生物空洞多孔碳纳米纤维用于能量密度和离子快速存储
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Fabrication of VB2/Air Cells for Electrochemical Testing
Published on: August 5, 2013
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Guangjie Yang1, Qian Zhang1, Chenweijia He1
1Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing, 210037, China.
Angewandte Chemie (International ed. in English)
|December 31, 2024
概括
研究人员为离子混合电容器 (ZIHC) 开发了仿生碳纳米纤维. 这些材料通过优化孔隙结构和离子可访问性来提高能量密度和稳定性,从而推进能量存储解决方案.
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:
- 离子混合电容器 (ZIHC) 中的多孔碳阴极存在空间利用不足和对内部孔的访问有限的问题,阻碍了高能量密度.
- 高效的离子传输和最大化的电极/电解质接口对于提高ZIHC性能至关重要.
研究的目的:
- 制造薄壁空心碳纳米纤维 (CNFs),其孔隙结构和表面功能组为ZIHCs优化.
- 通过模仿生物毛细血管功能来增强ZIHC的能量密度,离子储存能力和运输动力学.
主要方法:
- 使用一种简单的协调-热解方法来合成仿生CNF.
- 合成的CNFs的特征是使用in situ/ex situ光谱技术,动力分析和理论计算的组合.
- 组装ZIHC并进行测试,以评估其电化学性能,包括能量密度和循环稳定性.
主要成果:
- 毛细管状的CNF显著增加了电极/电解质接口面积,并优化了离子储存.
- 在CNF中设计的孔径大小促进了化[Zn(H2O) ]2+的容纳,改善了离子储存和运输动力学.
- 由此产生的ZIHC显示出132.8Wh/kg的高能量密度,特殊的稳定性 (98.7%在8万个周期内保持),以及高面积容量.
结论:
- 仿生CNF为设计高性能离子储存碳纳米材料提供了一个新的策略.
- 优化的微观结构和CNF中的可逆吸附过程是ZIHCs优越的储能性能的关键.
- 这项研究为ZIHC技术的进步提供了对正极存储机制的关键见解.
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