Novel VHT-PEFC MEAs Based on ABPBI Membranes for APU Applications

Wannek, C.; Dohle, H.; Mergel, Jürgen; Stolten, Detlef

doi:10.1149/1.2921530

Cited by 16 publications

(6 citation statements)

References 11 publications

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“…As expected, fuel cell results are quite satisfactory and are in agreement with other reports in the literature for this type of system, [18][19][20][21][22]33,65 with a maximum power density of approx. 175 mW cm −2 at 150-170 • C. This demonstrates the suitability of the developed ABPBI membranes.…”

Section: Resultssupporting

confidence: 92%

Poly(2,5-bibenzimidazole) Membranes: Physico-Chemical Characterization Focused on Fuel Cell Applications

Linares

Sanches

Paganin

et al. 2012

J. Electrochem. Soc.

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Membranes of Poly(2,5-benzimidazole) (ABPBI), prepared by polycondensation in polyphosphoric acid, were characterized from the fuel cell application point of view: mechanical properties of the membranes for different acid doping levels, thermal stability, permeability for the different gases/vapors susceptible of use in the cell (hydrogen, oxygen, methanol and ethanol), electro-osmotic water drag coefficient, oxidation stability to hydroxyl radicals, phosphoric acid leaching rate and, finally, in-plane membrane conductivity. ABPBI membranes presented an excellent thermal stability, above 500 • C in oxygen, suitable mechanical properties for high phosphoric acid doping levels, a low methanol and ethanol limiting permeation currents, and oxygen permeability compared to Nafion membranes, and a low phosphoric acid leaching rate when exposed to water vapor. On the contrary, hydrogen permeation current was higher than that of Nafion, and the chemical stability was very limited. Membrane conductivity achieved 0.07 S cm −1 after equilibration with a humid environment. Fuel cell tests showed reasonable good performances, with a maximum power peak of 170 mW cm −2 for H 2 /air at 170 • C operating under a humidified hydrogen stream, 39.9 mW cm −2 for CH 3 OH/O 2 at 200 • C for a methanol/water weight ratio of 1:2, and 31.5 mW cm −2 for CH 3 CH 2 OH/O 2 at the same conditions than for methanol.

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Section: Resultssupporting

confidence: 92%

Poly(2,5-bibenzimidazole) Membranes: Physico-Chemical Characterization Focused on Fuel Cell Applications

Linares

Sanches

Paganin

et al. 2012

J. Electrochem. Soc.

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“…2). ABPBI has been studied by Litt et al, 61 Akita et al, 62 by our group, [63][64][65] Kim et al, 55, 66 Krishnan et al, 67 J.-H. Lee et al, 68,69 J.-C. Lee et al, 70,71 Wannek et al, 72,73 Corti et al 74,75 and Bozkurt, 76 doped with PA. All have found that ABPBI absorbs much more acid than PBI when treated with identical phosphoric acid solutions. Furthermore, ABPBI membranes have the same performance as PBI under the same conditions 60 and can be produced easily and more safely from a single cheap monomer.…”

Section: Alternative Pem Polymers Of the Benzimidazole Familymentioning

confidence: 99%

Proton-conducting membranes based on benzimidazole polymers for high-temperature PEM fuel cells. A chemical quest

2010

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The development of high-temperature PEM fuel cells (working at 150-200 degrees C) is pursued worldwide in order to solve some of the problems of current cells based on Nafion (CO tolerance, improved kinetics, water management, etc.). Polybenzimidazole membranes nanoimpregnated with phosphoric acid have been studied as electrolytes in PEMFCs for more than a decade. Commercially available polybenzimidazole (PBI) has been the most extensively studied and used for this application in membranes doped with all sorts of strong inorganic acids. In addition to this well-known polymer we also review here studies on ABPBI and other polybenzimidazole type membranes. More recently, several copolymers and related derivatives have attracted many researchers' attention, adding variety to the field. Furthermore, besides phosphoric acid, many other strong inorganic acids, as well as alkaline electrolytes have been used to impregnate benzimidazole membranes and are analyzed here. Finally, we also review different hybrid materials based on polybenzimidazoles and several inorganic proton conductors such as heteropoly acids, as well as sulfonated derivatives of the polymers, all of which contribute to a quickly-developing field with many blooming results and useful potential which are the subject of this critical review (317 references).

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“…Xia et al (Xia, Zhang et al 2018) and Zhang et al pointed out that higher temperature would bring better cell performance in HT-PEMFC. Wannek et al (Wannek, Dohle et al 2008) reported that increasing the temperature from 140 °C to 200 °C can decrease the membrane resistance and improve the current density. Ong et al (Ong, Jung et al 2010) reported that their fuel cell could acquire the best performance at 170 °C, while Parrondo et al (Parrondo, Venkateswara Rao et al 2011) stated the 180 °C would be a better choice.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of vapor behavior in high temperature PEM fuel cell under key material and operating parameters

Xia

Zhang

Chen

et al. 2021

International Journal of Green Energy

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The water issue of high temperature proton exchange membrane fuel cell (HT-PEMFC) is rarely studied in the previous work. However, the different water vapor behaviors might greatly influence both cell performance and stability. In order to gain a fundamental understanding of the vapor behaviors in HT-PEMFC, a 3D computational fluid dynamics model and a 2D transient model were developed to investigate the effects of materials properties and operating parameters on the vapor behavior. Temperature, membrane materials and phosphoric acid doping degrees are examined. The results shows that higher temperature and phosphoric acid doping degrees with PBI membrane would lead to a significant increase of water vapor generation at cathode. For the transient model, the dynamics of vapor accumulation were observed with the dead-end anode. It is revealed that vapor transport and distribution get adapted to a dynamic equilibrium after 18 s. According to these results, a periodic purging at anode with optimized purging time is still needed to remove the accumulated water vapor. The findings of this paper can be further applied in the design of fuel cell controller.

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Novel VHT-PEFC MEAs Based on ABPBI Membranes for APU Applications

Cited by 16 publications

References 11 publications

Poly(2,5-bibenzimidazole) Membranes: Physico-Chemical Characterization Focused on Fuel Cell Applications

Poly(2,5-bibenzimidazole) Membranes: Physico-Chemical Characterization Focused on Fuel Cell Applications

Proton-conducting membranes based on benzimidazole polymers for high-temperature PEM fuel cells. A chemical quest

Numerical study of vapor behavior in high temperature PEM fuel cell under key material and operating parameters

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