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Transparent and flexible supercapacitors (TFSCs) as indispensable components for future transparent and flexible electronics have attracted significant interests. The Ag nanowires/poly(ethylene terephthalate) (PET) transparent conductive electrodes (TCEs) exhibit strong competitiveness applied in the TFSCs due to the exceptional conductivity and transparency. However, the environmental tolerance of Ag nanowires such as oxidation and sulfurization limits the reliability. Herein, electric-double-layer TFSCs based on Ag nanowires/PET TCEs as current collectors are reported. More importantly, a seamless, uniform, and flexible graphene layer behaves as armored and active components simultaneously for the TFSCs, by a facile electrodeposition process. On the one hand, the flexible graphene layer can isolate the Ag nanowires away from the oxidation well, particularly in the condition of electrolyte. On the other hand, the laminated graphene layer with wrinkles can store electrons, and the copercolating network of graphene layer and Ag nanowires can transport the electrons efficiently, cyclically accomplishing the operation of storage and transport, by which the synergistic effect endows the TFSCs with decent optical and electrochemical performances. The interfacial capacitance is evaluated to discuss the relationship between the structure of graphene layer and the measured capacitance. This facile process provides a rational architecture and insights into TFSCs.

TiO2 nanoparticle with good dispersibility and stability in transformer oil was prepared and used to modify insulating property of aged oil. It was found that space charge decay rate in the modified aged oil can be significantly enhanced to 1.57 times of that in the aged oil at first 8 s after polarization voltage was removed. The results of trap characteristics reveal that the modification of nanoparticle can not only greatly lower the shallow trap energy level in the aged oil but also increase the trap density, resulting in improved charge transportation via trapping and de-trapping process in shallower traps.

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