The Nature of the Electro‐Oxidative Catalytic Response of Mixed Metal Oxides: Pt‐ and Ru‐Doped SnO2 Anodes

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Title: The Nature of the Electro‐Oxidative Catalytic Response of Mixed Metal Oxides: Pt‐ and Ru‐Doped SnO2 Anodes
Authors: Berenguer Betrián, Raúl | Quijada Tomás, César | Morallon, Emilia
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Pt-doped tin dioxide electrodes | Ru-doped tin dioxide electrodes | DSA | Electrocatalysis | Impedance spectroscopy
Knowledge Area: Química Física
Issue Date: 15-Feb-2019
Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
Citation: ChemElectroChem. 2019, 6(4): 1057-1068. doi:10.1002/celc.201801632
Abstract: The catalytic behavior of metal oxides for oxidative reactions is generally classified into active or non‐active, depending on whether surface redox species participate or not. In the case of mixed metal oxides, however, this simplified scenario may be more complex. Non‐active oxides containing electroactive metal species, like Pt‐ and/or Ru‐doped SnO2 electrodes, are promising anode materials for the electrochemical treatment of wastewaters. This work analyzes the effect of Pt and Ru species on the nature of the electro‐oxidative catalytic response of Ti/SnO2 anodes. For this purpose, the electro‐oxidation of phenol and the competing oxygen evolution reaction (OER) in NaOH have been chosen as model reactions. The different electrodes and reactions were characterized by cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel measurements. The obtained results reveal that both Pt and Ru introduce solid‐state redox processes and catalyze the OER and the phenol oxidation onto Ti/SnO2‐based electrodes. Nevertheless, the dopants induce quite different active behaviors in the mixed oxides. Pt practically does not affect the OER mechanism, but enhances its kinetics, so its electrocatalytic activity is associated with a specific adsorption of hydroxyl anions or phenolate on Pt sites, without participation of the irreversible Pt/PtOx couple (i. e. a “non‐redox‐active” behavior). On the contrary, Ru species involve various and highly reversible redox processes that accelerate and modify the rate‐determining step of the OER, and that actively mediate in the phenol oxidation.
Sponsor: Financial support from the Spanish Ministerio de Economía y Competitividad and FEDER funds (MAT2016-76595-R, IJCI-2014-20012) is gratefully acknowledged.
ISSN: 2196-0216
DOI: 10.1002/celc.201801632
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Peer Review: si
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Appears in Collections:INV - GEPE - Artículos de Revistas

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