A review of electrocatalysts with enhanced CO tolerance and stability for polymer electrolyte membarane fuel cells

Ehteshami, Seyyed Mohsen Mousavi; Chan, Siew Hwa

doi:10.1016/j.electacta.2013.01.086

Cited by 149 publications

(66 citation statements)

References 102 publications

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“…This indicates that the mechanism of oxidation of CO of PtMo/C is different than for PtRu/C. Usually for PtRu/C, the CO oxidation proceeds through the bifunctional mechanism [24], where the formation of surface oxides species take place on the Ru sites and the oxidation of adsorbed CO take place on the Pt sites by these oxides species, as shown below:…”

Section: Resultsmentioning

confidence: 98%

Effect of Addition of Ru and/or Fe in the Stability of PtMo/C Electrocatalysts in Proton Exchange Membrane Fuel Cells

2015

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In this work, the activity, stability, and CO tolerance of ternary and quaternary electrocatalysts formed by PtMo/C-PtFe/C, PtMo/C-PtRu/C, and PtMo/C-PtRuCPtFe/C were studied in the anodes of proton exchange membrane fuel cells (PEMFCs). Cyclic voltammetry (CV) was used to study the surface characteristics and stability of the electrocatalysts and polarization curves were used to investigate the performance of PEMFC anodes supplied with pure hydrogen and hydrogen containing 100 ppm CO. Online mass spectrometry (OLMS) and CO stripping experiments were conducted to investigate the CO tolerance mechanism.

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Section: Resultsmentioning

confidence: 98%

Effect of Addition of Ru and/or Fe in the Stability of PtMo/C Electrocatalysts in Proton Exchange Membrane Fuel Cells

2015

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“…[2][3][4][5] Strategies inspired by the use of as econd metal in Pt-based anode catalysts have been explored as potential routes to increaset he CO tolerance relative to pure Pt. [2,[5][6][7][8][9][10][11][12] Within the possibilities of bimetallic electrocatalysts, Pt-Ru shows great activity for H 2 oxidation in the presence of CO and it is the most successful alloy characterized to date. [11] An interesting aspect of these devices is that the reactions that occur on the surface of these catalysts and the adsorption/desorptionp rocesses are interrelated through the anode potential, and this delicate interplay can result in oscillatory behavior.…”

Section: Introductionmentioning

confidence: 99%

Voltage Oscillations in a Polymer Electrolyte Membrane Fuel Cell with Pd‐Pt/C and Pd/C Anodes

Nogueira

Varela

2017

ChemistryOpen

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Polymer electrolyte membrane fuel cells (PEMFC) fed with H2 contaminated with CO may exhibit oscillatory behavior when operated galvanostatically. The self‐organization of the anodic overpotential is interesting because it can be accompanied by an increase in the average performance. Herein we report experimental studies of voltage oscillations that emerge in a PEMFC equipped with a Pd/C or PdPt/C anode and fed with H2 contaminated with CO (100 ppm). We used on‐line mass spectrometry to investigate how the mass fragments associated with CO2 and CO (m/z 44 and 28, respectively) varied with the voltage oscillations. Overall, we observed that oscillations in the anodic overpotential are in phase with that of the CO and CO2 signals. This fact is consistent with an autonomous adsorption–oxidation cyclic process. For both anodes, it has been observed that, in general, an increase in current density implies an increase in oscillatory frequency. By using CO stripping, we also discuss how the onset of CO oxidation is related to the maximum overpotential reached during a cycle, whereas the minimum overpotential can be associated with the catalytic activity of the electrode for H2 oxidation.

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“…Occupying platinum covered catalyst surface by carbon monoxide is referred to as poisoning phenomenon. One of the greatest obstacles in commercialization of PEMFCs is the high cost of the electrocatalysts and their susceptibility to impurities, especially CO [4].…”

Section: Introductionmentioning

confidence: 99%

Poisoning phenomenon and oxygen bleeding in dead-ended polymer electrolyte membrane fuel cells: A computational study using OpenFOAM ®

Hafttananian

Ramiar

Ranjbar

2016

International Journal of Hydrogen Energy

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A review of electrocatalysts with enhanced CO tolerance and stability for polymer electrolyte membarane fuel cells

Cited by 149 publications

References 102 publications

Effect of Addition of Ru and/or Fe in the Stability of PtMo/C Electrocatalysts in Proton Exchange Membrane Fuel Cells

Effect of Addition of Ru and/or Fe in the Stability of PtMo/C Electrocatalysts in Proton Exchange Membrane Fuel Cells

Voltage Oscillations in a Polymer Electrolyte Membrane Fuel Cell with Pd‐Pt/C and Pd/C Anodes

Poisoning phenomenon and oxygen bleeding in dead-ended polymer electrolyte membrane fuel cells: A computational study using OpenFOAM ®

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