一个双碳离子电容器由空心碳纤维电极与减少的图形化启用
Xiaojun Shi1, Huanwen Wang1, Zeren Xie1
1Faculty of Material and Chemistry, China University of Geosciences, Wuhan, 430074, China.
Advanced materials (Deerfield Beach, Fla.)
|July 20, 2024
概括
研究人员使用ZrO2模板开发了一种新的双碳离子电容器. 这种设计提高了离子储存能力和设备寿命,克服了大型离子带来的挑战.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子 (K+) 储存器由于K+离子的大小 (1.38 Å) 而面临挑战,影响动力学和寿命.
- 开发高效的电极材料对于推进离子储能技术至关重要.
研究的目的:
- 设计和制造一个高性能双碳离子电容器.
- 用一个反应模板来创建具有增强K+离子适应性的电极材料.
主要方法:
- 用纤维式二氧化 (ZrO2) 膜作为反应模板合成N-doped空心石墨碳纤维.
- 合成的碳材料以其结构性质而闻名,包括层间间距和兴奋剂.
- 使用制造的电极组装了离子混合电容器,并对电化学性能进行了测试.
主要成果:
- 催化ZrO2的石墨碳呈现出一个无序的结构,间层间距扩大 (0.378nm),促进K+离子的插入/提取.
- 兴奋剂引入了局部K+储存的地点,而不会破坏石墨间隔化合物形成.
- 由此产生的N-doped空心碳纤维电极实现了商业石墨的K+存储容量的1.5倍.
- 组装的离子混合电容器表现出高功率 (40,000 W kg-1),快速充电 (8.5 秒),良好的循环稳定性 (在 5000 个循环后保持 93%),以及低自放电 (8.6 mV h-1).
结论:
- 开发的格子扩展管状碳电极,采用ZrO2模板,提供卓越的K+存储能力和动力学.
- 这些电极的高性能和可扩展性代表了实际离子电容器的重大进步.
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