Researchers from School of Electrical Engineering, Pusan National University developed hierarchical nanoflowers on highly conductive flexible nickel foam substrates
Novel energy sources are a potential alternative for carbon fuels that lead to environmental pollution. Moreover, rapid depletion in sources of fossil fuels and increasing concerns on global warming have also led to adoption of significant efforts to exploit renewable energy resources. Supercapacitor (SC) is an efficient and rapidly emerging energy storage device that has rapid charge-discharge capability, high energy and power density, sustained cycle life, and high flexibility.
SCs employ two ways of energy storage: electrochemical double layer capacitors (EDLCs) and pseudocapacitors (PCs or redox capacitors). Ion adsorption and desorption at the surface of the carbon electrode and redox electrolyte offer capacitance in EDLCs. Reversible faradaic redox reactions that commences at the electrolyte-electrode interface offers capacitance in PCs. The energy density in PCs is higher and can be attributed to their excellent conductivity and electrochemical properties, as compared to EDLCs. Now, a team of researchers from School of Electrical Engineering, Pusan National University fabricated NF/NiMoO4 and NF/NiMoO4/NiMoO4 nanostructures on a nickel foam substrate. In the process, the team used a simplistic hydrothermal approach and the nanostructures were assessed as electrode materials for supercapacitor applications.
The team used sodium molybdate dihydrate, nickel nitrate hexahydrate, thiourea, ammonium fluoride, potassium hydroxide, deionized water, and Ni foam in the process. Hierarchical NF/NiMoO4/NiMoO4 electrode material has morphological and structural properties that offer more active sites and large electrochemical surface area that is required to increase accessibility to the electroactive sites. These sites help to enhance the efficiency of ions and electrons for energy storing and transportation compared to the NF/NiMoO4 electrode. The team conducted electrochemical studies in potassium hydroxide electrolyte and found that the hierarchical NF/NiMoO4/NiMoO4 nanocomposite has a higher electrochemical behavior and a maximum specific capacitance that is greater than that of the NF/NiMoO4 electrode. The NF/NiMoO4/NiMoO4 nanocomposite also demonstrated excellent cycling stability and higher energy density that altogether promote it as a likely candidate for next generation flexible energy storage systems. The research was published in the journal MDPI Energies on March 24, 2019.
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