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Green synthesis of NiO nanostructured materials using Hydrangea paniculata flower extracts and their efficient application as supercapacitor electrodes
- Kundu, Manab, Karunakaran, Gopalu, Kuznetsov, Denis
- Powder technology 2017 v.311 pp. 132-136
- Hydrangea paniculata, capacitance, electrochemistry, electrodes, electrons, flowers, ions, nanoparticles, nickel oxide, plant extracts, porosity, powders, surface area
- In this report, for the first time, we have applied green synthesis NiO nanoparticles (NiO-NPs) as an electrode material for supercapacitor (SC). Hydrangea paniculata flower extracts were used for the green synthesis of NiO-NPs. The green synthesized NiO-NPs is found to be 33nm with surface area of 78.472m²g⁻¹ along with pore volume and pore size of 0.149cm³g⁻¹ and 4.061nm. The green synthesized NiO-NPs based electrode exhibit high specific capacitance of 752, 709, 644, 603 and 581Fg⁻¹ at current densities of 2.5, 5, 10, 20, and 40Ag⁻¹, respectively, are revealing excellent capacitance retention even at a high current density. More notably, the NiO-NPs electrodes also show outstanding cycling stability up to 5000cycles at 10Ag⁻¹ without discernable capacitance fading. This superior electrochemical performance of NiO-NPs is mainly attributed to the nano-dimention of the particles, which shorten the diffusion path lengths for both ions and electrons, ease migration during the rapid charge-discharge process and consequently improve the effective electrochemical utilization of electroactive material.