Composite membranes consisting of acidic carboxyl-containing polyimide and basic polybenzimidazole for high-temperature proton exchange membrane fuel cells

Qu, Erli; Geng, Changran; Xiao, Min; Han, Dongmei; Huang, Sheng; Huang, Zhiheng; Liu, Wei; Wang, Shuanjin; Ye, Meng

doi:10.1039/d2ta08904a

Cited by 20 publications

(6 citation statements)

References 57 publications

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Section: Resultsmentioning

confidence: 99%

“…These results underscore the role of a high density of helical channels in elevating the PA doping rate and making a substantial contribution to the efficient transportation of protons. [27] Under the condition that the temperature is <100 °C, protons can be transferred through the carrier or jumping mechanisms. [14b] At 80°C, the proton conductivity of the PA/1.8TCPP-BrPy-OPBI membrane is 0.071 S cm −1 , which is 1.9 times higher than that of the PA/Py-OPBI membrane, where the proton conductivity is 0.037 S cm −1 .…”

Section: Proton Conductivitymentioning

confidence: 99%

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Porphyrin Helical Nanochannel‐Assembled Polybenzimidazole Membranes Doped with Phosphoric Acid for Fuel Cells Operating in a Temperature Range of 25–200 °C

Xu,

Wang,

Guo

et al. 2023

Adv Funct Materials

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High‐temperature proton‐exchange membrane fuel cells (HT‐PEMFCs) fabricated with phosphoric acid (PA)‐doped polybenzimidazole (PBI) show apparent technical advantages. In practical automotive applications, achieving cold start‐up capability is crucial. In this work, a kind of branched block proton exchange membrane (PEM) based on PBI with a low content of porphyrin ring (<1 mol.%) is reported as a branched monomer. Self‐assembly into high‐density helical nanochannels under the synergistic effect of phase separation and porphyrin π−π stacking, thus the PEM can maintain a high level of PA doping. Specifically, the PA/1.8TCPP‐BrPy‐OPBI membrane shows a proton conductivity of 0.169 and 0.071 S cm−1, as well as an H2‐O2 fuel cell peak power density of 1077 and 357 mW cm−2 at 180 and 80 °C without humidification and backpressure, respectively. The membrane electrode assembly (MEA) can exhibit good fuel cell stability, with a voltage decay rate of only 7.0 µV h−1 at 80 °C. Furthermore, it maintains a peak power density of 93% even after 150 start‐up/shut‐down cycles at 25 °C. This work expands the operating temperature range of conventional PBI membranes between 25 and 200 °C and thus provides a novel strategy for high‐performance PBI‐based HT‐PEMFCs.

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Section: Resultsmentioning

confidence: 99%

Section: Proton Conductivitymentioning

confidence: 99%

Porphyrin Helical Nanochannel‐Assembled Polybenzimidazole Membranes Doped with Phosphoric Acid for Fuel Cells Operating in a Temperature Range of 25–200 °C

Xu,

Wang,

Guo

et al. 2023

Adv Funct Materials

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“…A novel acid−base composite membrane consisting of acidic carboxyl-containing polyimide (PI-COOH) and OPBI was recently developed by Meng et al 122 They also looked into the effects of the incorporation of this high-molecular-weight acidic polymer (PI-COOH) on the structure and properties of the composite membrane (Figure 9b). It was noticed that OPBI and PI-COOH formed a continuous hydrogen bonding network, allowing for a high proton conductivity (89 mS•cm −1 ), which is superior to that of the OPBI membrane (49 mS•cm −1 ).…”

Section: Pbi-based Composite Membranesmentioning

confidence: 99%

Perspectives on Membrane Development for High Temperature Proton Exchange Membrane Fuel Cells

Ying,

Liu,

Wang

et al. 2024

Energy Fuels

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High temperature proton exchange membrane fuel cells (HT-PEMFCs) are a promising energy conversion technology due to their quick reaction kinetics, high tolerance to CO impurities, and ease of heat and water management. Nevertheless, the practical implementation of this technology is limited since traditional proton exchange membranes (PEMs) exhibit significantly reduced performance at high temperatures and low humidity. In this extreme situation, researchers have concentrated on investigating new membranes through the creation of novel polymers and fillers or by suggesting sophisticated modification processes, with the goal of attaining high proton conductivity, stable mechanical properties, and tremendous temperature tolerance. This Review focuses on the latest advancements in four PEM domains: (1) perfluorosulfonic acid (PFSA)-based PEMs; (2) aromatic polymerbased PEMs; (3) polybenzimidazole (PBI)-based PEMs; and (4) polymer of intrinsic microporosity (PIM)-based PEMs. We describe and provide an overview of the preparation methods, mechanistic analysis, and core characteristics (proton conductivity and peak power density) of the aforementioned membrane materials. Furthermore, prospective research paths and challenges in the development of PEMs toward practical applications are also suggested.

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“…Another widely used type of PEMs is phosphoric acid (PA)‐doped polybenzimidazole (PBI) membranes. The polybenzimidazole backbone of PBI membranes not only offers mechanical support and better mechanical properties but also serves as an adsorption site for PA, ensuring its absorption 17–19 . These membranes are primarily utilized in high‐temperature fuel cells, compensating for the limitations of PFSA membranes by enabling operation in a higher temperature range (120–200°C) 20–23 .…”

Section: Introductionmentioning

confidence: 99%

“…The polybenzimidazole backbone of PBI membranes not only offers mechanical support and better mechanical properties but also serves as an adsorption site for PA, ensuring its absorption. [17][18][19] These membranes are primarily utilized in high-temperature fuel cells, compensating for the limitations of PFSA membranes by enabling operation in a higher temperature range (120-200 C). [20][21][22][23] However, PBI suffers from issues such as poor solubility, limited molecular design at the molecular level, PA migration and loss, and the challenge of balancing the amount of PA doping with mechanical properties.…”

mentioning

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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Composite membranes consisting of acidic carboxyl-containing polyimide and basic polybenzimidazole for high-temperature proton exchange membrane fuel cells

Abstract: A novel acid-base composite membrane consisting of acidic carboxyl containing polyimide (PI-COOH) and basic polybenzimidazole (OPBI) is fabricated and employed as high-temperature proton exchange membranes (HT-PEMs). PI-COOH is devoted to...

Cited by 20 publications

References 57 publications

Porphyrin Helical Nanochannel‐Assembled Polybenzimidazole Membranes Doped with Phosphoric Acid for Fuel Cells Operating in a Temperature Range of 25–200 °C

Porphyrin Helical Nanochannel‐Assembled Polybenzimidazole Membranes Doped with Phosphoric Acid for Fuel Cells Operating in a Temperature Range of 25–200 °C

Perspectives on Membrane Development for High Temperature Proton Exchange Membrane Fuel Cells

All‐carbon backbone aromatic polymers for proton exchange membranes

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