Linear sweep voltammetry at a rotating disk electrode for first-order quasi-reversible reactions

1983 ◽  
Vol 144 (1-2) ◽  
pp. 77-85 ◽  
Author(s):  
G.C. Quintana ◽  
P.C. Andricacos ◽  
H.Y. Cheh
Keyword(s):  
Linear Sweep Voltammetry ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Disk Electrode ◽  
Linear Sweep ◽  
First Order ◽  
Reversible Reactions

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.

Meso-dichlorophenyl substituted Co(III) corrole: A selective electrocatalyst for the two-electron reduction of dioxygen in acid media, X-ray crystal structure analysis and electrochemistry

2014 ◽  
Vol 18 (10n11) ◽  
pp. 891-898 ◽  
Author(s):  
Jijun Tang ◽  
Zhongping Ou ◽  
Lina Ye ◽  
Minzhu Yuan ◽  
Yuanyuan Fang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Pyrolytic Graphite ◽  
Linear Sweep Voltammetry ◽  
Rotating Disk ◽  
Crystal Structure Analysis ◽  
Rotating Disk Electrode ◽  
Disk Electrode ◽  
Acid Media ◽  
Pyrolytic Graphite Electrode

A cobalt(III) corrole, represented as ( Cl 2 Ph )3 CorCo ( PPh 3), where ( Cl 2 Ph )3 Cor is the trianion of 5,10,15-tri(2,4-dichlorophenyl)corrole, was synthesized and characterized as to its electrochemical and spectroelectrochemical properties. Single-crystal structure analysis showed the corrole to be monoclinic and have a space group P21/c with α = 13.441(3), b = 28.058(6), c = 27.584(6) Å, α = 90, β = 92.75(3), γ = 90°, Mr = 1144.38, V = 1039.1(4) Å3, Z = 8, Dc = 1.463 mg/cm3, μ = 0.816, F(000) = 4644, R int = 0.0447, R(I > 4σ(I)) = 0.0769, wR(I > 4σ(I)) = 0.2104, R( all data ) = 0.1214 and wR( all data ) = 0.2705. The compound was also examined as a catalyst for the electroreduction of dioxygen when coated on an edge-plane pyrolytic graphite electrode in 1.0 M HClO 4. Cyclic voltammetry and linear sweep voltammetry with a rotating disk electrode (RDE) or a rotating ring disk electrode (RRDE) were utilized to evaluate the catalytic activity of the corrole and elucidate the products of reduction, H 2 O or H 2 O 2. Analysis of the data shows exclusively a two-electron transfer process to give 100% H 2 O 2 as the product and no H 2 O was detectable.

Sign in / Sign up

Export Citation Format

Share Document