بيانات النشر: Luleå tekniska universitet, Materialvetenskap
Institute of Physics, University of Sindh Jamshoro, Sindh, Pakistan
Institute of Chemistry, Shah Abdul Latif University Khairpur Mirs, Sindh, Pakistan
Institute of Environmental Sciences, University of Sindh Jamshoro, Sindh, Pakistan
Mehran University of Engineering and Technology, 7680 Jamshoro, Sindh, Pakistan
Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia
Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
Department of Inorganic Chemistry, Crystallography and Mineralogy, Unidad Asociada al ICP-CSIC, Faculty of Sciences, University of Malaga, Campus de Teatinos, Malaga, Spain
Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Venezia Mestre, Italy
Institute of Chemistry, University of Sindh Jamshoro, Sindh, Pakistan
نبذة مختصرة : Recently, the nanostructured nickel–cobalt bimetallic oxide (NiCo2O4) material with high electrochemical activity has received intensive attention. Beside this, the biomass assisted synthesis of NiCo2O4 is gaining popularity due to its advantageous features such as being low cost, simplicity, minimal use of toxic chemicals, and environment-friendly and ecofriendly nature. The electrochemical activity of spinel NiCo2O4 is associated with its mixed metal oxidation states. Therefore, much attention has been paid to the crystal quality, morphology and tunable surface chemistry of NiCo2O4 nanostructures. In this study, we have used citrus lemon juice consisting of a variety of chemical compounds having the properties of a stabilizing agent, capping agent and chelating agent. Moreover, the presence of several acidic chemical compounds in citrus lemon juice changed the pH of the growth solution and consequently we observed surface modified and structural changes that were found to be very effective for the development of energy conversion and energy storage systems. These naturally occurring compounds in citrus lemon juice played a dynamic role in transforming the nanorod morphology of NiCo2O4 into small and well-packed nanoparticles. Hence, the prepared NiCo2O4 nanostructures exhibited a new surface-oriented nanoparticle morphology, high concentration of defects on the surface (especially oxygen vacancies), sufficient ionic diffusion and reaction of electrolytic ions, enhanced electrical conductivity, and favorable reaction kinetics at the interface. The electrocatalytic properties of the NiCo2O4 nanostructures were studied in oxygen evolution reaction (OER) at a low overpotential of 250 mV for 10 mA cm−2, Tafel slope of 98 mV dec−1, and durability of 40 h. Moreover, an asymmetric supercapacitor was produced and the obtained results indicated a high specific capacitance of (Cs) of 1519.19 F g−1, and energy density of 33.08 W h kg−1 at 0.8 A g−1. The enhanced electrochemical performance could be attributed to the ...
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