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Article

Tuning the Covering on Gold Surfaces by Grafting Amino-Aryl Films Functionalized with Fe(II) Phthalocyanine: Performance on the Electrocatalysis of Oxygen Reduction

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Universidad de Santiago de Chile (USACH), Faculty of Chemistry and Biology, Department of Chemistry of the Materials, Soft Matter Research and Technology Center, SMAT-C. Av. Libertador B. O’Higgins 3363, Box 40, Correo 33, Santiago 9170022, Chile
2
Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso 2374631, Chile
*
Authors to whom correspondence should be addressed.
Academic Editor: Jan Janczak
Molecules 2021, 26(6), 1631; https://doi.org/10.3390/molecules26061631
Received: 12 February 2021 / Revised: 12 March 2021 / Accepted: 13 March 2021 / Published: 15 March 2021
(This article belongs to the Special Issue The Advances of Metallophthalocyanines)
Current selective modification methods, coupled with functionalization through organic or inorganic molecules, are crucial for designing and constructing custom-made molecular materials that act as electroactive interfaces. A versatile method for derivatizing surfaces is through an aryl diazonium salt reduction reaction (DSRR). A prominent feature of this strategy is that it can be carried out on various materials. Using the DSRR, we modified gold surface electrodes with 4-aminebenzene from 4-nitrobenzenediazonium tetrafluoroborate (NBTF), regulating the deposited mass of the aryl film to achieve covering control on the electrode surface. We got different degrees of covering: monolayer, intermediate, and multilayer. Afterwards, the ArNO2 end groups were electrochemically reduced to ArNH2 and functionalized with Fe(II)-Phthalocyanine to study the catalytic performance for the oxygen reduction reaction (ORR). The thickness of the electrode covering determines its response in front of ORR. Interestingly, the experimental results showed that an intermediate covering film presents a better electrocatalytic response for ORR, driving the reaction by a four-electron pathway. View Full-Text
Keywords: grafting covering control; aryl diazonium salt; Fe(II) Phthalocyanine; oxygen reduction reaction grafting covering control; aryl diazonium salt; Fe(II) Phthalocyanine; oxygen reduction reaction
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MDPI and ACS Style

Olguín, C.F.; Agurto, N.; Silva, C.P.; Candia, C.P.; Santander-Nelli, M.; Oyarzo, J.; Gómez, A.; Silva, J.F.; Pavez, J. Tuning the Covering on Gold Surfaces by Grafting Amino-Aryl Films Functionalized with Fe(II) Phthalocyanine: Performance on the Electrocatalysis of Oxygen Reduction. Molecules 2021, 26, 1631. https://doi.org/10.3390/molecules26061631

AMA Style

Olguín CF, Agurto N, Silva CP, Candia CP, Santander-Nelli M, Oyarzo J, Gómez A, Silva JF, Pavez J. Tuning the Covering on Gold Surfaces by Grafting Amino-Aryl Films Functionalized with Fe(II) Phthalocyanine: Performance on the Electrocatalysis of Oxygen Reduction. Molecules. 2021; 26(6):1631. https://doi.org/10.3390/molecules26061631

Chicago/Turabian Style

Olguín, Camila F., Nicolás Agurto, Carlos P. Silva, Carolina P. Candia, Mireya Santander-Nelli, Juan Oyarzo, Alejandra Gómez, Juan F. Silva, and Jorge Pavez. 2021. "Tuning the Covering on Gold Surfaces by Grafting Amino-Aryl Films Functionalized with Fe(II) Phthalocyanine: Performance on the Electrocatalysis of Oxygen Reduction" Molecules 26, no. 6: 1631. https://doi.org/10.3390/molecules26061631

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