Dimensionally-stable phosphoric acid–doped polybenzimidazoles for high-temperature proton exchange membrane fuel cells

Li, Xiaobai; Ma, Hongwei; Shen, Yanchao; Hu, Wei; Jiang, Zhenhua; Liu, Baijun; Guiver, Michael D.

doi:10.1016/j.jpowsour.2016.11.013

Cited by 82 publications

(43 citation statements)

References 51 publications

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“…As shown in Table 1, the use of Eaton´s reagent seems to be the only known route to polybenzimidazoles derived from larger dicarboxylic acids, particularly various arylene ethers (Table 1; Entry 14-18, 26, 41, 45, 47). 31,66,[75][76][77][78] As discussed above, electron rich dicarboxylic acid also seem to have higher reactivity in Eaton´s reagent than electron deficient dicarboxylic acids, which results in a higher degree of polymerization. 66 Like in the PPA system, microwave heating has been reported to shorten reaction times in Eaton´s reagent as well.…”

Section: Structural Scope From Homogeneous Solution Polymerizationmentioning

confidence: 99%

From polybenzimidazoles to polybenzimidazoliums and polybenzimidazolides

et al. 2020

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Section: Structural Scope From Homogeneous Solution Polymerizationmentioning

confidence: 99%

From polybenzimidazoles to polybenzimidazoliums and polybenzimidazolides

et al. 2020

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“…Eaton et al proposed PPMA as a convenient alternative to PPA solvent for the synthesis of various polymers. 25,41 The polymerization of AEDCA-based PyOPBI in PPMA was conducted and high-molecular-weight polymers with higher inherent viscosity are obtained (Table 1).…”

Section: Synthesis Of Aryl Ether Type Pyopbi Polymers Andmentioning

confidence: 99%

Pyridine-Bridged Polybenzimidazole for Use in High-Temperature PEM Fuel Cells

Harilal

Shukla

Ghosh

et al. 2021

ACS Appl. Energy Mater.

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Although pyridine bridged oxypolybenzimidazole (PyOPBI) membranes are considered to be promising hightemperature proton exchange membrane (HT-PEM) materials that have the potential to overcome many obstacles such as solubility, membrane processability, cost, etc., of the mainstream conventional polybenzimidazole (PBI)-based HT-PEM, the weak structural stability of PyOPBI in concentrated phosphoric acid (PA) and poor dimensional and mechanical stability have been the crucial issues restraining the performance. To mitigate these bottlenecks, in this work, we successfully synthesized three types of PyOPBIs with flexible aryl ether backbones and bulky substituents by polycondensation reaction of various aryl diacids and pyridine-bridged tetraamine 2,6-bis(3′,4′-diaminophenyl)-4-phenylpyridine (PyTAB) in Eaton's reagent followed by casting as HT-PEMs. Three designed bulky substitute containing PyOPBI membranes showed considerably high PA loading capacity (16−22 mol of PA/repeat unit) and proton conductivity (0.04−0.078 S/cm) at 180 °C as compared to earlier reported unsubstituted PyOPBI membranes (14 mol of PA/repeat unit and 0.007 S/cm at 180 °C). In addition, the obtained membranes showcased good chemical, mechanical, thermal, and long-term conductivity stabilities and outstanding stability in concentrated PA. The pendent groups and the bulkiness of the backbone are believed to be the cause behind better stability and facilitating proton transport that results in higher proton conductivity. The single cell made from the membrane electrode assembly of these bulky substituted PyOPBI membranes displayed a peak power density in the range of 144−240 mW cm −2 under H 2 /O 2 at 160 °C, which is considerably higher than that for unsubstituted PyOPBI membrane (90.4 mW cm −2 ). Overall, the current results provide an effective strategy to explore the benefits of structural modulation of PyOPBI using various structurally divergent diacids to enhance HT-PEM properties and suggest a scalable route for the advancement of PBI-based HT-PEM fuel cells.

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“…Materials of the perovskite-type mainly absorb inorganic fillers for PEMs at high temperatures due to their high thermal stability and suitable conductivity of the protons [153]. Perovskites with a wide range of chemical and physical properties have a chemical formula of ABO 3 where A (A cations are 12-coordinated by oxygen and have a large ionic radius of the same size as the oxygen ion) and B (B cations are 6-coordinated by oxygen and have a small ionic radius located in the octahedral holes between the closed AO layers) are the appropriate cations [125,154,155]. The stable structure of perovskite oxides is due to their balanced geometry and valence of the basic atoms.…”

Section: High-temperature Pems Based On Pbimentioning

confidence: 99%

A Review of Recent Developments and Advanced Applications of High-Temperature Polymer Electrolyte Membranes for PEM Fuel Cells

et al. 2021

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This review summarizes the current status, operating principles, and recent advances in high-temperature polymer electrolyte membranes (HT-PEMs), with a particular focus on the recent developments, technical challenges, and commercial prospects of the HT-PEM fuel cells. A detailed review of the most recent research activities has been covered by this work, with a major focus on the state-of-the-art concepts describing the proton conductivity and degradation mechanisms of HT-PEMs. In addition, the fuel cell performance and the lifetime of HT-PEM fuel cells as a function of operating conditions have been discussed. In addition, the review highlights the important outcomes found in the recent literature about the HT-PEM fuel cell. The main objectives of this review paper are as follows: (1) the latest development of the HT-PEMs, primarily based on polybenzimidazole membranes and (2) the latest development of the fuel cell performance and the lifetime of the HT-PEMs.

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Dimensionally-stable phosphoric acid–doped polybenzimidazoles for high-temperature proton exchange membrane fuel cells

Cited by 82 publications

References 51 publications

From polybenzimidazoles to polybenzimidazoliums and polybenzimidazolides

From polybenzimidazoles to polybenzimidazoliums and polybenzimidazolides

Pyridine-Bridged Polybenzimidazole for Use in High-Temperature PEM Fuel Cells

A Review of Recent Developments and Advanced Applications of High-Temperature Polymer Electrolyte Membranes for PEM Fuel Cells

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