電気化学用途のポリ (ビニルベンジルトリメチルアモニウム) -ポリ (メチルブチレン) 膜におけるヒドロキシル密度と放緩の相互作用

Keti Vezzù^1,2, Ashley M Maes³, Federico Bertasi^1,4

¹Section of Chemistry for Technology, Department of Industrial Engineering, University of Padova, in Department of Chemical Sciences , Via Marzolo 1, I-35131 Padova, Italy.

Journal of the American Chemical Society

|January 10, 2018

まとめ

異なったイオン交換能力を持つアニオン交換膜 (AEM) を分析した. 重要な移行はイオン伝導性に影響を及ぼし,クラスタリングにより高容量膜での輸送が妨げられます.

科学分野:

ポリマー科学と工学
材料科学
電気化学

背景:

アニオン交換膜 (AEM) は燃料電池のような電気化学的用途に不可欠です.
性能の最適化には熱的および電気的性質を理解することが不可欠です.
ポリ (ビニルベンジルトリメチルアモニウム) -b-ポリ (メチルブチレン) ベースのAEMは,調節可能な性質を提供します.

研究の目的:

異なるイオン交換能力 (IEC) を有するAEMを包括的に特徴付ける.
熱変換,電気特性,イオン伝導性の関係を解明する.
導電性メカニズムを提案し,アニオン輸送を制限する要因を理解する.

主な方法:

高解像度温度計 (HR-TGA)
変調差分スキャニングカロメトリー (mDSC)
ダイナミック・メカニカル分析 (DMA)
ブロードバンド電気スペクトロスコーピー (BES)

主要な成果:

IECに依存するグラストランジション (Tg) と無秩序-秩序トランジション (Tδ) を特定した.
分極化 (σEP,σIP,1) と介電リラクゼーション (β1,β2) を特定した電気反応の特徴.
Tδ (>20°C) で観測されたイオン対の二極再配置により,イオン伝導性が著しく低下し,クラスタリングはより高いIEC膜に影響する.

結論:

AEMには二重伝導経路メカニズム (σEPとσIP,1) が提案されている.
乱れ-順序の移行 (Tδ) は,二極を並べ替えることで,イオン伝導性に大きく影響する.
高いIEC膜のクラスタリングは,効率的なアニオン輸送を阻害し,AEM設計の重要な要因を強調します.

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