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

Lü, Hui; Rihko‐Struckmann, Liisa; Hanke‐Rauschenbach, Richard; Sundmacher, Kai

doi:10.1007/s11244-008-9117-9

Cited by 37 publications

(42 citation statements)

References 22 publications

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“…Experiments under comparable conditions for a similar system but un-der potentiostatic control result in nonoscillatory responses and further evidences the performance decrease due to the presence of carbon monoxide in the anodic feed. 32 The dynamics was investigated by means of a time series of the anodic overpotential registered at different cell currents ͑ j͒. The experiments were repeated for different anode flow rates, as summarized in the flow rate vs current diagram in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Complex Oscillatory Response of a PEM Fuel Cell Fed with H[sub 2]/CO and Oxygen

Mota-Lima

Lopes

Ticianelli

et al. 2010

J. Electrochem. Soc.

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Oscillatory kinetics is commonly observed in the electrocatalytic oxidation of most species that can be used in fuel cell devices. Examples include formic acid, methanol, ethanol, ethylene glycol, and hydrogen/carbon monoxide mixtures, and most papers refer to half-cell experiments. We report in this paper the experimental investigation of the oscillatory dynamics in a proton exchange membrane ͑PEM͒ fuel cell at 30°C. The system consists of a Pt/C cathode fed with oxygen and a PtRu ͑1:1͒/C anode fed with H 2 mixed with 100 ppm of CO, and was studied at different cell currents and anode flow rates. Many different states including periodic and nonperiodic series were observed as a function of the cell current and the H 2 /CO flow rate. In general, aperiodic/ chaotic states were favored at high currents and low flow rates. The dynamics was further characterized in terms of the relationship between the oscillation amplitude and the subsequent time required for the anode to get poisoned by carbon monoxide. Results are discussed in terms of the mechanistic aspects of the carbon monoxide adsorption and oxidation.

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Section: Resultsmentioning

confidence: 99%

“…3d͒ is described by strong relaxation oscillations similar to those previously reported. 28,32 Period-2 oscillations are observed at intermediate currents ͑Fig. 3c͒ and are characterized by the presence of intercalated large ͑L͒ and small ͑S͒ oscillation amplitudes.…”

Section: Resultsmentioning

confidence: 99%

Complex Oscillatory Response of a PEM Fuel Cell Fed with H[sub 2]/CO and Oxygen

Mota-Lima

Lopes

Ticianelli

et al. 2010

J. Electrochem. Soc.

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“…22,25 The commercial catalysts were purchased from Johnson-Matthey. The graphite bipolar plates have parallel flow fields with channels of 2 mm width and 2 mm depth, with 1 mm wide ribs between them.…”

Section: Methodsmentioning

confidence: 99%

“…This dynamic process can be recycled and self-sustained. 19,22,25 Meanwhile, the oscillatory voltage also indicates the selfsustained efforts of the fuel cell to recover the poisoned active sites of the anode catalyst for maintaining given current densities. Fig.…”

Section: Cell Voltage Oscillationsmentioning

confidence: 99%

Spontaneous oscillations of cell voltage, power density, and anode exit CO concentration in a PEM fuel cell

Lü¹,

Rihko‐Struckmann²,

Sundmacher³

2011

Phys. Chem. Chem. Phys.

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The spontaneous oscillations of the cell voltage and output power density of a PEMFC (with PtRu/C anode) using CO-containing H 2 streams as anodic fuels have been observed during galvanostatic operating. It is ascribed to the dynamic coupling of the CO adsorption (poisoning) and the electrochemical CO oxidation (reactivating) processes in the anode chamber of the single PEMFC. Accompanying the cell voltage and power density oscillations, the discrete CO concentration oscillations at the anode outlet of the PEMFC were also detected, which directly confirms the electrochemical CO oxidation taking place in the anode chamber during galvanostatic operating.

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“…In subsequent papers (Lu et al 2008, 2009, HankeRauschenbach et al 2009 ), the behavior of a cascade of two ECPrOx reactors was investigated. The authors studied two different electrical confi gurations.…”

Section: Technical Applicationsmentioning

confidence: 99%

Nonlinear dynamics of fuel cells: a review

Hanke‐Rauschenbach

Mangold

Sundmacher³

2011

Reviews in Chemical Engineering

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Over the last decade, nonlinear phenomena in low-temperature fuel cells as well as high-temperature fuel cells have been reported in the open literature. Experimental and theoretical studies found multiple steady states as well as periodic oscillations. The present article gives an overview of publications on this subject. Instead of sorting the analyses according to the types of fuel cells, this work used the source of the nonlinearity for classifi cation. In the fi rst part of the contribution, a very simple prototype fuel cell model is introduced. The model helps to give a qualitative explanation of the majority of nonlinear effects reported in literature. It is further used to identify potential sources of nonlinear behavior in reaction kinetics, membrane properties, and mass transport mechanisms. A classifi cation scheme that is based on types of negative differential resistance (NDR) and was originally introduced by K. Krischer in Modern Aspects of Electrochemistry (Vol. 32, p. 1, Plenum Press, 1999) for electrochemical systems is applied to fuel cells. The second part of the work classifi es the fi ndings from literature according to their NDR type. Instabilities resulting not from electrochemistry but from other mechanisms such as water formation and reactant starvation are also discussed.

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

Cited by 37 publications

References 22 publications

Complex Oscillatory Response of a PEM Fuel Cell Fed with H[sub 2]/CO and Oxygen

Complex Oscillatory Response of a PEM Fuel Cell Fed with H[sub 2]/CO and Oxygen

Spontaneous oscillations of cell voltage, power density, and anode exit CO concentration in a PEM fuel cell

Nonlinear dynamics of fuel cells: a review

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