增强用于先进离子电容器的碳超结构的离子兼容孔中的空间电荷存储
Pingxuan Liu1, Ziyang Song1, Ling Miao1
1Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|April 15, 2024
概括
具有精确匹配孔径的新型碳超结构增强了离子混合电容器 (ZHC). 这些材料为先进的储能应用提供了更高的能量密度,快速充电和更长的周期寿命.
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:
- 电容性碳阴极对离子混合电容器 (ZHC) 是有前途的,因为它拥有丰富的资源和结构灵活性.
- 一个关键的挑战是碳微孔和化Zn2+离子之间的尺寸不匹配,限制了电荷储存.
- 优化孔隙结构对于高效的离子运输和高性能ZHC至关重要.
研究的目的:
- 设计和合成精心排列的异原子碳超结构,以优化孔径来增强Zn2+离子激活.
- 研究ZHC中这些新型碳阴极的电荷储存机制和电化学性能.
- 探索超分子自我组装的潜力,以创建用于储能的先进碳材料.
主要方法:
- 1,3,5-triazine-2,4,6-triamine和酸的超分子自我组装使用在平面中的键和在平面之外的π-π相互作用.
- 花形碳层结构的特征,重点关注孔径大小分布 (亚纳米孔和中孔).
- 在ZHC中对碳超结构作为阴极进行电化学测试,以评估能量密度,充电速度和循环稳定性.
主要成果:
- 合成的花形碳超结构具有亚纳米孔 (0.82 nm),仅可用于化Zn2+离子 (0.86 nm).
- 实现了高能量密度 (158 Wh kg-1),快速充电能力 (50 A g-1),以及ZHCs的卓越循环寿命 (100,000 个周期).
- 阐明了一种离子-离子混合电荷储存机制,涉及离子吸收和与异质原子的化学结合.
结论:
- 设计的碳超结构有效地解决了尺寸不匹配问题,大大提高了ZHC的性能.
- 超分子自我组装提供了一个可行的途径,用于创建具有针对储能特性的层次性多孔碳.
- 这项工作扩大了高级碳材料在高性能电化学能量存储设备中的设计策略.
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