Surface-Sensitive Electrooxidation of Carbon Monoxide in Room Temperature Ionic Liquids

Hanc-Scherer, Florin A.; Sánchez‐Sánchez, Carlos M.; Ilea, Petru; Herrero, Enrique

doi:10.1021/cs4007364

Cited by 19 publications

(44 citation statements)

References 25 publications

(34 reference statements)

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“…As was previously proposed by Hanc-Scherer et al [26], these higher CO stripping charge densities may be explained by a concomitant oxidation and/or adsorption of other species promoted by CO adsorption and oxidation on Pt. In this regard, the difference between the two RTILs would be easily …”

Section: Figure 1 Shows Representative Tem and Hrtem Images Of The Sysupporting

confidence: 71%

“…Comparing both voltammograms shown in figure 7A, it is easy to realize that the charge involved in the CO ads electrooxidation in respectively. An important part of this large difference between the charge density values reported here and those reported by Hanc-Scherer et al [26] is due to the different method employed for subtracting the secondary competitive reactions involved, being more accurate the approach presented here and based on subtracting the following voltammogram after CO ads stripping. ] are obtained.…”

Section: Figure 1 Shows Representative Tem and Hrtem Images Of The Sycontrasting

confidence: 64%

“…are obtained. These charges densities are about 3 and 2 times higher, respectively, than the expected one from aqueous solution, but importantly much lower than those found in Pt(hkl) surfaces [26].…”

Section: Figure 1 Shows Representative Tem and Hrtem Images Of The Sycontrasting

confidence: 52%

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Electrochemical reactivity and stability of platinum nanoparticles in imidazolium-based ionic liquids

Montiel

Solla-Gullón

Sánchez‐Sánchez

2015

J Solid State Electrochem

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Section: Figure 1 Shows Representative Tem and Hrtem Images Of The Sysupporting

confidence: 71%

Section: Figure 1 Shows Representative Tem and Hrtem Images Of The Sycontrasting

confidence: 64%

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Electrochemical reactivity and stability of platinum nanoparticles in imidazolium-based ionic liquids

Montiel

Solla-Gullón

Sánchez‐Sánchez

2015

J Solid State Electrochem

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“…The opposite is observed in the fitting Pt in ionic liquids, it is likely that electrochemical measurements must be performed using single-crystal electrodes, an area of research that is just developing. 54 Curve fits were attempted using values of m r = 2 and 1, and by far the best fits were obtained when m r = 1. This corresponds to the Heyrovsky-Volmer mechanism (Equations 3 and 4), which we note is the same as that determined for the HER at Pt in a number of aprotic RTILs based on the bis(trifluoromethanesulfonyl)imide anion.…”

Section: Hor Electrooxidation In [Demamentioning

confidence: 99%

Hydrogen Electrooxidation under Conditions of High Mass Transport in Room-Temperature Ionic Liquids and the Role of Underpotential-Deposited Hydrogen

