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Electrocatalytic Effect of Dioxygen Reduction at Glassy Carbon Electrode Modified with Schiff Base Co(II) Complexes
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1998, v.11 no.6, pp.460-468
Seong,
J., Chae,
H., &
Choi,
Y.
(1998). Electrocatalytic Effect of Dioxygen Reduction at Glassy Carbon Electrode Modified with Schiff Base Co(II) Complexes. Analytical Science and Technology, 11(6), 460-468.
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Abstract
Schiff base ligands such as <TEX>$SOPDH_2$</TEX>, <TEX>$SNDH_2$</TEX>, <TEX>$EBNH_2$</TEX>, and <TEX>$PBNH_2$</TEX> and their Co(II) complexes such as [<TEX>$Co(II)(SND)(H_2O)_2$</TEX>], [<TEX>$Co(II)(SOPD)(H_2O)_2$</TEX>], [<TEX>$Co(II)(EBN)(H_2O)$</TEX>], and [<TEX>$Co(II)(PBN)(H_2O)$</TEX>] have been synthesized. The mole ratio of Shiff base ligand to cobalt(II) for the Co(II) complexes was found to be 1:1. Also these complexes have been configurated with hexa-coordination. Reduction of dioxygen was investigated by cyclic voltammetry at glassy carbon electrodes modified with Schiff base Co(II) complexes in 1 M KOH aqueous solution. At modified glassy carbon electrode with Schiff base Co(II) complexes, reduction peak current of oxygen was increased and peak potential was shifted to more positive direction compared to bare glassy carbon electrode. The electrokinetic parameters such as number of electron and exchange rate constant were calculated from the results of cyclic voltammogrms. The reduction of dioxygen at glassy carbon electrode has been <TEX>$2e^-$</TEX> reaction pathway. Exchange rate constant at glassy carbon electrode modified with Co(II) complexes was increased 2~10 times compared to bare electrode.
- keywords
- schiff base Co(II) complexes, cyclic voltammetry, exchange rate constant
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