Proton-conductive polymeric ionic liquids block copolymer of poly(vinylphosphonic acid)/1-propylimidazole-b-polystyrene for polymer electrolyte membrane fuel cells

Suzuki, Yukina; Nohara, Tomohiro; Tabata, Keisuke; Yamakado, Ryohei; Shimada, Ryuichiro; Nakazaki, Haruki; Saito, Takaaki; Makino, Tsutomu; Arita, Toshihiko; Masuhara, Akito

doi:10.35848/1347-4065/ac51c2

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…Previously, we successfully fabricated polymer electrolyte membranes (PEMs) with high proton conductivity by mixing functionalized nanofillers. Nanoparticle surfaces were precisely coated with polymers that were highly compatible with matrix materials via reversible addition–fragmentation chain transfer (RAFT) polymerization with particles (PwP). − Specifically, cellulose nanocrystals (CNCs), known for their high aspect ratio and strength, were used as the core nanoparticles. A copolymer of poly(vinylphosphonic acid) (PVPA) and polystyrene (PS) (PVPA- b -PS) was used as the shell polymer.…”

Section: Introductionmentioning

confidence: 99%

Relationship between the Proton Conductive Performance and Water Uptake Ratio on a Filler-Filled Polymer Electrolyte Membrane

et al. 2022

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Polymer electrolyte fuel cells are attracting attention as clean, highly efficient power generation devices that can solve problems such as energy resource depletion, global warming, and environmental pollution. In this research, we have fabricated proton conductive filler-filled membranes, employing polymer-coated cellulose nanocrystals and different binder resins. Moreover, we have demonstrated the relationship between proton conductivity and water uptake of binder resins. It was clarified that the fabricated membrane with a high water uptake ratio showed excellent proton conduction performance under high humidity at low temperatures with a low activation energy for proton conduction. The substantiation of the compatibility relationship between water absorption and efficacy of proton conduction can contribute to the design and fabrication of a new binder resin synthesis model and contributes to the knowledge of the polymer skeleton structure for the improvement of the proton conductive performance of polymer electrolyte membranes.

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Section: Introductionmentioning

confidence: 99%

Relationship between the Proton Conductive Performance and Water Uptake Ratio on a Filler-Filled Polymer Electrolyte Membrane

et al. 2022

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“…The original decomposition temperature of Im was 150 to 200 °C, suggesting here that the formation of ionic liquids with PVPA enhanced the heat resistance. [ 53 ] Based on previous studies, it has been found that PAA decomposes at 500 °C, while PS shows a rapid weight loss at 300 to 400 °C. [ 54 ] Silica@PVPA/Im/PAA‐ b ‐PS have indicated a weight loss corresponding to PAA and PS from 200 to 500 °C.…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication Technique of Polymeric Ionic Liquids‐Coated Core–Shell Nanoparticles for Polymer Electrolyte Membranes

Tabata,

Makino,

Matsuo

et al. 2023

Advanced Sustainable Systems

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Nanoparticles and nanofibers are widely used as components of polymer electrolytes for membranes in fuel cells, and many surface modification methods are reported. However, some fabrication techniques are complicated, and it is necessary to develop a simplified and precise control method. Herein, a facile fabrication method is reported for core–shell nanoparticles hierarchically coated with polymeric ionic liquids (PIL) and hydrophobic polymers as a material for polymer electrolytes. A hierarchical polymer layer on the surface of the SiO2 nanoparticles is easily constructed by repeating the facile polymer‐coating technique based on precipitation polymerization several times. The highest proton conductivity of the core–shell nanoparticles is 1.3 × 10−2 S cm−1 at 80 °C and 95% relative humidity. Although the hydrophobic polymers coated as a protective layer reduce the proton conductivity, the formation of the PIL enhances the proton conductivity in various temperature and humidity environments. Therefore, the proposed method enables the facile fabrication of polymer layers with multiple functions, such as a proton‐conductive PIL layer and hydrophobic polymer layers as protective layers on the surface of the nanoparticles. Furthermore, they are expected to be applied to energy supply and gas separation, including polyelectrolytes, for the realization of a sustainable society.

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“…These results compared to our previous study, the proton conductivity of block copolymer of PILs and polystyrene (PILs-b-PS) was 1.6 × 10 −4 S cm −1 (80 °C, 80% RH) and 4.5 × 10 −5 S cm −1 (80 °C, 70% RH), respectively. 19) In contrast, silica@PILs-10X 1 was 5.0 × 10 −3 S cm −1 (80 °C, 80% RH) and 6.9 × 10 −4 S cm −1 (80 °C, 70% RH), respectively. Surprisingly, even similar types of PILs succeeded in improving proton conductivity depending on the sample states.…”

Section: Sample Namementioning

confidence: 90%

“…17,18) According to these facts, although the ILs exhibited high proton conductivity in low-humidity environments, their fluidity due to lower melting point was a concern for leaching from PEM. [19][20][21] In order to suppress their fluidity, some approaches have been reported that cross-linking with ILs each other and mixing them into polymer matrixes. [22][23][24][25][26][27][28] However, these methods decrease the proton conductivity of PEM.…”

Section: Introductionmentioning

confidence: 99%

Proton conductive nanoparticles coated with polymeric ionic liquids via RAFT polymerization with particles method for low-humidity proton conduction

Nakazaki

Tabata

Nohara

et al. 2023

Jpn. J. Appl. Phys.

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Proton conduction in the current polymer electrolyte membrane depends on water molecules, which necessitates high-humidity environments. On the contrary, proton conduction in low-humidity environments has been required for expanding operation conditions of polymer electrolyte fuel cells. Recently, ionic liquids (ILs) have been focused on novel proton conductive materials, however, the ILs were hard to fabricate the self-standing membrane owing to their fluidity. In this paper, we have developed composite materials composed of ILs and inorganic nanoparticles by coating ILs as polymer states (PILs) on the surface of nanoparticles. Notably, this material has obtained a powder form, and we have succeeded in suppressing the fluidity of ILs. The PILs-coated nanoparticles have achieved good proton conductivity over 10-2 S cm-1 at 95%RH, also indicated over 10-4 S cm-1 under 60%RH. In addition, we have clarified the relationship between the thickness of PILs and proton conductivities.

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Proton-conductive polymeric ionic liquids block copolymer of poly(vinylphosphonic acid)/1-propylimidazole-b-polystyrene for polymer electrolyte membrane fuel cells

Cited by 5 publications

References 36 publications

Relationship between the Proton Conductive Performance and Water Uptake Ratio on a Filler-Filled Polymer Electrolyte Membrane

Relationship between the Proton Conductive Performance and Water Uptake Ratio on a Filler-Filled Polymer Electrolyte Membrane

Facile Fabrication Technique of Polymeric Ionic Liquids‐Coated Core–Shell Nanoparticles for Polymer Electrolyte Membranes

Proton conductive nanoparticles coated with polymeric ionic liquids via RAFT polymerization with particles method for low-humidity proton conduction

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