Influence of Nafion® film on the kinetics of anodic hydrogen oxidation

Maruyama, Jun; Inaba, Masaaki; Katakura, Katsumi; Ogumi, Zempachi; Takehara, Zen‐ichiro

doi:10.1016/s0022-0728(98)00004-7

Cited by 86 publications

(93 citation statements)

References 15 publications

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“…[15][16][17] However, high-mass-transport methods such as UME voltammetry, 18 scanning electrochemical microscopy (SECM), 19 floating-electrode voltammetry, 20 and H 2 -pumping methods 21,22 have yielded j 0 values in the range 20-80 mA cm -2 , 21 in reasonable agreement with that suggested by the performance of PEMFC anodes. 23 The adsorption of atomic hydrogen (often dubbed underpotential-deposited hydrogen, H upd ) onto Pt at potentials negative of 0.3 V vs. the reversible hydrogen electrode potential (Equation 5) is also of fundamental and applied interest to electrochemists.…”

Section: Introductionsupporting

confidence: 53%

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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Section: Introductionsupporting

confidence: 53%

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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“…The smaller value suggests that part of the Pt surface is blocked by the electrochemically inactive hydrophobic fluorocarbon backbone of Nafion ® [5]. Optimal performance was reported for coatings composed of less than 9 wt.…”

Section: Figure 1: Electrochemical Actuator: (A) Operation Concept Anmentioning

confidence: 99%

High efficiency wireless electrochemical actuators: Design, fabrication and characterization by electrochemical impedance spectroscopy

Sheybani

Meng

2011

2011 IEEE 24th International Conference on Micro Electro Mechanical Systems

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A wirelessly-actuated high efficiency Nafion ® -coated MEMS electrochemical actuator is presented. For the first time, high flow rates were achieved (up to 141μL/min, 13mA) under wireless operation and high efficiency pumping (up to 97%) was obtained with Nafion ® -coated electrodes; coating further prevented previously reported current-induced damage to electrodes [1]. Electrochemical impedance spectroscopy (EIS) was used for electrode characterization, electrochemical cleaning, as well as investigation of delamination, electrode polymer coating and surface activation. Parylene and PEEK were investigated as flexible substrate substitutes for soda lime glass. As a result of the combined effect of the rough PEEK surface (increased electrode surface area) and the Nafion ® coating, higher efficiency was achieved compared to glass.

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“…Platinum is so far the most effective electrocatalytic system with respect to its high activity towards reduction of oxygen [1][2][3][4][5] and oxidation of hydrogen [6][7][8][9][10]. Nevertheless, due to high cost of the noble metal, there has been growing interest in minimizing platinum content and development of materials containing highly dispersed platinum nanoparticles that can provide large surface areas necessary for efficient heterogeneous electrocatalysis [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic properties of platinum nanocenters electrogenerated at ultra-trace levels within zeolitic phosphododecatungstate cesium salt matrices

Kolary-Zurowska

Zurowski

Dsoke

et al. 2014

J Solid State Electrochem

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A unique preparation method of obtaining stable composite film (with ultra-low platinum content) highly active towards oxygen reduction and hydrogen oxidation is presented here. The matrix for platinum centers consists of highsurface-area zeoli te-t ype aci dic salt of cesium phosphododecatungstate (Cs 2.5 H 0.5 PW 12 O 40 ) admixed with carbon (Vulcan XC-72) carriers. Platinum nanoparticles were deposited on the working electrode modified with matrix via corrosion of platinum counter electrode during cyclic voltammetry experiment conducted in acid electrolyte containing chloride ions. The results obtained from rotating disk voltammetry revealed that the composite film containing Pt nanoparticles at very low loadings (on the level of 2-5 μg cm −2 ) demonstrated remarkable electrocatalytic activity towards both oxygen reduction and hydrogen oxidation, particularly, when compared to the performance of the Cs 2.5 H 0.5 PW 12 O 40 -free system (i.e., containing only Vulcan support) prepared and examined under analogous conditions. The phenomenon should be primarily ascribed to the mesoporous nature of the matrix enabling immobilization and stabilization of small catalytic nanoparticles (1-2 nm diameters) inside the pores as well as to high surface acidity of the polyoxometalate-based salt providing proton-rich environment at the electrocatalytic interface.

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Influence of Nafion® film on the kinetics of anodic hydrogen oxidation

Cited by 86 publications

References 15 publications

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

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

High efficiency wireless electrochemical actuators: Design, fabrication and characterization by electrochemical impedance spectroscopy

Electrocatalytic properties of platinum nanocenters electrogenerated at ultra-trace levels within zeolitic phosphododecatungstate cesium salt matrices

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