NDLI: A Comparative Study of Cathodic Electrodeposited Nickel Hydroxide Films Electrocatalysts

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Electrocatalysis : Volume 4, Issue 3, September 2013

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Electrocatalysis : Volume 3

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Electrocatalysis : Volume 1

A Comparative Study of Cathodic Electrodeposited Nickel Hydroxide Films Electrocatalysts

Content Provider	Springer Nature Link
Author	Amadelli, R. Ferro, S. Barison, S. Kötz, R. Schnyder, B. Velichenko, A. B.
Copyright Year	2013
Abstract	This paper describes the cathodic electrodeposition of nickel hydroxides from NiCl$_{2}$ at constant potentials. In a single-compartment electrochemical cell, the procedure yields black films that have the appearance of glassy carbon. XPS analyses reveal that the films consist of a mixture of Ni(OH)$_{2}$ and NiOOH in a proportion that depends on the deposition potential; furthermore, SIMS analyses indicate that the coatings are richer in NiOOH in the inner regions towards the support. The electrochemical behavior has been compared with data obtained on electrodes based on pure Ni(OH)$_{2}$ prepared by cathodic electrodeposition from Ni(NO$_{3}$)$_{2}$, following literature procedures. This comparison confirms the composite nature of black nickel hydroxide (BN) coatings, adding that Ni(OH)$_{2}$ and NiOOH are present in nearly equal amounts. The electrocatalytic activity of BN electrodes was tested in the oxidation of methanol in alkaline solutions. Experimental results are consistent with a mechanism previously proposed in literature for the oxidation of organic compounds on nickel electrodes. Comparison with electrodes based on pure Ni(OH)$_{2}$ shows that, in the low potentials region, the presence of a high amount of NiOOH causes a decrease of activity, while an opposite effect is observed when the potential is increased. The black nickel electrodes show a remarkable stability in repeated cycles of oxidation of methanol and O$_{2}$ evolution; under similar conditions, conventional Ni(OH)$_{2}$ films show an appreciable decrease in thickness, as evidenced by the decrease of peak charge in cyclic voltammetry experiments.
Starting Page	329
Ending Page	337
Page Count	9
File Format	PDF
ISSN	18682529
Journal	Electrocatalysis
Volume Number	4
Issue Number	4
e-ISSN	18685994
Language	English
Publisher	Springer US
Publisher Date	2013-08-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nickel hydroxides Electrodeposition Methanol Oxidation Oxygen evolution Electrochemistry Physical Chemistry Catalysis Energy Technology
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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