Investigating interfacial parameters with platinum single crystal electrodes

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Title: Investigating interfacial parameters with platinum single crystal electrodes
Authors: Martínez-Hincapié, Ricardo | Sebastián, Paula | 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: Platinum single crystal | Electrochemical double layer | Potential of zero total charge | Potential of zero free charge | Laser induced temperature jump | Potential of maximum entropy
Knowledge Area: Química Física
Issue Date: Mar-2017
Publisher: Pleiades Publishing
Citation: Russian Journal of Electrochemistry. 2017, 53(3): 227-236. doi:10.1134/S1023193517030107
Abstract: The concepts of total and free charge of platinum single crystal electrodes are revised in this paper, together with the associated concepts of potential of zero total and free charge. Total charges can be measured from CO displacement method. Results on solution of different pH are described. A novel buffer composition is used to attain pH values close to neutrality while avoiding interferences from anion adsorption processes. Stress is made on the fact that free charges are not accessible through electrochemical measurement for systems at equilibrium since adsorption processes (hydrogen and hydroxyl) interfere with free charge determination. Still, a model is described that allows, under some assumptions, extract free charge values and the corresponding potential of zero free charge for Pt(111) electrodes. On the other hand, fast measurement outside equilibrium can separate free charges from adsorption processes based on their different time constant. In this way, the laser induced temperature jump experiment allows determination of the potential of maximum entropy, a magnitude that is intimately related with the potential of zero free charge. Values of the potential of maximum entropy as a function of pH are given for the different basal planes of platinum.
Sponsor: Support from MINECO (Spain) through project CTQ 2016-76221-P and Generalitat Valenciana through project PROMETEOII/2014/013 is greatly acknowledged. RMH thankfully acknowledges support from Generalitat Valenciana under the Santiago Grisolia Program (GRISOLIA/2013/008). P. Sebastian also acknowledges MECD for the award of a FPU grant.
ISSN: 1023-1935 (Print) | 1608-3342 (Online)
DOI: 10.1134/S1023193517030107
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Pleiades Publishing, Ltd. 2017
Peer Review: si
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Appears in Collections:INV - EQSUP - Artículos de Revistas

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