Assessment of the performance of a PEMFC in the presence of CO

Jiménez, Santiago Leguey; Soler, J.; Valenzuela, Rita X.; Daza, L.

doi:10.1016/j.jpowsour.2005.02.049

Cited by 94 publications

(40 citation statements)

References 15 publications

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“…The observed performance recovery is likely due to the gradual desorption of the adsorbed CO molecules from the PtRu/C active sites. The following mechanism has been suggested for the re-activation of the CO-poisoned sites [1][2][3][4] …”

Section: Methodsmentioning

confidence: 99%

“…However, even traces (ppm) of carbon monoxide (CO) in the hydrogen feed gas can cause serious performance degradation of PEMFCs [1][2][3][4][5][6]. In order to achieve higher power output with CO containing feed in fuel cells, the utilisation of bimetallic anode catalysts, PtM/C, have been largely investigated [1][2][3][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The CO poisoning and recovery processes on the anode are strongly influenced by the kinetics and thermodynamics of either direct or electrochemical oxidation of CO, as well as the physical and chemical adsorption/desorption processes. In addition, because of the strong poisoning of the anode catalyst with CO at lower temperatures, it is important to investigate the fuel cell performance at room temperature relating to the start-up conditions of the PEM fuel cell system [2,4]. Potential oscillations have been previously reported by other groups [2,4,[10][11][12], but our goal was to obtain further insight into the CO poisoning process and into the resulting dynamic characteristics of a cell using CO-containing H 2 as anode feed.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, because of the strong poisoning of the anode catalyst with CO at lower temperatures, it is important to investigate the fuel cell performance at room temperature relating to the start-up conditions of the PEM fuel cell system [2,4]. Potential oscillations have been previously reported by other groups [2,4,[10][11][12], but our goal was to obtain further insight into the CO poisoning process and into the resulting dynamic characteristics of a cell using CO-containing H 2 as anode feed. In fact, the transient recovery of the cell performance is likely related to the fast electrochemical oxidation of the adsorbed CO occurring above certain anode overpotential.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Behavior of a PEM Fuel Cell During Electrochemical CO Oxidation on a PtRu Anode

et al. 2008

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The dynamic behaviour of a single PEM fuel cell (PEMFC) with a PtRu/C anode catalyst using CO containing H 2 as anode feed was investigated at ambient temperature. The autonomous oscillations of the cell potential were observed during the galvanostatic operation with hydrogen anode feed containing CO up to 1000 ppm. The oscillations were ascribed to the coupling of the adsorption of CO (the poisoning step) and the subsequent electrochemical oxidation of CO (the regeneration step) on the anode catalyst. The oscillations were dependent on the CO concentration of the feed gas and the applied current density. Furthermore, it was found that with CO containing feed gas, the time average power output was remarkably higher under potential oscillatory conditions in the galvanostatic mode than during potentiostatic operation. Accompanying these self-sustained potential oscillations, oscillation patterns of the anode outlet CO concentration were also detected at low current density (\100 mA/cm 2 ). The online measurements of the anode outlet CO concentrations revealed that CO in the anode CO/H 2 feed was partially electrochemically removed during galvanostatic operation. More than 90% CO conversion was obtained at the current densities above 125 mA/cm 2 with low feed flow rates (100-200 mL/min).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic Behavior of a PEM Fuel Cell During Electrochemical CO Oxidation on a PtRu Anode

et al. 2008

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“…The main electrochemical reactions involve hydrogen and oxygen and in the absence of additional "side" reactions the net product is simply water. However, the main intended sources of hydrogen (H 2 ) are reformed hydrocarbons [2], which contain traces of ammonia, hydrogen sulfide and carbon monoxide. Each of these compounds engender reactions that seriously degrade performance and can potentially cause long-term harm to the positive electrode [3][4][5].…”

Section: Introductionmentioning

confidence: 99%