| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Madeira, Lm
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2023Fe-containing carbon-coated monoliths prepared by CVD in gaseous toluene abatement-parametric analysis of the Fenton processcitations
- 2022Gaseous toluene abatement by the heterogeneous Fenton-like process using iron/carbon-coated monolith as catalyst: Proof of conceptcitations
- 2022Unravelling the relation between processed crude oils and the composition of spent caustic effluents as well as the respective economic impactcitations
- 2019Low temperature glycerol steam reforming over a Rh-based catalyst combined with oxidative regenerationcitations
- 2016Chemical and photochemical degradation of polybrominated diphenyl ethers in liquid systems - A reviewcitations
- 2014Azo-dye orange II degradation by the heterogeneous Fenton-like process using a zeolite Y-Fe catalyst-Kinetics with a model based on the Fermi's equationcitations
- 2014Removal of paraquat pesticide with Fenton reaction in a pilot scale water systemcitations
- 2014Boehmite-phenolic resin carbon molecular sieve membranes-Permeation and adsorption studiescitations
- 2013Influence of the iron precursor in the preparation of heterogeneous Fe/activated carbon Fenton-like catalystscitations
- 2013Drinking water and biofilm disinfection by Fenton-like reactioncitations
- 2010Enhancing the production of hydrogen via water-gas shift reaction using Pd-based membrane reactorscitations
- 2007Azo-dye Orange II degradation by heterogeneous Fenton-like reaction using carbon-Fe catalystscitations
- 2005Proton electrolyte membrane properties and direct methanol fuel cell performance II. Fuel cell performance and membrane properties effectscitations
- 2005Performance and efficiency of a DMFC using non-fluorinated composite membranes operating at low/medium temperaturescitations
- 2002New evidences of redox mechanism in n-butane oxidative dehydrogenation over undoped and Cs-doped nickel molybdatescitations
Places of action
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article
Performance and efficiency of a DMFC using non-fluorinated composite membranes operating at low/medium temperatures
Abstract
In order to increase the chemical/thermal stability of the sulfonated poly(ether ether ketone) (sPEEK) polymer for direct methanol fuel cell 14 (DMFC) applications at medium temperatures (up to 130 degrees C), novel inorganic-organic composite membranes were prepared using sPEEK polymer as organic matrix (sulfonation degree, SD, of 42 and 68%) modified with zirconium phosphate (ZrPh) pretreated with n-propylamine and polybenzimidazole (PBI). The final compositions obtained were: 10.0 wt.% ZrPh and 5.6 wt.% PBI; 20.0 wt.% ZrPh and 11.2 wt.% PBI. These composite membranes were tested in DMFC at several temperatures by evaluating the current-voltage polarization curve, open circuit voltage (OCV) and constant voltage current (CV, 35 mV). The fuel cell ohmic resistance (null phase angle impedance, NPAI) and CO2 concentration in the cathode outlet were also measured. A method is also proposed to evaluate the fuel cell Faraday and global efficiency considering the CH3OH, CO2, H2O, O-2 and N-2 permeation through the proton exchange membrane (PEM) and parasitic oxidation of the crossover methanol in the cathode. In order to improve the analysis of the composite membrane properties, selected characterization results presented in [VS. Silva, B. Ruffmann, S. Vetter, A. Mendes, L.M. Madeira, S.P. Nunes, Catal. Today, in press] were also used in the present study. The unmodified sPEEK membrane with SD = 42% (S42) was used as the reference material. In the present study, the composite membrane prepared with sPEEK SD = 68% and inorganic composition of 20.0 wt.% ZrPh and 11.2 wt.% PBI proved to have a good relationship between proton conductivity, aqueous methanol swelling and permeability. DMFC tests results for this membrane showed similar current density output and higher open circuit voltage compared to that of sPEEK with SD = 42%, but with much lower CO2 concentration in the cathode outlet (thus higher global efficiency) and higher thermal/chemical stability. This membrane was also tested at 130 degrees C with pure oxygen (cathode inlet) and achieved a maximum power density of 50.1 mW cm(-2) at 250 mA cm(-2).