and MnO2, confirming the LBL composite are made up of PPy/GO and PPy/MnO2. Single layer composites, PPy/GO (10.12 W/kg) and PPy/MnO2 (39.83 W/kg) at specific power of 1232.74 Wh/kg and 1425.39 Wh/kg, respectively This indicates that properties of LBL assembled composite give significant effect in the energy performance by combining active materials of PPy/GO and PPy/MnO2.
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