CHRONOPOTENTIOMETRIC DEPOSITION / DISSOLUTION KINETICS AND TEXTURAL ANALYSIS OF Ni-Fe OXY HYDROXIDE NANO FILMS

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Published: 2017-02-27

Page: 193-201


M. KANAGASABAPATHY *

Department of Chemistry, Rajapalayam Rajus’ College, Madurai Kamaraj University, Rajapalayam 626117 (TN), India

K. SIVARAMAMOORTHY

Department of Physics, Rajapalayam Rajus’ College, Madurai Kamaraj University, Rajapalayam 626117 (TN), India

S. ASATH BAHADUR

Department of Physics, Kalasalingam University, Krishnankoil 626126 (TN), India

G. SRINIVASAGAN

Department of Chemistry, Rajapalayam Rajus’ College, Madurai Kamaraj University, Rajapalayam 626117 (TN), India

*Author to whom correspondence should be addressed.


Abstract

Nano oxy hydroxides of Ni and Fe are electrochemically deposited from sulfate-based bath via, hydrogen evolution and peroxide formation reactions. From chronopotentiometric and chronoamperometric transients, it can be noted that, non-faradaic, anomalous co-deposition occurs due to charge-transfer limitations, which in turn enhances the formation of β-Ni(OH)2. Unlike cathodic cycle, during anodic dissolution, iron rich films preferentially oxidized by two-electron-transfer with lower coulombic charge. Using self-designed computer simulation program, coded in MS-Visual Studio ‘Crystalsim’, {kkl} family planes are indexed along with d-spacing data. From FTIR, O-H stretching signal for both Ni and Fe hydroxides was observed. Transformation of acicular to nano-sphered morphology was noted in presence of NO3- rather than H+ with an average grain size is about 25 nm. With the increase in cathodic current density, grain growth rate is enhanced by diffusion limitations of Ni2+ and e- transfer rate of Fe2+ is enhanced. Deposition kinetics is under charge-transfer control at lower cathodic current density and becomes diffusion limited towards cathodic interface due to the change in concentration overpotential, at higher current density.

Keywords: Nickel, iron, oxy hydroxides, oxides, chronopotentiometry, electrochemical kinetics


How to Cite

KANAGASABAPATHY, M., SIVARAMAMOORTHY, K., BAHADUR, S. A., & SRINIVASAGAN, G. (2017). CHRONOPOTENTIOMETRIC DEPOSITION / DISSOLUTION KINETICS AND TEXTURAL ANALYSIS OF Ni-Fe OXY HYDROXIDE NANO FILMS. Journal of Applied Chemical Science International, 7(3), 193–201. Retrieved from https://ikprress.org/index.php/JACSI/article/view/3853

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