Oscillation Phenomena on the Cell Voltage of PEFCs During CO Poisoning

Fukumoto, Hisatoshi; Maeda, Hideo; Mitsuda, Kenro

doi:10.5796/electrochemistry.68.794

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…The measurements were performed after cell voltage became stable, and the minimum cell voltages were recorded because of the cell voltage vibration phenomena by CO poisoning. 30 Voltage losses with Pt-Ti alloys for the H 2 fuel containing 100 ppm CO were smaller than those with Pt. Especially, voltage loss with Pt1Ti1͑900͒/C was eight times lower than that with Pt͑200͒/C at the current density of 200 mA cm −2 , i.e., CO tolerance was actually improved by alloying with Ti.…”

Section: Resultsmentioning

confidence: 92%

Preparation and Electrochemical Activities of Pt–Ti Alloy PEFC Electrocatalysts

Kawasoe¹,

Tanaka²,

Kuroki³

et al. 2007

J. Electrochem. Soc.

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Titanium is one of the most stable materials, remaining undissolved under strongly acidic polymer electrolyte fuel cell ͑PEFC͒ conditions. Nanocrystalline Pt-Ti alloy electrocatalysts with a catalyst grain size of several nanometers have been successfully prepared by the colloidal and sol-gel method, characterized by X-ray diffraction, field-emission scanning electron microscope, scanning transmission electron microscope, energy-dispersive X-ray analysis, and X-ray photoelectron spectroscopy. Electrochemical activities were evaluated by current-voltage characteristics measurements using membrane electrode assemblies for humidified H 2 fuels with or without 100 ppm CO, cyclic voltammetry, and CO-stripping voltammetry in 0.1 M HClO 4 . Pt-Ti alloy electrocatalysts exhibited higher electrochemical performance than pure Pt catalyst, i.e., higher activity for oxygen reduction reactions and improved CO tolerance.

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Section: Resultsmentioning

confidence: 92%

Preparation and Electrochemical Activities of Pt–Ti Alloy PEFC Electrocatalysts

Kawasoe¹,

Tanaka²,

Kuroki³

et al. 2007

J. Electrochem. Soc.

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“…Experimental and theoretical studies have revealed nonlinear responses, such as multiple steady states as well as periodic oscillations. Studied oscillations in PEMFCs can result from either poisoning effects of the catalysts (26) or complex water management. The study of the current oscillations under low cathode hydration has been the focus of several research groups recently, with the aim of understanding the variables that control the phenomenon and its origin (11,(27)(28)(29).…”

Section: Introductionmentioning

confidence: 99%

Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design

2013

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Oscillatory fluctuations of a single proton exchange membrane fuel cell appear upon operation with a dry cathode air supply and a fully humidified anode stream. Periodic transitions between a low-and high-current operation point of the oscillating state due to the balance of drying and wetting processes in combination with water transport have been observed previously; however, several new aspects have been investigated in the present study, providing insight into the initiation processes. The oscillations are caused by periodic flow type changes from one-to two-phase flow in the anodic channels of the flow field. It has been observed that cell orientation with respect to Earth's gravity field affects the liquid water distribution in the anodic flow channels and, thus, also affects the oscillatory behavior of the cell performance.

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Suppression of Potential Oscillations in PEFCs by Using Anode Catalyst Prepared by Polygonal Barrel‐Sputtering Method

et al. 2010

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In this study, we investigated the suppression of potential oscillations that occur while feeding H2 gas including a large amount of CO to polymer electrolyte fuel cells. A carbon‐supported Pt–Ru alloy (Pt–Ru/C) sample was prepared by the polygonal barrel‐sputtering method. Electrochemical measurement was conducted in 1 N H2SO4 electrolyte solution saturated with H2 gas including CO of 1,000 ppm. From the measurement, it was found that the prepared Pt–Ru/C sample showed higher CO tolerance than a commercially available sample, and therefore, potential oscillations in the case of the prepared sample occurred for slightly longer intervals. Additional samples were prepared by sputtering different amounts of Ru on the prepared Pt–Ru/C sample, and it was observed that the average interval of potential oscillations increased with the amount of Ru. This result suggests that in the case of the polygonal barrel‐sputtering method, Ru plays an important role in suppressing potential oscillations and influences the CO tolerance of Pt–Ru/C.

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Oscillation Phenomena on the Cell Voltage of PEFCs During CO Poisoning

Cited by 7 publications

References 5 publications

Preparation and Electrochemical Activities of Pt–Ti Alloy PEFC Electrocatalysts

Preparation and Electrochemical Activities of Pt–Ti Alloy PEFC Electrocatalysts

Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design

Suppression of Potential Oscillations in PEFCs by Using Anode Catalyst Prepared by Polygonal Barrel‐Sputtering Method

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