The Impact of Hydrogen Fuel Contaminates on Long-Term PMFC Performance

Garzón, Fernando H.; Uribe, Francisco A.; Rockward, Tommy; Urdampilleta, Idoia; Brosha, Eric L.

doi:10.1149/1.2356190

Cited by 47 publications

(36 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unfortunately, even traces of impurities can have detrimental effects on FC performance (1). For fuel impurities, extensive research has been done on CO poisoning, but much less attention has been given to the effects of H 2 S. We have reported that concentrations of H 2 S as low as 10 ppb (10/10 9 ) caused significant losses after 1000 hour of anode exposure (2). FC tolerance to H 2 S depends on several factors, such as impurity concentration, time of exposure and other operational conditions.…”

Section: Introductionmentioning

confidence: 99%

PEMFC Poisoning with H2S: Dependence on Operating Conditions

Urdampilleta¹,

Uribe²,

Rockward³

et al. 2007

ECS Trans.

Self Cite

View full text Add to dashboard Cite

H 2 S is a well known poison for polymer electrolyte fuel cells. In this work we have found that the severity of H 2 S poisoning depends on H 2 S concentration, dosage, cell temperature and anode humidification. We found catalyst poisoning by H 2 S was cumulative and highly irreversible. After poisoning, further cell operation on neat hydrogen resulted only in modest performance recovery. Full recovery could usually be attained after repetitive cyclic voltammetry between 0 and 1.4 V. We discuss improvements of cell tolerance to H 2 S and performance recovery using other strategies, such as holding the cell at open circuit and anode air bleed during operation. We discuss the possible implications of H 2 S crossover on cathode performance.

show abstract

Section: Introductionmentioning

confidence: 99%

PEMFC Poisoning with H2S: Dependence on Operating Conditions

Urdampilleta¹,

Uribe²,

Rockward³

et al. 2007

ECS Trans.

Self Cite

View full text Add to dashboard Cite

show abstract

“…3 and references therein, for example]. Past H 2 S studies indicate S-species as much stronger site blockers than CO because of a greater affinity for metals, with higher concentrations and longer exposure times capable of leading to irreversible poisoning [4,5,6]. Most recently, we have reported that H 2 S concentrations as low as to ppb, produced negative effects on fuel cell performance [4J.…”

Section: Iatroduetiodmentioning

confidence: 99%

Development of Analytical Techniques to Study H2S Poisoning of PEMFCs and Components

et al. 2009

Self Cite

View full text Add to dashboard Cite

Polymer electrolyte membrane fuel cells are sensitive to impurities. H2S at the ppb level will impact fuel cell performance. It is important to quantify H2S adsorption and issues such as permeation and crossover rates become extremely important. Experimental methods have been developed to quantify H2S adsorption onto surfaces and to quantify H2S permeation through Nafion® using common and inexpensive Ag/AgS ion-probes. In addition to calculating the H2S uptake on commonly used XC-72 and Pt/XC-72 materials, the H2S permeability through dry and humidified Nafion® membranes was also studied using specialized techniques. A sulfide anti-oxidant buffer solution was used to trap and concentrate trace quantities of H2S during the course of the measurement. Crossover experiments were conducted for up to 24 hours in order to achieve sulfide ion concentrations high enough to be precisely determined by subsequent titration. We have confirmed H2S crossover in Nafion® membranes and have calculated preliminary rates of crossover.

show abstract

“…Nafion properties depend on various impurities in the system. For example, it was shown in [ 6 ] that additions of H 2 S of about 10 ppb to pure hydrogen resulted in a significant decrease in the proton conductivity through a polymer membrane in a hydrogen fuel cell, i.e., to a decrease in the fuel cell efficiency.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Polymer Membrane Swelling in Aqueous Suspension of Amino-Acids with Different Isotopic Composition; Photoluminescence Spectroscopy Experiments

et al. 2021

View full text Add to dashboard Cite

In photoluminescence spectroscopy experiments, the interaction mode of the polymer membrane Nafion with various amino-acids was studied. The experiments were performed with physiological NaCl solutions prepared in an ordinary water (the deuterium content is 157 ± 1 ppm) and also in deuterium-depleted water (the deuterium content is ≤1 ppm). These studies were motivated by the fact that when Nafion swells in ordinary water, the polymer fibers are effectively “unwound” into the liquid bulk, while in the case of deuterium-depleted water, the unwinding effect is missing. In addition, polymer fibers, unwound into the liquid bulk, are similar to the extracellular matrix (glycocalyx) on the cell membrane surface. It is of interest to clarify the role of unwound fibers in the interaction of amino-acids with the polymer membrane surface. It turned out that the interaction of amino-acids with the membrane surface gives rise to the effects of quenching luminescence from the luminescence centers. We first observed various dynamic regimes arising upon swelling the Nafion membrane in amino-acid suspension with various isotopic content, including triggering effects, which is similar to the processes in the logical gates of computers.

show abstract

The Impact of Hydrogen Fuel Contaminates on Long-Term PMFC Performance

Cited by 47 publications

References 7 publications

PEMFC Poisoning with H2S: Dependence on Operating Conditions

PEMFC Poisoning with H2S: Dependence on Operating Conditions

Development of Analytical Techniques to Study H2S Poisoning of PEMFCs and Components

Dynamics of Polymer Membrane Swelling in Aqueous Suspension of Amino-Acids with Different Isotopic Composition; Photoluminescence Spectroscopy Experiments

Contact Info

Product

Resources

About