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Development of high energy density hybrid electrode based on rGO–PMo12 for all-solid state supercapacitors along with actual demonstration of lighting of thirty one LEDs (NEO).

We report the synthesis of hybrid supercapacitor electrodes by a novel reduction of GO with simultaneous incorporation of polyoxometalate. These hybrids show a 30% increase in specific capacitance and excellent stability after 10,000 cycles.

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Herein, we are presenting all-solid-state symmetric supercapacitors (ASSSCs) with an innovative double hybrid strategy, where a hybrid electrode (reduced graphene oxide (rGO) anchored with phoshotungstic acid, rGO-H3PW12O40) is combined with redox-active species (hydroquinone-doped gel electrolyte) doped electrolytes. Initially, a hybrid electrode is fabricated by decorating H3PW12O40 nanodots onto the surface rGO (rGO-PW12). Later, an allsolid state symmetric cell was assembled with rGO-PW12 electrodes and PVA-H2SO4 polymer gel-electrolyte. Interestingly, rGO-PW12 symmetric cell revealed a substantial enhancement in the cell performance as compared to parent rGO systems. It featured a widened potential range of 1.6 V which provides an energy density of 1.05 mWh/ cm3. In order to further improve the performance of rGO-PW12 cell, we have introduced redox-active (hydroquinone) species in to the polymer gel-electrolyte. The performance of rGO-PW12 cell was surprisingly improved with an ultrahigh energy density of 2.38 mWh/cm3 (more than twofold).

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A simple hydrothermal redox reaction between microcrystalline CuOHCl and pyrrole leads to the isolation of striking nanostructures formed by polypyrrole-coated copper nanocables. These multicomponent cables that feature single-crystalline face-centered cubic Cu cores (ca. 300 nm wide and up to 200 μm long) are smoothly coated by conducting polypyrrole, which in addition to its functionality, offers protection against oxidation of the metal core.