Electroless Preparation and Electrochemistry of Nickel-Pentacyanonitrosylferrate Film Modified Aluminum Electrode

✍ Scribed by M. H. Pournaghi-Azar; H. Razmi-Nerbin

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 171 KB
• Volume: 12
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/(sici)1521-4109(200002)12:3<209::aid-elan209>3.0.co;2-i

✦ Synopsis

The use of aluminum substrate as an electrode and the modi®cation of its surface by means of the thin ®lm of nickel pentacyanonitrosylferrate (NiPCNF) was developed. The modi®cation 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 ®lm in solution of 10 mM sodium pentacyanonitrosylferrate (PCNF) 0.5 M NaNO 3 0.03 M HNO 3 are described. The modi®ed Al electrode prepared under optimum conditions, shows a well-de®ned redox couple due to [Ni II Fe III/II (CN) 5 NO] 0/71 system. The effect of pH and radius of the hydrated alkali-metal cation of supporting electrolyte on the electrochemical characteristics of the modi®ed electrode were studied in detail. Diffusion coef®cients of alkali-metal cations in the ®lm (D),transfer rate constant for electron (k s ) and transfer coef®cient (a) were calculated. The electrocatalytic activity of the modi®ed electrode on the oxidation of hydrogen peroxide and ascorbic acid was demonstrated as a typical example of applications.