title: Synthesis, spectroscopic and electrochemical performance of pasted β-nickel hydroxide electrode in alkaline electrolyte.
abstract: β-Nickel hydroxide (β-Ni(OH)2) was successfully synthesized using precipitation method. The structure and property of the β-Ni(OH)2 were characterized by X-ray diffraction (XRD), Fourier Transform infra-red (FT-IR), Raman spectra and thermal gravimetric-differential thermal analysis (TG-DTA). The results of the FTIR spectroscopy and TG-DTA studies indicate that the β-Ni(OH)2 contains water molecules and anions. The microstructural and composition studies have been performed using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) analysis. A pasted-type electrode is prepared using β-Ni(OH)2 powder as the active material on a nickel sheet as a current collector. Cyclic voltammetry (CV) and Electrochemical impedance spectroscopy (EIS) studies were performed to evaluate the electrochemical performance of the β-Ni(OH)2 electrode in 6M KOH electrolyte. CV curves showed a pair of strong redox peaks as a result of the Faradaic redox reactions of β-Ni(OH)2. The proton diffusion coefficient (D) for the present β-Ni(OH)2 electrode material is found to be 1.44×10(-12) cm(2) s(-1). Further, electrochemical impedance studies confirmed that the β-Ni(OH)2 electrode reaction processes are diffusion controlled.
authors.affiliation: Department of Chemistry, Dr. Ambedkar Institute of Technology, Bangalore 560 056, India.
authors.forename: B
authors.initials: B
authors.lastname: Shruthi
authors.affiliation: Department of Chemistry, Dr. Ambedkar Institute of Technology, Bangalore 560 056, India.
authors.forename: V
authors.initials: V
authors.lastname: Bheema Raju
authors.affiliation: Post Graduate Department of Physics, Government Science College, Chitradurga 577 501, India. Electronic address: bjmadhu@gmail.com.
authors.forename: B J
authors.initials: BJ
authors.lastname: Madhu
mesh_terms: D000468:Alkalies / Q000737:chemistry*; D058266:Dielectric Spectroscopy; D004055:Differential Thermal Analysis; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry*; D006878:Hydroxides / Q000138:chemical synthesis* / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D000468:Alkalies; D004573:Electrolytes; D006878:Hydroxides; C037473:nickel hydroxide; D009532:Nickel
keywords: Alkaline electrolyte; Electrochemical properties; Electrode material; Nickel hydroxide; Proton diffusion coefficient