Performance and stability of ether-free high temperature proton exchange membranes with tunable pendent imidazolium groups

Ju, Qing; Tang, Hongying; Chen, Ge; Guo, Tiegen; Geng, Kang; Li, Nanwen

doi:10.1039/d2ta07129k

Cited by 26 publications

(7 citation statements)

References 58 publications

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“…[ 5 ] Most importantly, the PAF‐6‐PA/OPBI composite membranes demonstrated a better trade‐off between mechanical strength and proton conductivity than many other reported PA‐PBI membranes. [ 23,28–32 ]…”

Section: Resultsmentioning

confidence: 99%

“…It is worth noting that the loading of catalyst Pt in the cell performance tests was 0.3 mg cm −2 , which was much lower than that of current commercial PBI (1 mg cm −2 ) and other reported work. [23,[28][29][30][31][32] The cost advantage of PAF-6-PA/OPBI will provide a new idea for the commercial application of composite HT-PEMs due to the high cost of precious metal Pt catalysts. In order to demonstrate the excellent comprehensive performance of the composite membranes, the comparison of several performances based on PA-PBI membranes is summarized in Table S1 (Supporting Information).…”

Section: Characterization and Performance Of Composite Membranesmentioning

confidence: 99%

“…[5] Most importantly, the PAF-6-PA/OPBI composite membranes demonstrated a better trade-off between mechanical strength and proton conductivity than many other reported PA-PBI membranes. [23,[28][29][30][31][32] To further investigate the proton conduction mechanism in PAF-6-PA/OPBI composite membranes, the Arrhenius plots and proton transfer activation energy values (E a ) have been calculated according to the Arrhenius equation (Equation S5), as shown in Figure 3b, indicating that protons are transferred via the Grotthuss mechanism at high temperatures range of 100-200 °C. [33] As expected, the E a for pristine OPBI and composite membranes ranged from 14 to 20 kJ mol −1 .…”

Section: Characterization and Performance Of Composite Membranesmentioning

confidence: 99%

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PAF‐6 Doped with Phosphoric Acid through Alkaline Nitrogen Atoms Boosting High‐Temperature Proton‐Exchange Membranes for High Performance of Fuel Cells

Wang

et al. 2023

Advanced Materials

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High‐temperature proton‐exchange‐membrane fuel cells (HT‐PEMFCs) can offer improved energy efficiency and tolerance to fuel/air impurities. The high expense of the high‐temperature proton‐exchange membranes (HT‐PEMs) and their low durability at high temperature still impede their further practical applications. In this work, a phosphoric acid (PA)‐doped porous aromatic framework (PAF‐6‐PA) is incorporated into poly[2,2′‐(p‐oxydiphenylene)‐5,5′‐benzimidazole] (OPBI) to fabricate novel PAF‐6‐PA/OPBI composite HT‐PEMs through solution‐casting. The alkaline nitrogen structure in PAF‐6 can be protonated with PA to provide proton hopping sites, and its porous structure can enhance the PA retention in the membranes, thus creating fast pathways for proton transfer. The hydrogen bond interaction between the rigid PAF‐6 and OPBI can also enhance the mechanical properties and chemical stability of the composite membranes. Consequently, PAF‐6‐PA/OPBI exhibits an optimal proton conductivity of 0.089 S cm−1 at 200 °C, and peak power density of 437.7 mW cm−2 (Pt: 0.3 mg cm−2), which is significantly higher than that of the OPBI. The PAF‐6‐PA/OPBI provides a novel strategy for the practical application of PBI‐based HT‐PEMs.

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Section: Resultsmentioning

confidence: 99%

Section: Characterization and Performance Of Composite Membranesmentioning

confidence: 99%

Section: Characterization and Performance Of Composite Membranesmentioning

confidence: 99%

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PAF‐6 Doped with Phosphoric Acid through Alkaline Nitrogen Atoms Boosting High‐Temperature Proton‐Exchange Membranes for High Performance of Fuel Cells

Wang

et al. 2023

Advanced Materials

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“…The doping temperature was controlled at 80 °C, and the duration was 6 h. The PA uptakes, ADLs, and swelling degrees of the membranes were measured in triplicate. The PA uptakes of the membranes were determined from the increment in the masses of membranes during PA doping: 33,34 PA uptake (%) = ( m 1 − m 0 )/ m 0 × 100%where m 0 and m 1 are the masses of the membrane before and after PA doping, respectively.…”

Section: Methodsmentioning

confidence: 99%

Alkyl-substituted poly(arylene piperidinium) membranes enhancing the performance of high-temperature polymer electrolyte membrane fuel cells

Li¹,

Yang²,

Zhang³

et al. 2023

J. Mater. Chem. A

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“…In 2022, Li et al synthesized poly(arylene‐alkane) with imidazole groups in the side chains (Table 2). 129 Strong imidazolium‐biphosphate ion–pair interaction increases the loading strength of phosphoric acid. As a result, PIBI‐Q70/PA membrane exhibited 20% higher PA retention than the mPBI/PA membrane at 80°C/40% RH.…”

Section: Poly(arylene‐alkane)smentioning

confidence: 99%

All‐carbon backbone aromatic polymers for proton exchange membranes

Li,

Chai,

Liu

et al. 2023

Journal of Polymer Science

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Proton exchange membranes (PEMs) play a crucial role in energy storage and conversion technologies such as fuel cells, redox flow batteries, and water electrolysis. Currently, perfluorosulfonic acid polymer (PFSA) membranes are the most commonly used PEM materials. However, PFSA membranes possess certain drawbacks, including the high dependence of proton conductivity on humidity, low glass transition temperatures, and complex synthesis processes. In recent decades, significant efforts have been dedicated to developing various alternative PEM materials, such as the sulfonated products of polyether ether ketone, poly(phenylene oxide), polysulfone, and polyimide. However, the backbones of these polymers often contain heteroatoms that are prone to breaking under practical working conditions, leading to reduced chemical stability. In contrast, all‐carbon backbone aromatic polymers exhibit excellent chemical stability, thermal stability, and mechanical properties, as well as high proton conductivity upon incorporating suitable acidic groups, which makes them promising alternatives for PEM materials. This review aims to summarize the recent research progress about all‐carbon backbone aromatic polymers, with a specific focus on synthesis strategies, structure–performance relationships, and applications in PEMs.

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Performance and stability of ether-free high temperature proton exchange membranes with tunable pendent imidazolium groups

Abstract: (Benz)imidazoliums are demonstrated to be effective for the retention of phosphoric acid (PA) in PA doped proton exchange membranes (PEMs) due to the formation of (benz)imidazolium-biphosphate ion-pairs. However, there is...

Cited by 26 publications

References 58 publications

PAF‐6 Doped with Phosphoric Acid through Alkaline Nitrogen Atoms Boosting High‐Temperature Proton‐Exchange Membranes for High Performance of Fuel Cells

PAF‐6 Doped with Phosphoric Acid through Alkaline Nitrogen Atoms Boosting High‐Temperature Proton‐Exchange Membranes for High Performance of Fuel Cells

Alkyl-substituted poly(arylene piperidinium) membranes enhancing the performance of high-temperature polymer electrolyte membrane fuel cells

All‐carbon backbone aromatic polymers for proton exchange membranes

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