An antioxidant polybenzimidazole with naphthalene group for high-temperature proton exchange membrane fuel cells

Ju, Qing; Chao, Ge; Wang, Yixin; Lv, Zixin; Geng, Kang; Li, Nanwen

doi:10.1016/j.memsci.2023.121970

Cited by 13 publications

(3 citation statements)

References 38 publications

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“…25 Figure 3B exhibits the weight variation of the membranes immersed in Fenton reagent at 68 °C for 120 h. The pristine membrane and folded and stretched membranes respectively presented the residual weight percentages of 40.1, 35.7, and 43.9%. According to the images (Figure S3), (K/PA/S) 3 , (K/ PA/S) 3 -f, and (K/PA/S) 3 -50 membranes kept structural integrity without visible cracks at 68 °C for 72 h. However, some crinkles were observed, with the test lasting 120 h. Li and co-workers prepared the N-PBI membrane with a residual weight percentage of 40.1% in Fenton reagent at 80 °C for 120 h. 31 Zhao and co-workers reported a facile strategy to reinforce the oxidative stability by introducing free radical scavengers. 38 The external force exerted a negligible effect on the chemical stability of the folded and stretched membranes as expected.…”

Section: Durabilitymentioning

confidence: 99%

“…PA molecules as the most important anhydrous proton conduction carriers have been intensively researched in high-temperature PEMs. , Typically, for PA-doped PBI membranes, PA molecules are first bound to PBI molecular chains and then more PA molecules are combined through hydrogen bonding among PA molecules . On the basis of it, we perform this study of introducing PA molecules with two modes, including the spin coating process and the immersion process.…”

Section: Introductionmentioning

confidence: 99%

“…29,30 Typically, for PA-doped PBI membranes, PA molecules are first bound to PBI molecular chains and then more PA molecules are combined through hydrogen bonding among PA molecules. 31 On the basis of it, we perform this study of introducing PA molecules with two modes, including the spin coating process and the immersion process. Specifically, inner PA molecules are stably bound to Kevlar nanofibers with the formation of intermolecular hydrogen bonds between PA molecules and amino groups.…”

Section: Introductionmentioning

confidence: 99%

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Construction of Successive Proton Conduction Channels to Accelerate the Proton Conduction Process in Flexible Proton Exchange Membranes

Li,

Song,

Gao

et al. 2024

ACS Appl. Mater. Interfaces

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Successive proton conduction channels are constructed with the spin coating method in flexible proton exchange membranes (PEMs). In this research, phosphoric acid (PA) molecules are immobilized in the multilayered microstructure of Kevlar nanofibers and polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SEBS) polymer molecular chains. As a result, successive proton conduction channels can accelerate the proton conduction process in the prepared membrane with the multilayered microstructure. Additionally, the microstructure fractures of the composite membranes from the external force of folding and stretching operations are modified by the inner PA molecules. Notably, numerous PA molecules are further combined through formed intermolecular hydrogen bonding. The stretched membrane absorbs more PA molecules owing to the arrangement of PA molecules, Kevlar nanofibers, and SEBS molecular chains. The stretched membrane thus exhibits the enhanced proton conduction ability, such as the through-plane proton conductivity of 1.81 × 10–1 S cm–1 at 160 °C and that of 4.53 × 10–2 S cm–1 at 120 °C lasting for 600 h. Furthermore, the tensile stress of PA-doped stretched membranes reaches (3.91 ± 0.40)–(6.15 ± 0.43) MPa. A single proton exchange membrane fuel cell exhibits a peak power density of 483.3 mW cm–2 at 120 °C.

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Section: Durabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Construction of Successive Proton Conduction Channels to Accelerate the Proton Conduction Process in Flexible Proton Exchange Membranes

Li,

Song,

Gao

et al. 2024

ACS Appl. Mater. Interfaces

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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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Enhancing comprehensive performance of cross-linked PBI-based high-temperature proton exchange membranes: effectively doping a tetraphosphoric acid proton conductor

Zhi,

Lv,

Sun

et al. 2023

J Mater Sci

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An antioxidant polybenzimidazole with naphthalene group for high-temperature proton exchange membrane fuel cells

Cited by 13 publications

References 38 publications

Construction of Successive Proton Conduction Channels to Accelerate the Proton Conduction Process in Flexible Proton Exchange Membranes

Construction of Successive Proton Conduction Channels to Accelerate the Proton Conduction Process in Flexible Proton Exchange Membranes

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

Enhancing comprehensive performance of cross-linked PBI-based high-temperature proton exchange membranes: effectively doping a tetraphosphoric acid proton conductor

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