Electrochemical and magneto-optical properties of cobalt molybdate nano-catalyst as high-performance supercapacitor. Issue 15 (15th October 2018)

• Record Type: Journal Article
• Authors: Seevakan, K.; Manikandan, A.; Devendran, P.; Baykal, A.; Alagesan, T.
• Is Part Of: Ceramics international. Volume 44:Issue 15(2018)
• Page Start: 17735
• Page End: 17742
• Publication Date: 2018-10-15
• Subjects: CoMoO4 nanocatalyst -- Microwave combustion -- Magneto-optical properties -- Electrochemical studies -- Specific capacitance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.06.240
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Nanorod shaped cobalt molybdate (CoMoO4 ) electro-catalysts synthesized by microwave combustion route using urea as the fuel. The formation of monoclinic nanocrystalline structure, metal-oxygen (M–O) and chemical bonding was confirmed by X-ray powder diffractometry (XRD), Fourier transform infrared (FT-IR) and Raman spectroscopy, respectively. Scanning electron microscope (SEM) associated with energy dispersive X-ray (EDX) and high-resolution transmission electron microscope (HR-TEM) were used to confirm the morphology, elemental composition and particle size of the samples, respectively. The optical and defects were confirmed by the UV–vis. absorption and photoluminescence (PL) spectroscopy at room temperature (RT). The room temperature magnetic behaviors of product were investigated by vibrating sample magnetometer (VSM). Surface binding energy and element confirmation were examined by X-ray Photoelectron spectroscopy (XPS). The electrochemical (EC) performance was studied by cyclic voltammetry (CV), galvanostatic charge-discharge analysis (GCD) and electrochemical impedance spectroscopy (EIS) analysis. The CV curve proved the existence of redox pairs and the supercapacitor nature exhibited by the EIS (Nyquist plots). The GCD studies provided the non-symmetrical discharge curves and the highest specific capacitance (Csp) of ~ 133 F/g were acquired at a constant discharge current density (1 mA/cm −2 ). The cyclic stability investigations revealed capacitance retention of about 100% after 1000 cycles, proposing the prospective usage of CoMoO4 in energy-storage devices.