Electroprecipitation of Ag(II)/Ag(III) tetraphenylsulfonate porphyrin and electrocatalytic behavior of the films |
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| Affiliation: | 1. N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia;2. Institute for Energy Problems of Chemical Physics, Russian Academy of Sciences, Moscow, Russia;3. Moscow Institute of Physics and Technology, Dolgoprudny, Moscow region, Russia;4. Skolkovo Institute of Science and Technology, Skolkovo, Russia;1. Department of Chemistry, Faculty of Arts and Sciences, Sakarya University, Serdivan, Sakarya 54187, Turkey;2. Polimer Tekmer Polymer Materials and Technologies Research Application Center, Functional Powder, Dye and Pigment Technology Lab. Sargem Research-Development and Application Center, Sakarya University, Serdivan, Sakarya 54187, Turkey;3. Faculty of Engineering, Department of Biomedical Engineering, Eskisehir Osmangazi University, Eskisehir 26040, Turkey;1. CONACYT-División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C.,San Luis Potosí, SLP 78216, México;2. Cinvestav IPN, Unidad Mérida, Depto. de Física Aplicada, A.P. 73-Cordemex, Mérida, Yucatán 97310, México;3. Universidad de Guanajuato, División de Ciencias e Ingenierías, León, Guanajuato 37150, México;4. Facultad de Ciencias Físico Matemáticas Universidad Autónoma de Coahuila, Edif. A Unidad Camporredondo, Saltillo 25000, México |
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| Abstract: | The electrochemical precipitation on glassy carbon and gold electrodes of Ag(II) tetraphenylsulfonate porphyrin (Ag(II)TPPS) from aqueous HClO4 solutions, is reported. Electrochemical quartz crystal microbalance (EQCM) results indicate the possible formation of an Ag(II)–Ag(III) porphyrin dimer species. This species is oxidized and reduced in two consecutive steps: oxidation at +0.31 and +0.36 V (vs. SCE) and reduction at +0.11 and +0.07 V. The films show catalytic behavior toward O2 reduction in 10−2 M HClO4 at relatively low potentials (E<−0.1 V) but catalyze NO reduction at relatively high-reduction potentials (E<0.4 V). The electrochemical results seem to indicate that the catalytic cycle in the case of NO involves formation of Ag(II)TPPS–Ag(II)TPPS(NO)+ and its electroreduction to regenerate Ag(II)TPPS–Ag(III)TPPS and NO-reduction products. |
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