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A Comparative Study of the Electrocatalytic Activities of Some Metal Hexacyanoferrates for the Oxidation of Hydrazine
Author(s) -
Narayanan S. Sriman,
Scholz Fritz
Publication year - 1999
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(199906)11:7<465::aid-elan465>3.0.co;2-#
Subject(s) - hydrazine (antidepressant) , chemistry , metal , combinatorial chemistry , inorganic chemistry , organic chemistry , biochemistry
The electrocatalytic properties of electrodes modified with metal [Cr(III), Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Ag(I), Cd(II) and In(III)] hexacyanoferrates(II) were studied by cyclic voltammetry using hydrazine as substrate. The electrodes were prepared by mechanically transferring microparticles of the hexacyanoferrates onto the surface of a paraffin impregnated graphite electrode. The catalytic activities of these compounds were compared based on the ratio of the total current for the catalytic oxidation to the current for the modified electrode. This ratio has been calculated at the peak potentials of the cyclic voltammograms and also at some fixed anodic potentials. As expected for an electrocatalytic reaction, it was observed that the current ratio is higher at slow scan rates and lower at high scan rates. The catalytic activities of hexacyanoferrates are rather complex and they do not follow any uniform pattern. The hexacyanoferrates of manganese, zinc and indium turned out to possess the highest catalytic activity.