为电气双层电容器量身定制纤维素面条衍生的活性碳的宏观/中等/微孔结构
Hyeong-Rae Kim1, Myeong-Hun Jo1, Hyo-Jin Ahn1
1Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea.
Materials (Basel, Switzerland)
|July 27, 2024
概括
研究人员开发了具有层级毛孔的纤维素面条衍生活性炭 (CNAC),以增强电双层电容器 (EDLC) 中的离子运输. 这种优化的材料显示出优越的超快速速率能力,用于储能应用.
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
- 纳米技术 纳米技术
背景情况:
- 活性炭 (AC) 对于电双层电容器 (EDLC) 是至关重要的.
- 在交流电流的多孔性中,缓慢的离子传输动力学限制了在快速充放电条件下EDLC的性能.
- 层次性孔隙结构可以增强离子运输和提高速率能力.
研究的目的:
- 为了合成纤维素素面条衍生的活性炭 (CNAC) 与量身定制的等级孔隙结构.
- 为了研究KOH度对孔隙结构和表面化学的影响.
- 为了评估CNAC在超快EDLC中的性能.
主要方法:
- 使用KOH,化学激活纤维素素面条衍生的碳.
- 调整KOH度以控制宏/大/微孔体积分和特定表面积.
- 孔隙结构和表面化学结合状态 (C=O,pyrrolic-N,graphitic-N) 的表征.
- 在快速充放电条件下的EDLC中CNAC的电化学测试.
主要成果:
- 成功合成了具有等级孔径的大小的CNAC.
- KOH度有效调节孔隙结构和特定表面积.
- 优化的KOH激活改变了表面化学结合比.
- 在EDLC中,优化的CNAC表现出132.0 F/g的超快速速率能力,在10 A/g时达到132.0 F/g.
结论:
- 层次结构的CNAC促进EDLCs的离子运输动力学.
- 量身定制的多孔结构和表面化学是高性能能量存储的关键.
- 来自纤维素面条的活性炭是超快速EDLC的有希望的材料.
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