Design of α-CoMoO4 Nanoflakes on Carbon Cloth and Investigation of Their Pseudocapacitance in Non-Aqueous Electrolyte and Electro-Oxidation of Methanol

Wednesday, 27 May 2015
Salon C (Hilton Chicago)
P. Narayanasamy, H. Shao (Tyndall National Institute, University College Cork), S. Selladurai (Anna University), C. O'Dwyer (Tyndall National Institute), and K. M. Razeeb (Tyndall National Institute, University College Cork)
Nanocrystalline cobalt molybdate (CoMoO4) nanoflakes were grown directly on carbon fiber cloth (CFC) via a simple hydrothermal method without any template or surfactant. Structure and morphology of the sample was characterized by x-ray diffraction (XRD), Raman spectra, scanning electron microscope (SEM), and transmission electron microscope (TEM). A symmetric supercapacitor was fabricated using nanocrystalline CoMoO4 nanoflakes as both negative and positive electrodes. The device has delivered a maximum specific capacitance of 8.3 F/g at a constant current density of 1 A/g in organic electrolyte. It offers a reasonable energy (2.6 Wh/kg) and power (748.8 W/kg) density as comparable to the carbon based symmetric supercapacitors. As a catalyst for methanol oxidation, the CoMoO4 nanoflakes showed high current density (25 mA/cm2) and low onset potential (0.38 V). The impressive bi-functional electrochemical activity of CoMoO4 on CFC mainly attributed to their porous microstructure, reasonable electrical conductivity resulted from binder-free and intimate metal oxide/substrate integration.