Shruthi B, Bheema Raju V, Madhu B J
Department of Chemistry, Dr. Ambedkar Institute of Technology, Bangalore 560 056, India.
Post Graduate Department of Physics, Government Science College, Chitradurga 577 501, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Jan 25;135:683-9. doi: 10.1016/j.saa.2014.07.009. Epub 2014 Jul 27.
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.
采用沉淀法成功合成了β-氢氧化镍（β-Ni(OH)₂）。通过X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、拉曼光谱和热重-差热分析（TG-DTA）对β-Ni(OH)₂的结构和性能进行了表征。FTIR光谱和TG-DTA研究结果表明，β-Ni(OH)₂含有水分子和阴离子。使用扫描电子显微镜（SEM）和能量色散X射线（EDX）分析进行了微观结构和成分研究。以β-Ni(OH)₂粉末为活性材料，在镍片集流体上制备了粘贴式电极。进行循环伏安法（CV）和电化学阻抗谱（EIS）研究以评估β-Ni(OH)₂电极在6M KOH电解液中的电化学性能。由于β-Ni(OH)₂的法拉第氧化还原反应，CV曲线显示出一对强氧化还原峰。发现当前β-Ni(OH)₂电极材料的质子扩散系数（D）为1.44×10⁻¹² cm² s⁻¹。此外，电化学阻抗研究证实β-Ni(OH)₂电极反应过程受扩散控制。
