抄録
Self-polymerized dopamine is a versatile coating material that has various oxygen and nitrogen functional groups. Here, we demonstrate the redox-active properties of self-polymerized dopamine on the surface of few-walled carbon nanotubes (FWNTs), which can be used as organic cathode materials for both Li- and Na-ion batteries. We reveal the multiple redox reactions between self-polymerized dopamine and electrolyte ions in the high voltage region from 2.5 to 4.1 V vs. Li using both density functional theory (DFT) calculations and electrochemical measurements. Free-standing and flexible hybrid electrodes are assembled using a vacuum filtration method, which have a 3D porous network structure consisting of polydopamine coated FWNTs. The hybrid electrodes exhibit gravimetric capacities of ∼133 mA h g-1 in Li-cells and ∼109 mA h g-1 in Na-cells utilizing double layer capacitance from FWNTs and multiple redox-reactions from polydopamine. The polydopamine itself within the hybrid film can store high gravimetric capacities of ∼235 mA h g-1 in Li-cells and ∼213 mA h g-1 in Na-cells. In addition, the hybrid electrodes show a high rate-performance and excellent cycling stability, suggesting that self-polymerized dopamine is a promising cathode material for organic rechargeable batteries.
本文言語 | English |
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ページ(範囲) | 205-215 |
ページ数 | 11 |
ジャーナル | Energy and Environmental Science |
巻 | 10 |
号 | 1 |
DOI | |
出版ステータス | Published - 2017 1月 |
ASJC Scopus subject areas
- 環境化学
- 再生可能エネルギー、持続可能性、環境
- 原子力エネルギーおよび原子力工学
- 汚染