Premium
Electrocatalytic Characteristics of Thiosulfate Oxidationat Nickel Plated Aluminum Electrode Modified with Nickel Pentacyanonitrosylferrate Films
Author(s) -
PournaghiAzar M. H.,
RazmiNerbin H.
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200104)13:6<465::aid-elan465>3.0.co;2-q
Subject(s) - chronoamperometry , cyclic voltammetry , nickel , inorganic chemistry , electrode , linear sweep voltammetry , thiosulfate , redox , electrochemistry , voltammetry , materials science , electrocatalyst , chemistry , substrate (aquarium) , rotating disk electrode , analytical chemistry (journal) , metallurgy , organic chemistry , sulfur , oceanography , geology
Nickel pentacyanonitrosylferrate (NiPCNF) films have been deposited on the surface of aluminum substrate by a simple electroless dipping method. The cyclic voltammogram of the resulting surface modified Al electrode prepared under optimum conditions, shows a well‐behaved redox couple due to the [Ni II Fe III/II (CN) 5 NO] 0/–1 system. The NiPCNF films formed on the Al electrode show electrocatalytic activity towards the oxidation of thiosulfate in sodium nitrate solution. A linear calibration plot is obtained over the thiosulfate concentration range 5–110 mM and 0.001–100 mM, using linear sweep voltammetry and hydrodynamic voltammetry (at a fixed potential and stirred solutions), respectively. The kinetics of the catalytic reaction were investigated using cyclic voltammetry, rotating disk electrode (RDE) voltammetry and chronoamperometry. The results were explained using the theory of electrocatalytic reactions at chemically modified electrodes. The average value of the rate constant for the catalytic reaction evaluated by the three different approaches, is 9×10 −3 cm s −1 . Further examinations of the modified electrodes show that the modifying layers (NiPCNF) on the aluminum substrate show reproducible behavior and a high level of stability.