Effects of ring substituents on electrocatalytic activity of manganese phthalocyanines towards the reduction of molecular oxygen

Sehlotho, N. and Nyokong, T. (2006) Effects of ring substituents on electrocatalytic activity of manganese phthalocyanines towards the reduction of molecular oxygen. Journal of Electroanalytical Chemistry, 595 (2). pp. 161-167. ISSN 0022-0728

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Official URL: http://dx.doi.org/10.1016/j.jelechem.2006.07.011

Abstract

Reduction of oxygen electrocatalyzed by adsorbed films of manganese phthalocyanine complexes is reported. The complexes studied were: manganese phthalocyanine (MnPc, 1); manganese tetraamino phthalocyanine (MnTAPc, 2); manganese tetrapentoxy pyrrole phthalocyanine (MnTPePyrPc, 3); manganese tetra phenoxy pyrrole phthalocyanine (MnTPPyrPc, 4); manganese tetra mercaptopyrimidine phthalocyanine (MnTMPyPc, 5) and manganese tetra ethoxy thiophene phthalocyanine (MnTETPc, 6). The reaction was conducted in buffer solutions of pH range 1–12. Rotating disk electrode voltammetry revealed two electron reduction in acidic and slightly alkaline media due to the formation of hydrogen peroxide. In highly basic media, water is the major product formed via four electron transfer. The reaction was found to be first order in the diffusing analyte oxygen.

Item Type:Article
Uncontrolled Keywords:Manganese phthalocyanine; oxygen reduction; Hydrogen peroxide; Rotating disk; Cyclic voltammetry
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Chemistry
ID Code:643
Deposited By: Mrs Eileen Shepherd
Deposited On:05 Jun 2007
Last Modified:06 Jan 2012 16:18
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