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Anion conductive polymers: new development for energy devices

Research Project

Project/Area Number 22KF0156
Project/Area Number (Other) 22F22035 (2022)
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeMulti-year Fund (2023)
Single-year Grants (2022)
Section外国
Review Section Basic Section 26040:Structural materials and functional materials-related
Research InstitutionUniversity of Yamanashi

Principal Investigator

宮武 健治  山梨大学, 大学院総合研究部, 教授 (50277761)

Co-Investigator(Kenkyū-buntansha) YADAV VIKRANT  山梨大学, 大学院総合研究部, 外国人特別研究員
Project Period (FY) 2023-03-08 – 2025-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2024: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2023: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2022: ¥700,000 (Direct Cost: ¥700,000)
Keywordsanion exchange membranes / fuel cells / water electrolyzers
Outline of Research at the Start

Designing and synthesis of alkali stable imidazolium salts, designing and synthesis of series-connected cycloaliphatic diamine-based tetra-cationic cross-linker, tethering of long alkyl chain on poly(p-phenylene) backbone, controlled cross-linking and quaternization on partially quaternized bromoalkylated poly(p-phenylene) will be carried out to develop robust AEM for anion exchange membrane fuel cell (AEMFC) applications. Other applications such as alkaline water electrolysis cells will also be investigated.

Outline of Annual Research Achievements

In this year,a series of 2,5-dichlorobenzene monomers differed in semi-fluoroalkyl pendant length were synthesized and copolymerized. The terpolymers provided bendable membranes by solution casting. The maximum ion conductivity of 112 mS/cm was achieved for the membrane formulated with C11 pendant. Cx-QPip-n membranes showed good alkaline stability, in particular, C11-QPip-1.86 retained 75% of the original conductivity after 1,056 h in harsh alkaline conditions (8 M KOH aqueous solution at 80 degrees C). C11-QPip-1.86 membrane was subjected to alkaline water electrolysis cell with Co-based platinum group metal-free anode catalyst which showed good performance. The cell was durable for 1000 h with minor voltage change at a constant current density operation.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

According to the research plan, highly conductive and alkaline stable anion exchange membranes were developed and analyzed.

Strategy for Future Research Activity

The rational design and synthesis of AEM is planned by taking into consideration the loading of maximum number of quaternary ammonium groups on poly(p-phenylene) backbone so that resultant AEMs could avail desired properties. This will accomplish in two steps: i) Partial quaternization (60-80 mol% in relation to available bromine atoms) of bromoalkylated poly(p-phenylene) using imidazolium salt which showed long term alkaline stability using both techniques (NMR investigation and Density Functional Theory), and ii) controlled degree of cross-linking with simultaneous quaternization using series-connected tetra-cationic cross-linker which also showed long term alkaline stability. This approach mitigate trade-off between hydroxide ion conductivity and mechanical stability.

Report

(2 results)
  • 2023 Research-status Report
  • 2022 Annual Research Report
  • Research Products

    (2 results)

All 2024 Other

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Remarks (1 results)

  • [Journal Article] Effect of Radical-Mediated Cross-Linking on Partially Fluorinated Aromatic Anion Exchange Membranes and their Applications in Alkaline Water Electrolysis Cells2024

    • Author(s)
      A. M. A. Mahmoud, K. Miyatake, F. Liu, V. Yadav, L. Guo, C. Y. Wong, T. Iwataki, K. Kakinuma, and M. Uchida
    • Journal Title

      Adv. Energy Sustainability Res.

      Volume: 5 Issue: 3 Pages: 2300236-2300236

    • DOI

      10.1002/aesr.202300236

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Remarks] 山梨大学クリーンエネルギー研究センター燃料電池研究部門

    • URL

      http://www.fcgroup.yamanashi.ac.jp/

    • Related Report
      2023 Research-status Report 2022 Annual Research Report

URL: 

Published: 2022-09-29   Modified: 2024-12-25  

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