Direct ethylene glycol fuel-cell stack—Study of oxidation intermediate products

Лившиц, В. А.; Philosoph, M.; Peled, E.

doi:10.1016/j.jpowsour.2007.07.054

Cited by 93 publications

(40 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, C 2 H 6 O 2 is significantly less toxic than methanol [24] and is widely available and cheap compared to other fuels, which is a very important issue in the development of low-cost FCs. Furthermore, the complete oxidation of C 2 H 6 O 2 delivers 10 e -, i.e., more than CH 3 OH (6e -) and it has been reported by Peled´s group that the theoretical capacity of EG is higher than that of methanol (4.8 vs. 4 Ah/mL, respectively) [23]. The same group has successfully worked on the development of high power density DEGFCs [25][26][27][28].…”

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Synthesis and Evaluation of Highly Tolerant Pd Electrocatalysts as Cathodes in Direct Ethylene Glycol Fuel Cells (DEGFC)

Rodríguez-Varela¹,

Luna²,

Savadogo

2009

Energies

View full text Add to dashboard Cite

Abstract:Highly selective Pd electrocatalysts were synthesized by the formic acid (FA) method and evaluated as cathodes for DEGFC applications. In rotating disc measurements in acid medium, the Pd/C cathode showed important catalytic activity for the Oxygen Reduction Reaction (ORR). In the presence of ethylene glycol (EG, C 2 H 6 O 2 ), Pd/C exhibited a noteworthy electrochemical behavior and full tolerance to the organic molecule. No current density peaks associated to the EG oxidation reaction emerged and the shift in onset potential for the ORR (E onset ) toward more negative potentials was negligible on this cathode. As a comparison, commercial Pt/C was tested under the same conditions showing a poor selectivity for the ORR when EG was present. The detrimental effect of EG on the Pt electrocatalysts resulted in high intensity current density peaks due to the oxidation of EG and a significant shift in E onset . The evaluation of Pd/C in a DEGFC operating at 80 °C demonstrated its good performance as cathode material. Given these results, it is expected that highly efficient Pd-based cathodes can find application in DEGFCs.

show abstract

Section: Introductionmentioning

confidence: 95%

“…EG has high solubility in aqueous solutions [21,22] and is safer to handle as a fuel for FC applications than methanol [23]. Moreover, C 2 H 6 O 2 is significantly less toxic than methanol [24] and is widely available and cheap compared to other fuels, which is a very important issue in the development of low-cost FCs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Evaluation of Highly Tolerant Pd Electrocatalysts as Cathodes in Direct Ethylene Glycol Fuel Cells (DEGFC)

Rodríguez-Varela¹,

Luna²,

Savadogo

2009

Energies

View full text Add to dashboard Cite

show abstract

Section: 4-9mentioning

confidence: 99%

“…[18][19][20][21][22][23][24] The adsorbed CO and oxidation by-products block the Pt active sites, which results in a performance loss for both ORR and HOR.…”

Section: 4-9mentioning

confidence: 99%

“…The electrochemical oxidation of EG on the Pt/C catalyst in acid media has attracted interest because of its potential application as a fuel for direct alcohol fuel cells. [17][18][19][20][21][22][23][24][25] In addition to the complete oxidation product CO 2 , the electro-oxidation of EG produces numerous stable, adsorbed species and partly oxidized by-products such as adsorbed CO, glycolic acid, oxalic acid, glycolaldehyde, glyoxal, glyoxylic acid, formaldehyde, and formic acid. [18][19][20][21][22][23][24] The adsorbed CO and oxidation by-products block the Pt active sites, which results in a performance loss for both ORR and HOR.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Effects of Ethylene Glycol and Caprolactam on the ORR and HOR Performances of Pt/C Catalysts

Zhai

St‐Pierre

2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

Ethylene glycol (EG) and caprolactam are two representative contaminant species either present in the fuel cell system or released by fuel cell system materials. The contamination effects of EG and caprolactam on the electro-catalytic performances of a Pt/C catalyst toward the oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR) were investigated in acid media using the rotating ring/disk electrode (RRDE) technique. The Pt surface coverage increased with EG and caprolactam concentrations. The H 2 O 2 yield also significantly increased because of the effects of the two contaminants. The EG-and caprolactam-derived adsorbates reduce the ORR and HOR rates and modify the rate-determining step (change in Tafel Considering the inevitable depletion of conventional fossil fuels and the release of greenhouse gases into the Earth's atmosphere, it is necessary to look for renewable and clean energy supplies. Proton exchange membrane fuel cells (PEMFCs) are promising as clean energy sources for future automotive applications. However, the performance and durability of PEMFCs can be significantly decreased by the presence of contaminants in air and hydrogen or released by fuel cell system materials.1-3 Such species may adsorb on the Pt catalyst, penetrate into the ionomer and membrane, or compete with the main reactions, which decreases the active surface area, ionic conductivity of the catalyst layer and membrane, and cell performance. 2,4-9In addition, H 2 O 2 , which is a side product of the oxygen reduction reaction (ORR), and its associated yield often increases in the presence of organic contaminants such as acetylene, acetonitrile, propene, naphthalene, and methyl methacrylate. 10-13 A larger H 2 O 2 generation rate exerts an undetermined effect on the performance and durability of PEMFCs. The formation of H 2 O 2 has been linked to the radical attack decomposition of the Nafion ionomer, which is accelerated by the presence of Fe 2+ and Cu 2+ ions. 14,15 The Nafion ionomer is used as an electrolyte membrane and added to the catalyst layer to exploit its binding property and improve catalyst utilization. Consequently, the decomposition of the Nafion ionomer is a significant risk to the PEMFC performance and durability. Therefore, it is necessary to investigate the ORR, hydrogen oxidation reaction (HOR), and H 2 O 2 yield in the presence of contaminants to understand their effects on PEMFCs.This study was initiated with a list of system contaminants identified by the National Renewable Energy Laboratory (NREL).16 These were separated into 2 classes: linear and more structurally complex molecules including cyclic molecules (ring-shaped). One molecule of each class was chosen for these initial studies. Ethylene glycol (EG) is interesting because it is widely used as a coolant, antifreeze agent, and de-icing solution. De-icing of airport runways and airplanes is the primary source of EG in the environment. EG is also dispersed in the environment by the disposal of products that contain it. In addition, 1,6...

show abstract

Coproduction of Hydrogen and Chemicals by Electrochemical Reforming of Biomass‐Derived Alcohols

Miller

Vizza

Fornasiero

2017

Nanotechnology in Catalysis

View full text Add to dashboard Cite

Direct ethylene glycol fuel-cell stack—Study of oxidation intermediate products

Cited by 93 publications

References 21 publications

Synthesis and Evaluation of Highly Tolerant Pd Electrocatalysts as Cathodes in Direct Ethylene Glycol Fuel Cells (DEGFC)

Synthesis and Evaluation of Highly Tolerant Pd Electrocatalysts as Cathodes in Direct Ethylene Glycol Fuel Cells (DEGFC)

Effects of Ethylene Glycol and Caprolactam on the ORR and HOR Performances of Pt/C Catalysts

Coproduction of Hydrogen and Chemicals by Electrochemical Reforming of Biomass‐Derived Alcohols

Contact Info

Product

Resources

About