HT-PEMs based on carbazole grafted polybenzimidazole with high proton conductivity and excellent tolerance of phosphoric acid

Cui, Yinghe; Wang, Shuang; Wang, Di; Li, Geng; Li, Fengxiang; Liang, Deqing; Wang, Xiaodong; Yong, Zhipeng; Wang, Zhe

doi:10.1016/j.memsci.2021.119610

Cited by 46 publications

(19 citation statements)

References 43 publications

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“…This may be because the incorporation of PA destroys the hydrogen bonds in the polymer chains. 11 As illustrated in Figure 6b, the elongation at break of the membranes increased from 13.4−21.1 to 26.1−31.3% after PA doping owing to the plasticization of PA. 11 Although the mechanical properties of the membranes decreased after PA doping, they were comparable with that of other PEMs under similar conditions, 48,49 and the obtained PEMs with PA doping show good perspectives for HT-PEMFCs application.…”

Section: ■ Results and Discussionmentioning

confidence: 87%

Poly(fluorenyl terphenyl piperidinium) with Sulfonated Side Chains for the Application of High-Temperature Proton Exchange Membranes

Chen

et al. 2023

ACS Appl. Energy Mater.

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To produce proton exchange membranes (PEMs) with robust mechanical properties, poly(fluorenyl terphenyl piperidinium) (PFTP) with an aromatic backbone is synthesized. Sulfonated PFTP (SPFTP-x) is obtained by introducing propanesulfonic acid onto PFTP as a side chain to enhance its phosphoric acid (PA) adsorption capacity and proton conductivity. Both the PFTP and SPFTP-x membranes exhibit good thermal, oxidization, and dimensional stabilities owing to their rigid ether-free aromatic backbones. Because of the introduction of propanesulfonic acid side chains, the SPFTP-x membranes show higher PA adsorption capacity and higher proton conductivity than the PFTP membrane. The PA doping content of the SPFTP-x membranes is more than 160% at room temperature, and their conductivity can be up to 109.0 mS cm–1 at 160 °C under anhydrous condition. Furthermore, a single cell assembled with SPFTP-50 exhibits a maximum power density of 280 mW cm–2 at 100 °C. These results indicate that SPFTP-x is a promising membrane material for applications in high-temperature proton exchange membrane fuel cells.

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Section: ■ Results and Discussionmentioning

confidence: 87%

Poly(fluorenyl terphenyl piperidinium) with Sulfonated Side Chains for the Application of High-Temperature Proton Exchange Membranes

Chen

et al. 2023

ACS Appl. Energy Mater.

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“…In addition, PBI can provide effective proton receptors and donors, which help protons jumping. At present, the PA/PBI membrane is the sole HT‐PEM, which meets the requirements by US Department of Energy 14 . HT‐PEMFCs offer the possibility to further utilize the exhaust heat for a cogeneration system.…”

Section: Introductionmentioning

confidence: 99%

“…At present, the PA/PBI membrane is the sole HT-PEM, which meets the requirements by US Department of Energy. 14 HT-PEMFCs offer the possibility to further utilize the exhaust heat for a cogeneration system. So far, a variety of thermodynamic cycles were proposed to integrate with the HT-PEMFC, such as the thermally regenerative electrochemical cycle, 15 three-heat-source absorption cycle, 16 Kalina cycle, 17 organic Rankine cycle, 9 and so on.…”

mentioning

confidence: 99%

A novel triple‐cycle system based on high‐temperature proton exchange membrane fuel cell, thermoelectric generator, and thermally regenerative electrochemical refrigerator for power and cooling cogeneration

Guo

Zhang

Guo

et al. 2022

Intl J of Energy Research

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Summary To effectively utilize the exhaust heat of high‐temperature proton exchange membrane fuel cells (HT‐PEMFCs) for cooling, a novel triple‐cycle system model mainly including a HT‐PEMFC, thermoelectric generator (TEG), and thermally regenerative electrochemical refrigerator (TRER) is theoretically formulated. The TEG activated by the HT‐PEMFC exhaust heat is used to drive the TRER for cooling. Considering irreversible losses in the HT‐PEMFC, TEG, and TRER and among these subsystems, mathematical formulas of the energetic and exergetic performance indexes are obtained. Calculation results show that compared with a sole HT‐PEMFC system, the equivalent power density, energetic efficiency, and exergetic efficiency for the triple‐cycle system increase by 16.0%, 12.6%, and 12.7%, respectively. The exergy destruction rate density reduces by 1.0%. Finally, sensitivity analysis of seven key parameters is conducted. This study can provide a valuable guide for the design of actual triple‐cycle systems based on HT‐PEMFCs for power and cooling cogeneration.

