500h Continuous aging life test on PBI/H3PO4 high-temperature PEMFC

Hu, Jingwei; Zhang, Huamin; Zhai, Yunfeng; Liu, Gang; Yi, Baolian

doi:10.1016/j.ijhydene.2006.05.001

Cited by 95 publications

(53 citation statements)

References 15 publications

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“…In addition to agglomeration of the Pt catalyst associated with the dissolution and re-deposition of Pt particles induced by high temperatures and current loadings [40,41] and carbon corrosion [42], acid in the electrode catalyst layer also induce grain growth and agglomeration of Pt catalysts in the case of the PA/PBI based membrane cell. This is supported by the observed significant agglomeration of Pt nanoparticles particualry in the cathode layer ( Fig.8 and Table 2), which is partially responsible for the performance degradation of the PA/PBI membrane fuel cell at high temperature [43]. Liu et al revealed that extra PA in the electrodes resulted in the drastic degradation in performance and reduced stability of PA/PBI membrane fuel cells [44].…”

Section: Role Of Pwa-meso-silica In the Composite Membranementioning

confidence: 77%

In Situ Formed Phosphoric Acid/Phosphosilicate Nanoclusters in the Exceptional Enhancement of Durability of Polybenzimidazole Membrane Fuel Cells at Elevated High Temperatures

Zhang

Aili

Bradley

et al. 2017

J. Electrochem. Soc.

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Section: Role Of Pwa-meso-silica In the Composite Membranementioning

confidence: 77%

In Situ Formed Phosphoric Acid/Phosphosilicate Nanoclusters in the Exceptional Enhancement of Durability of Polybenzimidazole Membrane Fuel Cells at Elevated High Temperatures

Zhang

Aili

Bradley

et al. 2017

J. Electrochem. Soc.

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“…This can be accomplished either by impregnating the PTFE bonded electrodes with an ionomer or using the ionomer as the binder. For PBI cells, the used ionomers include PBI [227][228][229][230] or PBI-polyvinylidene difluoride (PVDF) [231] blend with subsequent acid doping, sulphonated polymer, e.g. Nafion [232] which in combination with phosphoric acid has proton conductivity at higher temperatures [233,234], or other polymers [235] that are containing functional groups for incorporating phosphoric acid.…”

Section: Catalysts Gas Diffusion Electrodes and Membrane-electrode Amentioning

confidence: 99%

“…A mixture of Pt/C and PBI solution in NMP has been used for spraying and tape-casting [229,230]. For the purpose of tape-casting [224], a stiff gas diffusion layer (GDL) material was used with a supporting layer of PTFE bonded carbon black to smooth the surface.…”

Section: Catalysts Gas Diffusion Electrodes and Membrane-electrode Amentioning

confidence: 99%

High temperature proton exchange membranes based on polybenzimidazoles for fuel cells

Jensen

Savinell

et al. 2009

Progress in Polymer Science

1,209

851

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. To achieve high temperature operation of proton exchange membrane fuel cells (PEMFC), preferably under ambient pressure, acid-base polymer membranes represent an effective approach. The phosphoric acid-doped polybenzimidazole membrane seems so far the most successful system in the field. It has in recent years motivated extensive research activities with great progress. This treatise is devoted to updating the development, covering polymer synthesis, membrane casting, physicochemical characterizations and fuel cell technologies. To optimize the membrane properties, high molecular weight polymers with synthetically modified or N-substituted structures have been synthesized. Techniques for membrane casting from organic solutions and directly from acid solutions have been developed. Ionic and covalent cross-linking as well as inorganic-organic composites has been explored. Membrane characterizations have been made including spectroscopy, water uptake and acid doping, thermal and oxidative stability, conductivity, electro-osmotic water drag, methanol crossover, solubility and permeability of gases, and oxygen reduction kinetics. Related fuel cell technologies such as electrode and MEA fabrication have been developed and high temperature PEMFC has been successfully demonstrated at temperatures of up to 200• C under ambient pressure. No gas humidification is mandatory, which enables the elimination of the complicated humidification system, compared with Nafion cells. Other operating features of the PBI cell include easy control of air flow rate, cell temperature and cooling. The PBI cell operating at above 150• C can tolerate up to 1% CO and 10 ppm SO 2 in the fuel stream, allowing for simplification of the fuel processing system and possible integration of the fuel cell stack with fuel processing units. Long-term durability with a degradation rate of 5 V h −1 has been achieved under continuous operation with hydrogen and air at 150-160• C. With load or thermal cycling, a performance loss of 300 V per cycle or 40 V h −1 per operating hour was observed. Further improvement should be done by, e.g. optimizing the thermal and chemical stability of the polymer, acid-base interaction and acid management, activity and stability of catalyst and more importantly the catalyst support, as well as the integral interface between electrode and membrane.

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“…Several EIS studies on PA-PBI based high temperature PEM fuel cells emerged from 2006 [68][69][70][71][72]. Jalani and his co-workers [68] published their impedance analysis of a single cell assembly, named Celtec ® -P series 1000 MEA (BASF Fuel Cell).…”

Section: Impedance Studymentioning

confidence: 99%

“…However, both groups did not perform EC simulations of the cell impedance. At the same time, a more completed EIS application was published by Jingwei Hu and his co-workers [22,[69][70][71], which included a series work of impedance measurement and analysis, EC simulations, and degradation tests of cell performance.…”

Section: Impedance Studymentioning

confidence: 99%