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Electroless Preparation and Electrochemistry of Nickel‐Pentacyanonitrosylferrate Film Modified Aluminum Electrode
Author(s) -
PournaghiAzar M. H.,
RazmiNerbin H.
Publication year - 2000
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(200002)12:3<209::aid-elan209>3.0.co;2-i
Subject(s) - nickel , ascorbic acid , electrode , inorganic chemistry , electrochemistry , electrolyte , alkali metal , palladium hydrogen electrode , materials science , metal , working electrode , chemistry , metallurgy , organic chemistry , food science
The use of aluminum substrate as an electrode and the modification of its surface by means of the thin film of nickel pentacyanonitrosylferrate (NiPCNF) was developed. The modification conditions of aluminum surface including the electroless deposition of metallic nickel on the electrode surface from NiCl 2 +NH 4 Cl solution and chemical derivatization of deposited nickel to NiPCNF film in solution of 10 mM sodium pentacyanonitrosylferrate (PCNF)+0.5 M NaNO 3 +0.03 M HNO 3 are described. The modified Al electrode prepared under optimum conditions, shows a well‐defined redox couple due to [Ni II Fe III/II (CN) 5 NO] 0/–1 system. The effect of pH and radius of the hydrated alkali‐metal cation of supporting electrolyte on the electrochemical characteristics of the modified electrode were studied in detail. Diffusion coefficients of alkali‐metal cations in the film ( D ),transfer rate constant for electron ( k s ) and transfer coefficient (α) were calculated. The electrocatalytic activity of the modified electrode on the oxidation of hydrogen peroxide and ascorbic acid was demonstrated as a typical example of applications.