A rotating disk electrode study on catalytic activity of iron(II) phthalocyanine-modified electrodes for oxygen reduction in acidic media

Catalytic activity of monometric metal macrocycles for oxygen reduction reaction (ORR) was investigated using rotating disk electrode voltammetry in acidic media. Iron(II) phthalocyanines (FePc) and cobalt(II) tetraphenylporphyrins (CoTPP) were immobilized on Au surfaces through molecular wires with...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2021-01, Vol.25 (1), p.141-147
Main Authors: Toyama, Tatsuya, Sato, Shino, Motobayashi, Kenta, Uosaki, Kohei, Ikeda, Katsuyoshi
Format: Article
Language:English
Subjects:
Analytical Chemistry
Catalytic activity
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Electrochemistry
Electrodes
Electrons
Energy Storage
Gold
Iron
Ligands
Original Paper
Oxygen reduction reactions
Physical Chemistry
Rotating disks
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Summary:Catalytic activity of monometric metal macrocycles for oxygen reduction reaction (ORR) was investigated using rotating disk electrode voltammetry in acidic media. Iron(II) phthalocyanines (FePc) and cobalt(II) tetraphenylporphyrins (CoTPP) were immobilized on Au surfaces through molecular wires with different terminal groups of pyridine and isocyanide. The measured ORR behavior of FePc was largely influenced by the axial ligand while CoTPP promoted only the two-electron reaction regardless of the axial ligand. The FePc immobilized with pyridine was easily detached from the surface under the ORR condition, and was able to promote the four-electron reaction only under the high overpotential application. The FePc with isocyanide was more stable with the activity for the four-electron reaction, due to stronger electron donation to Fe central ions.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-019-04461-9