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“…Among the most studied examples are sulfonated poly(arylene ether ketone)s, 11,12 sulfonated poly(arylene ether sulfone)s, 13,14 sulfonated poly(phenylene)s, 15,16 or sulfonated polybenzimidazole. 17,18 However, many PEMs composed of sulfonated hydrocarbon-based polymers typically require a high ion exchange capacity (IEC) to realize proton conductivity comparable to that of PFSA membranes, which results in significantly reduced dimensional stability. 19 The synthesis of branched sulfonated copolymers for PEMs is considered an effective way to improve proton conductivity without sacrificing dimensional stability.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, several kinds of sulfonated hydrocarbon-based polymers have been studied as alternatives to PFSA polymers, owing to a series of advantages that include low fuel permeation, remarkable thermal stability, excellent mechanical properties, and low costs. Among the most studied examples are sulfonated poly(arylene ether ketone)s, , sulfonated poly(arylene ether sulfone)s, , sulfonated poly(phenylene)s, , or sulfonated polybenzimidazole. , However, many PEMs composed of sulfonated hydrocarbon-based polymers typically require a high ion exchange capacity (IEC) to realize proton conductivity comparable to that of PFSA membranes, which results in significantly reduced dimensional stability. , …”

Section: Introductionmentioning

confidence: 99%

Highly Branched Poly(arylene ether ketone sulfone)s Bearing Flexible Sulfoalkyl Side Chains for Proton Exchange Membranes

Xie

Liu

Ringuette

et al. 2022

ACS Appl. Energy Mater.

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The crucial impact of the elevated degree of branching (DB) on improving the properties of proton exchange membranes (PEMs) has been demonstrated, yet PEMs (employing the B 3 monomer as the branching agent) with DB values exceeding 10% have not been reported. Herein, we report on the synthesis of a series of highly branched sulfonated poly(arylene ether ketone sulfone) copolymers bearing a 12.5% DB value for PEMs, namely, B-12.5-SPAEKS-x (where x represents the molar ratio of the monomer attaching the sulfoalkyl chain to the employed bisfluoride monomers). To accomplish this, a triphenol derivative was designed as the branching agent to reduce the possibility of macroscopic cross-linking during polymerization, and the flexible sulfoalkyl side chains were grafted to the polymer backbone to enhance the chain entanglement of the copolymers. Among all of the fabricated membranes, the B-12.5-SPAEKS-graft-40 membrane exhibited comparable proton conductivity (118.6 mS cm −1 ) and swelling change (20.7%) with those of Nafion 117 in a fully hydrated state at 80 °C, realizing the trade-off between the proton conductivity and dimensional stability. Furthermore, the proton conductivity of the B-12.5-SPAEKS-graft-50 membrane was evidently superior to that of Nafion 117 in both the fully hydrated state and high relative humidity conditions; therefore, a higher maximum power density of 529.5 mW cm −2 was achieved in the H 2 /air fuel cell.

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HT-PEMs based on carbazole grafted polybenzimidazole with high proton conductivity and excellent tolerance of phosphoric acid

Cited by 46 publications

References 43 publications

Poly(fluorenyl terphenyl piperidinium) with Sulfonated Side Chains for the Application of High-Temperature Proton Exchange Membranes

Poly(fluorenyl terphenyl piperidinium) with Sulfonated Side Chains for the Application of High-Temperature Proton Exchange Membranes

A novel triple‐cycle system based on high‐temperature proton exchange membrane fuel cell, thermoelectric generator, and thermally regenerative electrochemical refrigerator for power and cooling cogeneration

Highly Branched Poly(arylene ether ketone sulfone)s Bearing Flexible Sulfoalkyl Side Chains for Proton Exchange Membranes

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