scholarly journals Extraction of a quantitative reaction mechanism from linear sweep voltammograms obtained on a rotating disk electrode

2007 ◽  
Author(s):  
E. Tourwé ◽  
T. Breugelmans ◽  
R. Pintelon ◽  
A. Hubin
Keyword(s):  
Reaction Mechanism ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Disk Electrode ◽  
Linear Sweep

Dioxygen reduction catalyzed by substituted iron tetraphenylporphyrins in acidic media

2012 ◽  
Vol 16 (03) ◽  
pp. 310-315 ◽  
Author(s):  
Aixiang Lü ◽  
Yuanyuan Fang ◽  
Min Zhu ◽  
Shi Huang ◽  
Zhongping Ou ◽  
...  
Keyword(s):  
Linear Sweep Voltammetry ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Disk Electrode ◽  
Linear Sweep ◽  
Acidic Media ◽  
Dioxygen Reduction ◽  
Porphyrin Macrocycle ◽  
Phenyl Rings ◽  
Electron Donating Groups

Five iron tetraphenylporphyrins including the (TPP)FeCl and its derivatives which contain electron-withdrawing or electron-donating substituents on the meso-phenyl rings of the porphyrin macrocycle were examined as catalysts for the electoreduction of dioxygen in 1.0 M HClO4. The investigated compounds are represented as ( T p RPP ) FeCl , where T p RPP is the dianion of the para-substituted tetraphenylporphyrin and R = NEt2, OMe , H , Br or CF3. Cyclic voltammetry and linear sweep voltammetry at a rotating disk electrode (RDE) or a rotating ring disk electrode (RRDE) were utilized to examine the catalytic activity of the compounds. The number of electrons transferred and the percentage of H2O2produced as the product of O2electroreduction were calculated. The investigated iron porphyrins containing electron-withdrawing substituents ( R = Br and CF3) were shown to be more efficient catalysts for O2reduction than the compounds having electron-donating groups ( R = NEt2and OMe ) on the four phenyl rings of the porphyrin macrocycle.

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