2023 Fiscal Year Research-status Report
Anion conductive polymers: new development for energy devices
| Project/Area Number |
22KF0156
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| Allocation Type | Multi-year Fund |
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| Research Institution | University of Yamanashi |
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Principal Investigator |
宮武 健治 山梨大学, 大学院総合研究部, 教授 (50277761)
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| 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
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| Project Period (FY) |
2023-03-08 – 2025-03-31
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| Keywords | anion exchange membranes / fuel cells / water electrolyzers |
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| 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.
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| 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.
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| 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.
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