Effect of surface structure of platinum single crystal electrodes on the electrochemical reduction of CO2 in methanol-water mixtures

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Title: Effect of surface structure of platinum single crystal electrodes on the electrochemical reduction of CO2 in methanol-water mixtures
Authors: Cardenas, Betzhy | Climent, Victor | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: CO2 reduction | Platinum single crystal electrode | Methanol water mixtures | Cyclic voltammetry | Hanging meniscus rotating disk electrode | FTIRRAS spectroscopy
Knowledge Area: Química Física
Issue Date: 15-May-2017
Publisher: Elsevier
Citation: Journal of Electroanalytical Chemistry. 2017, 793: 157-163. doi:10.1016/j.jelechem.2016.12.047
Abstract: The reduction of CO2 on platinum single crystal electrodes has been investigated in methanol/water mixtures. The reaction is sensitive to the crystallographic structure of the surface, with the (111) triangular arrangement of atoms being the most active site. Use of stepped surfaces revealed that long range order has little effect on the reaction rate. On the other hand, the (100) site is the less active. The combination of the results of a voltammetric study using different scan rate and the use of a hanging meniscus rotating disk electrode configuration with different rotation speeds suggests the reaction rate is limited by a chemical step at large overvoltages. The nature of this chemical step is uncertain but different possibilities are discussed. The Tafel slope suggests that the rate determining step is the first electron transfer at low overvoltages while at high overvoltages the rate of the first chemical step limits the rate of CO2 reduction.
Sponsor: Financial support from MINECTO through projects CTQ2013-44083-P and PCIN-2013-046 is greatly acknowledged. B. Cardenas also acknowledges the Generalitat Valenciana for the award of a Santiago Grisolia Grant.
URI: http://hdl.handle.net/10045/68995
ISSN: 1572-6657 (Print) | 1873-2569 (Online)
DOI: 10.1016/j.jelechem.2016.12.047
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier B.V.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.jelechem.2016.12.047
Appears in Collections:INV - EQSUP - Artículos de Revistas

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