Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 13, Issue 11, Pages 1182-1185Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2011.08.050
Keywords
O-2 reduction; SAMs; Fe phthalocyanines; Au(111)
Categories
Funding
- Fondecyt [1100773, 1090627]
- Nucleo Milenio de Ingenieria Molecular [P07-006]
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We have obtained and characterized self assembled monolayers (SAMs) of 4-aminothiophenol (4-ATP) and 1-(4-mercaptophenyl)-2,6-diphenyl-4-(4-pyridyl)pyridinium tetrafluoroborate (MDPP) functionalized with iron phthalocyanine (FePc) adsorbed on gold (111) electrodes. The catalytic activity of these SAMs/FePc was examined for the reduction of O-2 in aqueous media (pH = 4) and compared with that of bare gold and of gold coated directly with FePc molecules. Scanning tunneling microscopy (STM) studies confirm the functionalization of the 4-ATP by FePc. The electrocatalytic studies carried out with Au/FePc, Au/4-ATP/FePc and Au/MDPP/FePc electrodes show that the O-2 reduction takes place by a 4-electron transfer to give water in contrast to a 2-electron-transfer process observed on the bare gold. The activity of the electrodes increases as follows: Au
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