Arsenic specie interactions with a porous carbon electrode as determined with an electrochemical quartz crystal microbalance

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Title: Arsenic specie interactions with a porous carbon electrode as determined with an electrochemical quartz crystal microbalance
Authors: Morallon, Emilia | Arias Pardilla, Joaquín | Calo, José Manuel | Cazorla-Amorós, Diego
Research Group/s: Electrocatálisis y Electroquímica de Polímeros | Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales | Brown University. Division of Engineering
Keywords: Arsenic species | Porous carbon electrode | Electrochemical quartz crystal microbalance | Electroadsorption | Cyclic voltammetry
Knowledge Area: Química Física
Issue Date: 20-Feb-2009
Publisher: Elsevier
Citation: MORALLÓN NÚÑEZ, Emilia, et al. “Arsenic specie interactions with a porous carbon electrode as determined with an electrochemical quartz crystal microbalance". Electrochimica Acta. Vol. 54, Issue 16 (30 June 2009). ISSN 0013-4686, pp. 3996-4004
Abstract: The interactions of arsenic species with platinum and porous carbon electrodes were investigated with an electrochemical quartz crystal microbalance (EQCM) and cyclic voltammetry in alkaline solutions. It is shown that the redox reactions in arsenic-containing solutions electrocatalyzed by Pt can be readily distinguished with the EQCM. This approach was used to show that the porous carbon electrode electrocatalyzes the redox reactions of arsenic species in a manner analogous to that of the bare Pt electrode. This could not be ascertained with just classical cyclic voltammetry alone due to the obfuscation of the faradaic features with the large capacitative effects of the carbon double layer. For the porous carbon electrode, a continual mass loss was always observed during potential cycling, with or without arsenic in the solution. This was attributed to electrogasification of the carbon. The apparent mass loss per cycle was observed to decrease with increasing arsenic concentration. This was attributed to a net mass increase in adsorbed arsenic per cycle that increased with arsenic concentration, offsetting the carbon mass loss. Apparently, additional carbon adsorption sites involved in arsenic species interactions seem to be created during electrogasification, thereby augmenting the net uptake of arsenic per cycle. It is demonstrated that EQCM is a very useful technique for distinguishing arsenic species interactions with carbon electrodes. It may also prove to be effective for investigating redox/adsorption desorption characteristics of other species in solution with carbon materials as well.
Sponsor: This work was partially supported by grant number 5 P42 (2006) ES013660 from the U.S. National Institute of Environmental Health Sciences (NIEHS), NIH, and by the Generalitat Valenciana (RED ARVIV/2007/076) and Ministerio de Educación y Ciencia (Project CTQ2006-08958/PPQ). The authors also wish to acknowledge the following: E. Morallon to the Generalitat Valenciana for a travel grant (BEST/2007/038); J.M. Calo for support from the Programa de Ayuda para Investigadores Senior, 2006, from the Universidad de Alicante; and D. Cazorla-Amorós for a travel grant (PR2007-177) from the MEC (Spain).
ISSN: 0013-4686 (Print) | 1873-3859 (Online)
DOI: 10.1016/j.electacta.2009.02.023
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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INV - MCMA - Artículos de Revistas

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