The hierarchical heterostructure of NiMoO4@NiMnCo2O4 (NMO@NMCO) with furry structures of NMCO jux... more The hierarchical heterostructure of NiMoO4@NiMnCo2O4 (NMO@NMCO) with furry structures of NMCO juxtaposed with NMO nanowires are endowed with multiple electrochemically active and accessible sites for ion storage, thus delivering an ultrahigh specific capacitance of 2706 F g-1, nearly two-fold times greater than that of sole NMCO. Electrodeposition of an overlayer of a highly robust and electrically conducting polymer, poly(3,4-propylenedioxythiophene) (PProDOT), not only improves the energy storage performance but also assists the binary oxide cathode in retaining its structural integrity during redox cycling. Coupling with an anode of porous flaky carbon (FC) derived from groundnut shells results in an asymmetric supercapacitor of FC//PProDOT@NiMoO4@NiMnCo2O4, which delivers an outstanding capacitance of 552 F g-1, energy and power density ranges of 172-40 Wh kg-1 and 0.75-10 kW kg-1, respectively, and a remarkable cycle life of 50 000 cycles, with ∼97.8% capacitance retention, over an operational voltage window of 1.5 V. From an application perspective, the charged supercapacitor was connected to a complementary coloring reversible electrochromic device (ECD) of Prussian blue//PProDOT, and the ECD state transformed from a pale-blue to a deep blue hue, thus signaling the efficient utilization of energy stored in the supercapacitor. The energy-saving attribute of the ECD was realized in terms of an integrated visible-light modulation of 39% that accompanied the optical transition. Deployment of low-cost devices at homes and commercial spaces, capable of storing and saving energy, is the way forward, and this is one significant step in this direction.
Abstract Zinc cobaltite(ZnCo2O4) micro-star shaped porous superstructure, on coating with zinc ox... more Abstract Zinc cobaltite(ZnCo2O4) micro-star shaped porous superstructure, on coating with zinc oxide(ZnO) nano-stubs, and coupling with porous flaky activated carbon(AC) from green tea, yielded asymmetric supercapacitor(ASC) with greatly enhanced performance parameters: specific capacitance(SC) of 557 F g−1, energy and power density(E and P) maxima of 173 Wh kg−1 and ∼3 kW kg−1, compared to reported ASCs of carbon/ZnCo2O4 composites and pure ZnCo2O4 or ZnO. Sub-stoichiometry in ZnO overlayer endows it with good electrical conductivity (14.6 mS cm−1), enhancing overall electron circulation in composite and due to direct contact between two oxides, with different morphologies and sufficient porosity, electrolyte penetration is deep, and ample ion-accommodation sites prevail in ZnO@ZnCo2O4 composite, which translate into increased SC, E, P, rate-response and cycle life. Usefulness of high-performance AC//ZnO@ZnCo2O4 ASC is ratified by connecting it in its fully charged state to electrochromic device (ECD) of polyaniline and tungsten oxide, and large integrated transmission modulation of 45.8% was rendered in ECD over bulk of visible region (480–800 nm). This demonstration of self-powering ECD proved efficacy of these devices for futuristic applications, where, dual functions of energy storage and saving can be tapped, by using such low cost, highly efficient devices, that can not only work independently, but can also work in tandem.
Binder free flexible symmetric supercapacitors are developed with nickel cobaltite micro-flower c... more Binder free flexible symmetric supercapacitors are developed with nickel cobaltite micro-flower coated poly(3,4-ethylenedioxypyrrole) (NiCo2O4@PEDOP) hybrid electrodes.
Photo-supercapacitors (PSCs) combine functions of energy harvesting and storage in a single devic... more Photo-supercapacitors (PSCs) combine functions of energy harvesting and storage in a single device, and in this study, a new architecture for a PSC is designed and implemented. Cadmium sulfide (CdS) quantum dots/hibiscus (hb) dye co-sensitized TiO is used as the solar cell. Poly(3,4-ethylenedioxypyrrole) (PEDOP)@manganese dioxide (MnO) is employed as the counter electrode (CE) for the solar cell and also as the electrodes for the symmetric supercapacitor. The two ends of a long flat current collector support two spatially separated PEDOP@MnO coatings, which serve as the CEs for the TiO/hb/CdS photoanode and yet another PEDOP@MnO electrode in sandwich configurations. In this cell, under 1 sun (100 mW cm) illumination, the TiO/hb/CdS photoanode undergoes charge separation and by channeling the photocurrent to the PEDOP@MnO electrodes, the symmetric cell part is charged to a voltage of 0.72 V. The PSC delivers a specific capacitance of 183 F g, an energy density of 13.2 Wh kg, and a po...
