Galvanostatic and Volumetric Studies of Hydrocarbons Adsorbed on Fuel Cell Anodes

Niedrach, L. W.

doi:10.1149/1.2425994

Cited by 60 publications

(40 citation statements)

References 18 publications

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“…Thus, the reductive current visible during adsorption at low potentials very likely originates from the hydrogenation of ethene to ethane. The presence of the signal at higher potentials could be a result of self-hydrogenation of ethene, which has been described previously in the literature [13], in which ethene adspecies donate hydrogen to ethene in an outer layer, forming ethane that exits via the outlet. The remaining adspecies is then in a higher oxidation state than non-adsorbed ethene.…”

Section: Adsorptionsupporting

confidence: 57%

The influence of ethene impurities in the gas feed of a PEM fuel cell

Kortsdottir

Lindström

Lindbergh

2013

International Journal of Hydrogen Energy

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Section: Adsorptionsupporting

confidence: 57%

The influence of ethene impurities in the gas feed of a PEM fuel cell

Kortsdottir

Lindström

Lindbergh

2013

International Journal of Hydrogen Energy

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“…The occurrence of the self-hydrogenation reaction is clear from results reported both in gas phase (37) and in electrochemical systems (6,10). For the latter, however, the process competes with that of reaction [3] which is potential dependent.…”

mentioning

confidence: 57%

Kinetics and Mechanism of Adsorbed Ethylene Electrooxidation on Platinized Platinum under Potentiodynamic Conditions

Triaca

Rabockai

Arvía

1979

J. Electrochem. Soc.

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The potentiodynamic electrooxidation of the~ adsorbed ethylene species on platinized platinum is studied at 40 , 60 , and 80 C in 1N H~SO4 saturated with ethylene at 1 atm pressure. The perturbation conditions are chosen to avoid the influence of ethylene readsorption. Experimental conditions to obtain the maximum coverage by the adsorbed species are established. The electrosorption process at the potential of maximum adsorption is related to a transient anodic current assigned to the electrooxidation of hydrogen adatoms. The kinetic parameters reveal that the electrochemical reaction is an activated process. Its interpretation and discussion are based on two possible schemes which are different than those earlier proposed for the ethylene electrooxidation under stationary conditions. The initial step in any of them is rate determining and corresponds either to the deprotonation of the adsorbed radical or to the water molecule discharge on the completely covered electrode surface.The electrochemical oxidation of ethylene on platinum has been studied rather extensively in the last 20 years mainly as a promising reaction for fuel cells. Two kinds of contributions can be roughly distinguished: first, the works principally based on quasistationary electrochemical measurements to derive a comprehensive kinetic analysis of the hydrocarbon over-all electrooxidation process (1-5); and second, those studies attempting to identify the number and type of adsorbed species and to elucidate their adsorption characteristics (6-13). Reviews of all these works have been published (14-21).A critical analysis of the available information immediately shows that different and to some extent contradictory conclusions are reported principally related to the number and kind of adsorbed species formed, the type of process related to the ethylene adsorption on platinum, the characteristics of the ethylene electrodesorption, and the coexistence of hydrogen adatoms at the adsorption potential. The difficulties in determining definitive answers to these questions arise to a large extent from different reported results which are sometimes not straightforwardly comparable either because they were obtained with electrochemical interfaces of different composition at different temperatures and under a wide range of perturbation conditions of the pertaining electrochemical parameters or the interference of the electroformation of the oxygen-containing layer on the metal was not adequately evaluated. Unless the amount of charge of the latter is clearly established, the charge related to the adsorbed hydrocarhon eleetrooxidation remains uncertain. It should be noted that the complex behavior of the oxygen-containing layer electrochemically formed on platinum in the absence of the hydrocarbon should influence the response of the electrocatalyst in the presence of the hydrocarbon. In this respect the electrocatalytic properties of the metal should also depend on the variables controlling the electrochemical interface. Then, it is reasonable to expect ...

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“…In HT-PEMFC the anode potential does not exceed 50 mV (even at high current densities of 1.5 A cm −2 ) which is far below the minimum potential suggested for methane adsorption. Niedrach [54] found that methane had low adsorption on platinum (0.28 at STP) compared to that of other saturated hydrocarbons (moderate) except ethane, while unsaturated hydrocarbons exhibited very high adsorption: 0.79 (at STP) for propylene and 0.91 (at STP) for cyclopropane. This suggests that consideration should be taken for nonsaturated hydrocarbons in the reformate gas, and their concentration should be determined.…”

Section: Phosphoric Acid Concentration Temperature and Watermentioning

confidence: 99%

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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Galvanostatic and Volumetric Studies of Hydrocarbons Adsorbed on Fuel Cell Anodes

Cited by 60 publications

References 18 publications

The influence of ethene impurities in the gas feed of a PEM fuel cell

The influence of ethene impurities in the gas feed of a PEM fuel cell

Kinetics and Mechanism of Adsorbed Ethylene Electrooxidation on Platinized Platinum under Potentiodynamic Conditions

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

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