Use of CO as a Cleaning Tool of Highly Active Surfaces in Contact with Ionic Liquids: Ni Deposition on Pt(111) Surfaces in IL

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Title: Use of CO as a Cleaning Tool of Highly Active Surfaces in Contact with Ionic Liquids: Ni Deposition on Pt(111) Surfaces in IL
Authors: Sebastián, Paula | Tułodziecki, Michał | Bernicola, María del Pilar | Climent, Victor | Gómez, Elvira | Shao-Horn, Yang | 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: Room temperature ionic liquid | Deep eutectic solvent | Carbon monoxide oxidation | Interfacial water | Phase transition | Nickel electrodeposition
Knowledge Area: Química Física
Issue Date: 20-Aug-2018
Publisher: American Chemical Society
Citation: ACS Applied Energy Materials. 2018, 1(9): 4617-4625. doi:10.1021/acsaem.8b00776
Abstract: This work proposes a pretreatment strategy of a flame-annealed Pt(111) single crystal ensuring surface ordering and avoiding water surface contamination for experiments in ionic liquid (IL) media. A room temperature ionic liquid (RTIL) and a deep eutectic solvent (DES) representative of two families of ionic liquids were selected as test electrolytes: The RTIL used was the 1-ethyl-2,3-dimethylimidazolium bis(trifluoromethyl)sulfonylimide ([Emmim][Tf2N]), and the DES was based on the eutectic mixture of choline chloride (ChCl) and urea (1ChCl:2urea molar ratio). The electrode was flame-annealed and, instead of the water quenching step, it was cooled down in CO atmosphere until the surface was fully covered by a protective carbon monoxide (CO) layer. Prior to experiments, the removal of CO from the surface was performed by electrochemical oxidation. The CO reactivity on Pt(111) was different depending on the IL nature. While CO is easily oxidized to CO2 in [Emmim][Tf2N], in DES, CO remains adsorbed on the substrate and restructures undergoing an order–disorder transition. For both liquids, the proposed method allows for obtaining neat blank cyclic voltammograms, demonstrating that the adsorption of CO is a useful tool to protect the high catalytic surfaces, such as Pt in contact with ILs. To illustrate the feasibility of the CO treatment in electrochemical work with ILs, the general trends for the modification of Pt(111) single crystal surface with metallic nickel nanostructures on both types of IL was investigated. Nickel electrodeposition on the Pt(111) substrate was explored in both [Emmim][Tf2N] and DES by using classical electrochemical techniques, such as cyclic voltammetry and chronoamperometry, while the deposits were characterized by FE-SEM, EDS, and XPS.
Sponsor: This work has been financially supported by the MCINN-FEDER (Spain) through the projects: CTQ2016-76221-P and TEC2017-85059-C3-2R. P. Sebastian acknowledges MECD for the award of a FPU grant.
ISSN: 2574-0962
DOI: 10.1021/acsaem.8b00776
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 American Chemical Society
Peer Review: si
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Appears in Collections:INV - EQSUP - Artículos de Revistas

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