Goodwin

Walsh

2016

J. Phys. Chem. C

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. (2016) Hydrogen electrooxidation under conditions of high mass transport in room-temperature ionic liquids and the role of underpotential-deposited hydrogen. Journal of Physical Chemistry C, 120 (21). pp. 11498-11507. ISSN 1932-7455 Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/33911/1/Article%20jp-2016-01592f.R2.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the University of Nottingham End User licence and may be reused according to the conditions of the licence. For more details see: http://eprints.nottingham.ac.uk/end_user_agreement.pdf A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractThe hydrogen oxidation reaction (HOR), an electrocatalytic reaction of fundamental and applied interest, was studied in the protic ionic liquid (PIL) diethylmethylammonium trifluoromethanesulfonate, [dema][TfO], at Pt electrodes using rotating disk electrode (RDE) and ultramicroelectrode (UME) voltammetry. A steady-state HOR current is observed during RDE voltammetry at overpotentials > 50 mV but an additional plateau is observed in the overpotential region 50-200 mV when using UMEs. The difference in voltammetric responses is attributed to higher rate of mass transport to the UME than to the RDE. Three models have been used to fit the experimental data. The first is a dual-pathway model, which assumes that the Tafel-Volmer and Heyrovsky-Volmer pathways are both active over the potential range of interest and no blockage of catalytic sites occurs during the reaction. The second is a dual-pathway model, which assumes that reaction intermediates block access of H 2 to catalytic sites. The third is based on the premise that underpotential-deposited hydrogen atoms (H upd ) can block adsorption and electrooxidation of H 2 at the Pt surface. While each model fits the polarisation curves reasonably well, detailed analysis suggests that the H updblocking model describes the responses better. To the best of our knowledge, this work is the first to demonstrate the advantages of UME voltammetry over RDE voltammetry for studying electrocatalytic reactions in PILs, and the first to show that H upd can inhibit an electrocatalytic reactions in an ionic liquid, a factor that may become important as the technological applications of these liquids increase.3

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“…One could argue that our understanding of electrocatalysis and the role that spectator ions play during electrocatalysis is inapplicable in RTILs and that a new body of knowledge must be developed before we can understand electrocatalysis in RTILs and develop electrocatalysts specifically for use in RTIL-based electrochemical energy-conversion devices. In recent years, a few groups have begun to study reactions such as the HOR, ORR, methanol oxidation reaction (MOR) and CO oxidation reaction (COOR) in RTILs [24][25][26][27][28][29][30]. Some of these studies have focussed on the development of electrochemical energyconversion devices and others have focussed primarily on the fundamental electrochemical and kinetic insights that such measurements can yield.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalysis in Room Temperature Ionic Liquids

Ejigu

Walsh

2015

Electrochemistry in Ionic Liquids

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Due to their high thermal and electrochemical stabilities, low vapour pressures, and the ability to readily alter their properties by changing the identity of the constituent ions, RTILs are being used as electrolytes in an increasing number of electrochemical investigations [1][2][3][4]. For example, many fundamental studies have explored the effects of changing the compositions of RTILs on parameters such as their viscosities and electrochemical windows, which are often up to 5 V wide [5,6]. The effects of the RTIL environment on molecular diffusion and electron transfer dynamics have also been studied in detail using simple redox species such as ferrocene [7][8][9]. Such studies have revealed that molecular diffusion coefficients are often up to three orders of magnitude lower in RTILs than in conventional aqueous and nonaqueous electrolytes due to the relatively high viscosities of most RTILs.In parallel with fundamental investigations into the electrochemical behaviour of RTILs, many groups have begun to use RTILs as electrolytes in electrochemical energy-conversion and storage devices. The high thermal stabilities of many RTILs have prompted the development of safer Li batteries by substituting RTILs for volatile and flammable organic electrolytes [10,11]. A number of groups have also begun to use RTILs as electrolytes in intermediate temperature (>100 C) fuel cells because, unlike the Nafion electrolytes usually used in proton exchange membrane fuel cells (PEMFCs), many RTILs can conduct protons in the absence of bulk water [12][13][14][15]. Due to the wide electrochemical windows of some RTILs, large amounts of energy can be stored in RTIL-based supercapacitors [16]. As these examples show, RTILs undoubtedly exhibit many properties that make them attractive for use in electrochemical energy conversion and storage. However, sluggish mass

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Surface-Sensitive Electrooxidation of Carbon Monoxide in Room Temperature Ionic Liquids

Cited by 19 publications

References 25 publications

Electrochemical reactivity and stability of platinum nanoparticles in imidazolium-based ionic liquids

Electrochemical reactivity and stability of platinum nanoparticles in imidazolium-based ionic liquids

Hydrogen Electrooxidation under Conditions of High Mass Transport in Room-Temperature Ionic Liquids and the Role of Underpotential-Deposited Hydrogen

Electrocatalysis in Room Temperature Ionic Liquids

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