Transforming NiCo<sub>2</sub>O<sub>4</sub> nanorods into nanoparticles using citrus lemon juice enhancing electrochemical properties for asymmetric supercapacitor and water oxidation - Université de Lorraine Access content directly
Journal Articles RSC Advances Year : 2023

Transforming NiCo2O4 nanorods into nanoparticles using citrus lemon juice enhancing electrochemical properties for asymmetric supercapacitor and water oxidation

Abstract

Recently, the nanostructured nickel-cobalt bimetallic oxide (NiCo2O4) material with high electrochemical activity has received an intensive attention. Beside this, biomass assisted synthesis of NiCo2O4 is getting popularity due to advantageous features such as low cost, simple, minimum use of toxic chemicals, environment and ecofriendly The electrochemical activity of spinel NiCo2O4 is associated to mixed metal oxidation states. Therefore, large attention is paid on the crystal quality, morphology and tunable surface chemistry of NiCo2O4 nanostructures. In this study, we have used citrus lemon juice consisting variety of chemical compounds having properties of stabilizing agent, capping agent and chelating agent. Moreover, the presence of several acidic nature chemical compounds in citrus lemon juice have changed the pH of growth solution and consequently we observed the surface modified and structural changes which were found to be very effective for the development of energy conversion an energy storage systems. These naturally occurring compounds in citrus lemon juice have played a dynamic role in transforming the one dimensional (1D) nanorod morphology of NiCo2O4 to small and well packed zero dimensional (0D) nanoparticles. Hence, the prepared of NiCo2O4 nanostructures are exhibiting new surface-oriented nanoparticles, high defects on the surface (especially oxygen vacancies), sufficient ionic diffusion and reaction of electrolytic ions, enhanced electrical conductivity, and favorable reaction kinetics rate at the interface. The electrocatalytic properties of NiCo2O4 nanostructures were studied for the evaluation of oxygen evolution reaction (OER) at low overpotential of 250 mV for10 mAcm-2, Tafel slope of 98 mVdec-1, and durability of 40 h. Moreover, the asymmetric supercapacitor was investigated and obtained results indicated a high specific capacitance of (Cs) of 1519.19 Fg-1, and energy density of 33.08 Wh kg-1 at 0.8 Ag-1. The enhanced electrochemical performance could be attributed to the favorable structural changes, surface modification, and surface crystal facets exposure due to the use of citrus lemon juice. The proposed method of transformation of 1D nanorod to 0D nanoparticles could be used for the design of new generation of efficient electrocatalyst materials for energy storage and conversion uses.
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Dates and versions

hal-04250982 , version 1 (20-10-2023)

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Shusheel Kumar, Aneela Tahira, Adeel Liaquat Bhatti, Muhammad Ali Bhatti, Riaz Hussain Mari, et al.. Transforming NiCo2O4 nanorods into nanoparticles using citrus lemon juice enhancing electrochemical properties for asymmetric supercapacitor and water oxidation. RSC Advances, 2023, 13 (27), pp.18614-18626. ⟨10.1039/D3RA02438E⟩. ⟨hal-04250982⟩
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