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Vermeijlen, Jjtt Jac.; Janssen, Ljj Jos; Visser, GJ

doi:10.1023/a:1018434325530

Cited by 29 publications

(31 citation statements)

References 8 publications

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“…The exchange current density obeys a power law of C H 2 ð1Þ with exponent near 0.72: the values obtained with a reduced number of data is in acceptable agreement with the theoretical value of 0.5 deduced from the oxidation mechanism, and the reaction order reported by [14] at 0.42.…”

Section: Resultssupporting

confidence: 84%

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Investigation of the response of separate electrodes in a polymer electrolyte membrane fuel cell without reference electrode

et al. 2006

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The paper presents electrochemical measurements carried out in a PEMFC with a view to determining the separate kinetics of the electrode reactions. For this purpose, the separate response of one electrode (anode or cathode) was magnified by dilution of the reacting gas, respectively hydrogen and oxygen, and comparison of the experimental data in the form of steady voltage-current variations and impedance spectra. Experiments were carried out at 60°C and ambient pressure. Water management was thoroughly controlled so that the gases leaving the cell had the same relative humidity in all experiments of one series. Hydrogen oxidation, although rapid, corresponds to overpotentials up to 50 mV at high dilution rates and current densities. Assuming a Tafel-Volmer mechanism, the exchange current density of the anode reaction at the Pt surface is of the order of 1 mA cm )2 . The two techniques employed led to Tafel slopes of oxygen reduction ranging from 120 to 150 mV/decade, with an exchange current density near 1 lA cm )2 , in good agreement with published data. AbbreviationsFaraday's constant, 96487 C mol )1 I current, A i current density, A m )2 or A cm )2 i L limiting current density, A m )2 or A cm )2 i 0 exchange current density, A m )2 or A cm )2 J specific flux mol m )2 s )1 m partitioning coefficient n number of electrons involved P pressure, Atm Q pseudocapacitance, S cm )2 s a R gas constant, 8.314 J K )1 mol )1 r specific resistance, W cm 2Greek letters a exponent of constant phase element a charge transfer coefficient c ration of effective area over geometrical area d layer thickness, m e porosity g overpotential, V ¥ bulk conditions

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Section: Resultssupporting

confidence: 84%

“…Tafel slopes for hydrogen oxidation and evolution, b T;H 2 and b T;H þ respectively, were taken at RT/(2F) as in Tafel-Volmer mechanism, which has been considered in previous investigations [14,15]. This corresponds to 33 mV/decade at 60°C.…”

Section: Theoretical Lawsmentioning

confidence: 99%

Investigation of the response of separate electrodes in a polymer electrolyte membrane fuel cell without reference electrode

et al. 2006

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“…Except for the CO 2 containing gas mixture, which was observed to have specific behaviour, the charge transfer resistance of hydrogen oxidation varies with the hydrogen content to the power 0.6. Reference [11] found a slope of 0.42 for the logarithmic dependence of exchange current density with the hydrogen concentration. Both values were in good agreement, as the value of 0.6 was estimated from five points with a poor confidence degree.…”

Section: Hydrogen Dilutionmentioning

confidence: 99%

Effect of Gas Dilution on PEM Fuel Cell Performance and Impedance Response

et al. 2006

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In this work, an experimental study of gas dilution on the performance of a polymer electrolyte membrane (PEM) fuel cell was carried out. Impedance spectra were analysed depending on the dilution of either hydrogen or oxygen by nitrogen. By comparison of the impedance spectra obtained, the three loops were attributed to hydrogen oxidation, oxygen reduction and a low frequency diffusion process. Hydrogen oxidation was shown to be more complicated when the anode side was fed by a simulated reforming gas than with the same dilution rate with nitrogen.

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“…Many fundamental studies have been performed to determine the mechanism of hydrogen oxidation on platinum [2][3][4][5][6][7][8]. Some investigations [2][3][4][5] used rotating platinum discs and others [6][7][8] used gas diffusion electrodes, loaded with a small quantity of highly dispersed platinum (typically 0.50 mg cm -2 ).…”

Section: Hydrogen Platinum Anodementioning

confidence: 99%

“…Some investigations [2][3][4][5] used rotating platinum discs and others [6][7][8] used gas diffusion electrodes, loaded with a small quantity of highly dispersed platinum (typically 0.50 mg cm -2 ).…”

Section: Hydrogen Platinum Anodementioning

confidence: 99%

Hydrogen fuel cells for cars and buses

Janssen

2007

J Appl Electrochem

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The use of hydrogen fuel cells for cars is strongly promoted by the governments of many countries and by international organizations like the European Community. The electrochemical behaviour of the most promising fuel cell (polymer electrolyte membrane fuel cell, PEMFC) is critically discussed, based on results presented in the literature. Moreover, when some non-electrochemical aspects are taken into consideration, it is concluded that the prospects are not too bright. Moreover, the hydrogen-rich gas generated from small organics contains CO 2 and a small amount of CO, its use easily leads to poisoning of the platinum gas diffusion anode in the fuel cell. Also the hydrogen storage problems are still not solved.

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Cited by 29 publications

References 8 publications

Investigation of the response of separate electrodes in a polymer electrolyte membrane fuel cell without reference electrode

Investigation of the response of separate electrodes in a polymer electrolyte membrane fuel cell without reference electrode

Effect of Gas Dilution on PEM Fuel Cell Performance and Impedance Response

Hydrogen fuel cells for cars and buses

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