デュアル・レドックス・サイトは,大きな偽容量と広い潜在窓を持つ二次元結合金属有機フレームワークを可能にします
Panpan Zhang1, Mingchao Wang1, Yannan Liu1
1Center for Advancing Electronics Dresden (cfaed) and Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Mommsenstraße 4, 01062 Dresden, Germany.
Journal of the American Chemical Society
|June 29, 2021
まとめ
2D結合金属有機フレームワーク (c-MOF) を開発しました これらの材料は高容量と広い潜在的な窓を提供し,エネルギー貯蔵性能を改善します.
科学分野:
- 材料科学
- 電気化学
- ナノテクノロジー
背景:
- 先進的な超電容器電極は,導電性,多孔構造の内部に濃厚な酸化還元部位を持つ材料を必要とします.
- 二次元の (2D) 結合金属有機フレームワーク (c-MOF) は,導電性,表面積,並べられた毛穴により有望である.
- 既存の2D c-MOFは,低酸化還元位密度による特定の容量および潜在的な窓に制限があります.
研究 の 目的:
- スーパーキャパシタアプリケーションのための強化されたリドックス活性を持つ新しい2Dc-MOFを設計し,合成する.
- 銅フタロシアニンベースのc-MOFの二重酸化還元部位を調査し,電気化学的性能を改善する.
- これらの新しい材料の潜在的な窓と特定の容量を評価する.
主な方法:
- 銅ファタロシアニンと金属ビス (イミノベンゾセミキノイド) のビルディングブロック (M2[CuPc (NH)) 8),M = NiまたはCu) を使用した二重リドックスサイト2Dc-MOFの合成.
- 循環式電圧測定,電静電荷放電,電気化学阻力スペクトロスコーピーを含む電気化学的特徴付け.
- 異なるコンポーネントのリドックスサイトとしての役割を検証するための理論的計算.
- 準固体対称超電容器の組立は,実用的なアプリケーションテストのために.
主要な成果:
- 合成されたM2[CuPc(NH) 8物質は,フタロシアニン単体と金属-ビス ((イミノベンゾセミキノイド) 結合からの二重酸化還元部位を示している.
- これらの材料は,カチオン (Na+) とアニオン (SO42-) の両方を幅広いポテンシャルウィンドウ (-0.8〜0.8V vs Ag/AgCl) 内で継続的なファラダイ反応を可能にします.
- Ni2[CuPc(NH) ]は,0.5 A g-1で400 F g-1の特異容量を示し,優れた速度能力 (20 A g-1で183 F g-1) と適正な伝導性 (0.8 S m-1) を示した.
- 組み立てられたスーパーコンデンサは,51.6Wh kg-1の高いエネルギー密度と32.1kW kg-1のピークパワー密度を達成しました.
結論:
- M2[CuPc(NH) 8) をベースにした2D c-MOFは,以前の材料の限界を効果的に解決します.
- 設計された材料は,スーパーキャパシティーの特定の容量とより広い潜在的なウィンドウを大幅に改善します.
- これらの発見は,次世代のエネルギー貯蔵装置に合わせた2D c-MOFの可能性を強調しています.
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