Narendrakumar, A.V. and Harish, S. and James, J.
(2014)
New route for synthesis of electrocatalytic Ni(OH)2 modified electrodes⎯
electrooxidation of borohydride as probe reaction.
Bulletin of Materials Science, 37 (3).
pp. 635-641.
ISSN 0250-4707
Abstract
Immobilization of redox species like Ni(OH)2 onto the electrode surface is important in the application
areas such as super capacitor, electrochromic displays and electrocatalysis. Nickel hexacyanoferrate
(NiHCF) modified glassy carbon could be further derivatized with Ni(OH)2 by electrochemical cycling in
alkali. The electrodeposition of Ni(OH)2 was usually carried out onto the electrode surface from nickel salt at
high interfacial pH. This paper reports the preparation of Ni(OH)2 from insoluble nickel tetracyanonickelate
supported on carbon (NTN/C). This insoluble precursor complex was decomposed by two methods. (1) By
potential cycling of modified electrode with the above complex in alkali. (2) By thermal decomposition of the
precursor complex (NTN/C) to form metallic nickel followed by cycling in alkali. Ni(OH)2 modified electrodes
formed using both methods were characterized by cyclic voltammetry and also by Fourier transform infrared
spectroscopy, X-ray diffraction and scanning electron microscopy. Further, electrocatalytic properties of
Ni(OH)2/C modified electrodes formed by the above two methods were studied and compared using borohydride
oxidation as probe reaction
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