The hierarchical heterostructure of NiMoO4@NiMnCo2O4 (NMO@NMCO) with furry structures of NMCO jux... more The hierarchical heterostructure of NiMoO4@NiMnCo2O4 (NMO@NMCO) with furry structures of NMCO juxtaposed with NMO nanowires are endowed with multiple electrochemically active and accessible sites for ion storage, thus delivering an ultrahigh specific capacitance of 2706 F g-1, nearly two-fold times greater than that of sole NMCO. Electrodeposition of an overlayer of a highly robust and electrically conducting polymer, poly(3,4-propylenedioxythiophene) (PProDOT), not only improves the energy storage performance but also assists the binary oxide cathode in retaining its structural integrity during redox cycling. Coupling with an anode of porous flaky carbon (FC) derived from groundnut shells results in an asymmetric supercapacitor of FC//PProDOT@NiMoO4@NiMnCo2O4, which delivers an outstanding capacitance of 552 F g-1, energy and power density ranges of 172-40 Wh kg-1 and 0.75-10 kW kg-1, respectively, and a remarkable cycle life of 50 000 cycles, with ∼97.8% capacitance retention, over an operational voltage window of 1.5 V. From an application perspective, the charged supercapacitor was connected to a complementary coloring reversible electrochromic device (ECD) of Prussian blue//PProDOT, and the ECD state transformed from a pale-blue to a deep blue hue, thus signaling the efficient utilization of energy stored in the supercapacitor. The energy-saving attribute of the ECD was realized in terms of an integrated visible-light modulation of 39% that accompanied the optical transition. Deployment of low-cost devices at homes and commercial spaces, capable of storing and saving energy, is the way forward, and this is one significant step in this direction.
Abstract Zinc cobaltite(ZnCo2O4) micro-star shaped porous superstructure, on coating with zinc ox... more Abstract Zinc cobaltite(ZnCo2O4) micro-star shaped porous superstructure, on coating with zinc oxide(ZnO) nano-stubs, and coupling with porous flaky activated carbon(AC) from green tea, yielded asymmetric supercapacitor(ASC) with greatly enhanced performance parameters: specific capacitance(SC) of 557 F g−1, energy and power density(E and P) maxima of 173 Wh kg−1 and ∼3 kW kg−1, compared to reported ASCs of carbon/ZnCo2O4 composites and pure ZnCo2O4 or ZnO. Sub-stoichiometry in ZnO overlayer endows it with good electrical conductivity (14.6 mS cm−1), enhancing overall electron circulation in composite and due to direct contact between two oxides, with different morphologies and sufficient porosity, electrolyte penetration is deep, and ample ion-accommodation sites prevail in ZnO@ZnCo2O4 composite, which translate into increased SC, E, P, rate-response and cycle life. Usefulness of high-performance AC//ZnO@ZnCo2O4 ASC is ratified by connecting it in its fully charged state to electrochromic device (ECD) of polyaniline and tungsten oxide, and large integrated transmission modulation of 45.8% was rendered in ECD over bulk of visible region (480–800 nm). This demonstration of self-powering ECD proved efficacy of these devices for futuristic applications, where, dual functions of energy storage and saving can be tapped, by using such low cost, highly efficient devices, that can not only work independently, but can also work in tandem.
Binder free flexible symmetric supercapacitors are developed with nickel cobaltite micro-flower c... more Binder free flexible symmetric supercapacitors are developed with nickel cobaltite micro-flower coated poly(3,4-ethylenedioxypyrrole) (NiCo2O4@PEDOP) hybrid electrodes.
Photo-supercapacitors (PSCs) combine functions of energy harvesting and storage in a single devic... more Photo-supercapacitors (PSCs) combine functions of energy harvesting and storage in a single device, and in this study, a new architecture for a PSC is designed and implemented. Cadmium sulfide (CdS) quantum dots/hibiscus (hb) dye co-sensitized TiO is used as the solar cell. Poly(3,4-ethylenedioxypyrrole) (PEDOP)@manganese dioxide (MnO) is employed as the counter electrode (CE) for the solar cell and also as the electrodes for the symmetric supercapacitor. The two ends of a long flat current collector support two spatially separated PEDOP@MnO coatings, which serve as the CEs for the TiO/hb/CdS photoanode and yet another PEDOP@MnO electrode in sandwich configurations. In this cell, under 1 sun (100 mW cm) illumination, the TiO/hb/CdS photoanode undergoes charge separation and by channeling the photocurrent to the PEDOP@MnO electrodes, the symmetric cell part is charged to a voltage of 0.72 V. The PSC delivers a specific capacitance of 183 F g, an energy density of 13.2 Wh kg, and a po...
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Papers by sathish deshagani