Preparation and characterization of nanostructured NiO/MnO2 composite electrode for electrochemical supercapacitors

Microwave-assisted non-aqueous homogenous precipitation of nanoball-like mesoporous α-Ni(OH)2 as a precursor for NiOx and its application as a pseudocapacitor

“…Unfortunately, the expensive and toxic nature of ruthenium oxides limits their widespread use and commercialization. Hence, much effort has been exerted to replace ruthenium oxides by transient metal oxides/hydroxides such as NiO, [11][12][13][14] Ni(OH) 2 , 7,15-18 Co 3 O 4 , 19,20 MnO 2 , 21 and Co(OH) 2 . 22,23 NiO is considered as a promising active electrode material for pseudocapacitors in alkaline electrolytes because of its high specific capacitance (SC), lower cost, ease of preparation and improved environmental compatibility.…”

Synthesis and Characterization of Phase Pure NiO Nanoparticles via the Combustion Route using Different Organic Fuels for Electrochemical Capacitor Applications

“…The crystallite sizes have been calculated by Scherrer's equation [40]. The equation is mentioned below (1). (1) where 'D' is the crystalllite size, 'C' is the numerical constant (~0.9), 'λ' is the wavelength of x-rays (for CuKα radiation, λ = 1.5418 Å), 'β ' is the effective broadening taken as a full width at half maximum (FWHM) (in radians), 'θ ' is the diffraction angle for the peak.…”

“…Depending on the charge storage mechanisms, the electrochemical capacitors can be categorized into two types, (i) electrochemical double-layer capacitors, mainly focusing on carbon materials in which the capacitance evolves from the charge separation at the electrode and electrolyte interface; and (ii) pseudocapacitors, mainly concentrating upon conducting metal oxides and polymers which utilize the charge transfer pseudo-capacitance arising from reversible Faradaic reaction occurring at the electrode surface within the active electrode materials [1]. The electrode material is a main component in electrochemical capacitors because it determines the electrochemical performance of any full scale commercial ultra capacitors [2].…”

Enhancement in electrochemical behavior of copper doped MnO2 electrode

“…Among the available transition metal oxides, MnO 2 has attracted a great deal of attention for its role as an electrode material for supercapacitors [2]. An efficient approach to enhance the specific capacity of metal oxide is incorporating one or two metal ions into them to form multimetal compounds, such as Mn-Ni [3] oxide, Mn-Co [4] Mn-Fe [5], and Ni-Zn-Co oxides [6]. Several techniques have been employed so far to prepare MnO 2 with controlled morphologies and structures, including, thermal decomposition method, sol-gel route, co precipitation method, and electrochemical deposition method [7].…”