Temperature dependence of the Tafel slope for oxygen reduction on platinum in concentrated phosphoric acid

Clouser, S. J.; Huang, Jianzhi; Yeager, Ernest

doi:10.1007/bf00721951

Cited by 133 publications

(82 citation statements)

References 11 publications

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“…A change in the transfer coefficient (increase) with temperature was obtained using a nonlinear, least squares fitting method [33]. This result agrees with the finding of others [23] and similar documented behaviour in PAFC [26,28,29,34].…”

Section: Introductionsupporting

confidence: 80%

“…Values for c, the rate change of alpha with temperature, were 0.0014 [28], 0.0015 [47], 0.0034 [34], and 0.0043 [23] (PBI 16 PRU).…”

Section: Phosphoric Acid Concentration Temperature and Watermentioning

confidence: 99%

“…A summary of a and b constants for (28) is in given Table 3: a = a 1 X 4 − a 2 X 3 + a 3 X 2 − a 4 X + a 0 ,…”

Section: Appendixmentioning

confidence: 99%

“…Various Tafel slopes have been reported for phosphoric acid fuel cells in the range of 90 and 135 mV dec −1 (α = 0.93− 0.62) at 150 • C [26][27][28][29][30][31][32]. An average value of alpha equal to 0.75 (112 mV dec −1 ) was considered in this work.…”

Section: Phosphoric Acid Concentration Temperature and Watermentioning

confidence: 99%

“…As shown elsewhere [23], values of transfer coefficient changed with doping level. For example, at 150 • C, the lowest Tafel slope observed at the minimum doping level of 4.5 PRU (4.5 mole per repeat PBI unit) was 92 mV dec −1 (α = 0.91) which increased to 104 mV dec −1 (α = 0.81) at a doping level of 10 PRU [24,25] and to 90-135 mV dec −1 (α = 0.93-0.62) for phosphoric acid fuel cells [26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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A High Temperature Polymer Electrolyte Membrane Fuel Cell Model for Reformate Gas

Mamlouk

Sousa

Scott

2011

International Journal of Electrochemistry

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A one-dimensional model of a high temperature polymer electrolyte membrane fuel cell using polybenzimidazole (PBI) membranes is described. The model considers mass transport through a thin film electrolyte covering the catalyst particles as well as through the porous media. The incorporation of a thin film model describing reactant gas mass transport through electrolyte covering the electrocatalyst is shown to be an essential requirement for accurate simulation. The catalyst interface is represented using a macrohomogeneous model. The influence of carbon monoxide, carbon dioxide, and methane, which would be present in a reformate gas, is considered in terms of the effect on the anode polarisation/kinetics behaviour. The model simulates the influence of operating conditions, cell parameters, and fuel gas compositions on the cell voltage current density characteristics. The model gives good predictions of the effect of oxygen and air pressures on cell behaviour and correctly simulates the mass transport behaviour of the cell. The model with reformate gas shows that additional voltage losses associated with CO poisoning can lead to loss in voltage of tens of mV and thus reduction in power.

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