Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 504, Issue 1, Pages 59-63Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0022-0728(01)00427-2
Keywords
modified electrode; catalytic electro-oxidation; reaction kinetics; ascorbic acid; Meso-tetrakis(o-nitrophenyl)tetrabenzoporphyrin; complex catalysis
Categories
Ask authors/readers for more resources
The catalytic properties of the macrocyclic compounds of meso-tetrakis(o-nitrophenyl)tetrabenzoporphyrin (TBP) with Fe(III), Mn(III), Ni(II), and Co(II) were examined for the electrochemical oxidation of ascorbic acid (H,A), when the coordination compounds were deposited on glassy carbon electrodes. The catalytic activity increased in the order of galssy carbon electrode < Co(II)TBP < Ni(II)TBP < Mn(III)TBP < Fe(III)TBP. Kinetic measurements of the processes were carried out. The Tafel slopes determined are 59.5 mV for Fe(III)TBP, 72.86 mV for Mn(III)TBP, 66.80 mV for NI(II)TBP, and 68.52 mV for Co(II)TBP. For all catalysts the reaction orders with respect to H(2)A and H+ are 1 and - 2, respectively. The mechanism of the electro-oxidation of H,A is proposed as a CE reaction. (C) 2001 Elsevier Science B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available