Dependence of the kinetics of O2 dissolution at Pt on the conditions for adsorption of reaction intermediates

Damjanović, A.; Genshaw, M. A.

doi:10.1016/0013-4686(70)85021-6

Cited by 132 publications

(98 citation statements)

References 4 publications

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“…From our model simulation, at an overpotential of around 0.29 the oxygen-containing intermediate coverage is about 10%. The same coverage was reported as well at a cell potential of 0.84 V [40]. Furthermore, at an overpotential greater than 0.26 V, the free Pt sites dominate (i.e., coverage >50%).…”

Section: Model Simulationsupporting

confidence: 79%

“…For the ORR on a platinum (Pt) surface, two Tafel regions are generally observed in both acidic and alkaline solutions. At low current densities (high electrode potential), a Tafel slope of −60 mV dec −1 can be observed, whereas high current densities (low electrode potential) yield a Tafel slope of −120mVdec −1 [40]. The difference in Tafel slopes is attributable to partial coverage of the Pt surface by the oxygen-containing intermediates O and OH.…”

Section: Oxygen Reduction Reactionmentioning

confidence: 96%

“…Yet despite numerous studies of the ORR, the detailed mechanism remains elusive. Damjanovic and co-workers [40,45,46] proposed that the charge transfer to the adsorbed oxygen molecule, with or without simultaneous proton transfer, is the rate-determining step (associative model):…”

Section: Oxygen Reduction Reactionmentioning

confidence: 99%

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A general model for air-side proton exchange membrane fuel cell contamination

Shi

Song

et al. 2009

Journal of Power Sources

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. This paper presents a general model for air-side feed stream contamination that has the capability of simulating both transient and steady-state performance of a PEM fuel cell in the presence of air-side feed stream impurities. The model is developed based on the oxygen reduction reaction mechanism, contaminant surface adsorption/desorption, and electrochemical reaction kinetics. The model is then applied to the study of air-side toluene contamination. Experimental data for toluene contamination at four current densities (0.2, 0.5, 0.75 and 1.0 A cm −2 ) and three contamination levels (1, 5 and 10 ppm) were used to validate the model. In addition, it is expected that, with parameter adjustment, this model can also be used to predict performance degradation caused by other air impurities such as nitrogen oxides (NO x ) and sulfur oxides (SO x ). Crown

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Section: Model Simulationsupporting

confidence: 79%

Section: Oxygen Reduction Reactionmentioning

confidence: 96%

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A general model for air-side proton exchange membrane fuel cell contamination

Shi

Song

et al. 2009

Journal of Power Sources

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“…Damjanovic et al 94 explain this behavior by reference to the decreasing coverage of reaction intermediates with rising current density, corresponding to a change from Temkin to Langmuir adsorption. Tarasevich 95 and Markovic et al, 96 on the other hand, proposed the blocking of ORR by adsorbed oxygen species like Pt-OH to be responsible for the change to the Tafel slope.…”

mentioning

confidence: 99%

2-Sulfoethylammonium Trifluoromethanesulfonate as an Ionic Liquid for High Temperature PEM Fuel Cells

Wippermann

Wackerl

Lehnert

et al. 2015

J. Electrochem. Soc.

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Tafel Oxygen reduction reaction (ORR) in polymer electrolyte fuel cells (PEFC).-High temperature polymer electrolyte fuel cells (HT-PEFCs) are currently based on phosphoric acid-doped polybenzimidazole-type membranes (PBI) and are operated in a temperature range of 120-180• C. HT-PEFCs have several advantages over low temperature PEFCs, such as: easier water and heat management, the possibility of recovering high-grade waste heat, a more compact cooling system and a higher CO tolerance by the anode catalyst.However, a major drawback of HT-PEFCs is the sluggish oxygen reduction reaction (ORR) kinetics in the presence of phosphoric acid. This is primarily caused by three effects: (i) The inhibition effect of phosphoric acid on the ORR because of the poisoning of the Pt catalyst due to the adsorption of the H 3 PO 4 species onto active catalyst sites. (ii) The low solubility of oxygen in phosphoric acid. (iii) The slow diffusion of oxygen through the film of phosphoric acid which covers the platinum catalyst.The adsorption of phosphate by platinum has been studied for more than 30 years 1-15 by means of cyclic voltammetry (CV), [2][3][4][5]9,[11][12][13][14][16][17][18][19][20][21] rotating disc electrode measurements (RDE), [2][3][4][5]8,9,11,13,14 electrochemical impedance spectroscopy (EIS), 13,16,22 transient measurements, 9,23,24 Fourier transform infrared spectroscopy (FTIR), 20,25-27 electrochemical quartz crystal microbalance (QCM), 18 radio tracer experiments, 28 X-ray photoelectron spectroscopy (XPS) 17 and X-ray absorption spectroscopy (XAS). 14,15 The in-operando XAS measurements recently published by Kaserer et al. show the adsorption behavior of H 3 PO 4 species on Pt/C fuel cell cathode catalysts in the temperature range of 50-170• C under the operating conditions of an HT-PEFC. 15In diluted aqueous solutions and at moderate temperatures, sulphuric acid and sulfonic acids like methanesulfonic acid (MSA) or trifluoromethanesulfonic acid (triflic acid, TFMSA) have been found to be less poisonous than phosphoric acid because sulfonate groups are less strongly adsorbed on Pt. 3,29,30 For example, Zelenay et al.,29 in a comparative study of phosphoric acid and TFMSA, showed that * Electrochemical Society Active Member. z E-mail: k.wippermann@fz-juelich.de 0.02 M TFMSA is indeed less strongly adsorbed by comparison to 0.02 M phosphoric acid at room temperature. However, the free space available for oxygen reduction is found to be similar at elevated temperatures and for concentrated solutions. 29 Under these conditions, the advantage of TFMSA lies in its higher oxygen solubility and diffusivity rather than its poisoning effect. 29 Although this result cannot be generalized, it still indicates the importance of oxygen solubility and the diffusion coefficient of oxygen in the electrolyte being used. Proton conducting ionic liquids (PIL).-With respect to alternative electrolytes for HT-PEFCs, proton-conducting ionic liquids (PILs) appear to be suitable, as they do not rely on solvents like water. Moreover...

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“…Here, there are no interactions between the adsorbed species and only a monolayer is formed [52]. This phenomenon was discernible in both acidic and alkaline electrolytes, too [57]. In Fig.…”

Section: Electrochemical Measurements 331 Oxygen Reduction Reactiomentioning

confidence: 95%

One step synthesis of chlorine-free Pt/Nitrogen-doped graphene composite for oxygen reduction reaction

Varga

Ballai

et al. 2018

Carbon

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Dependence of the kinetics of O2 dissolution at Pt on the conditions for adsorption of reaction intermediates

Cited by 132 publications

References 4 publications

A general model for air-side proton exchange membrane fuel cell contamination

A general model for air-side proton exchange membrane fuel cell contamination

2-Sulfoethylammonium Trifluoromethanesulfonate as an Ionic Liquid for High Temperature PEM Fuel Cells

One step synthesis of chlorine-free Pt/Nitrogen-doped graphene composite for oxygen reduction reaction

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