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双重活性站点,以及性结构调节,用于水性离子电池的六化酸
Bingbing Hu1, Dongshan Li1, Meixin Li1
1China-Spain Collaborative Research Center for Advanced Materials, College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
用于水性离子电池 (AZIB) 的普鲁士蓝色类似物 (PBA) 显示,在兴奋剂和β-cyclopodextrin涂层下,性能得到改善. 这通过防止水相互作用和调节离子溶解来提高容量和循环稳定性.
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:
- 普鲁士蓝色类似物 (PBA) 是水性离子电池 (AZIB) 的有希望的阴极材料,因为它们的结构性质.
- 挑战包括低特定容量和低循环稳定性,这是由于缺乏活性位点和水分子相互作用造成的.
- 瓦纳 hexacyanoferrate (VOHCF) 是一种用于AZIBs探索的PBA类型.
研究的目的:
- 为AZIBs增强PBAs的电化学性能.
- 为了解决VOHCF低容量和低循环稳定性的局限性.
- 制定一项战略,防止结构退化,并改善 Zn2+ 离子运输.
主要方法:
- 将多价纳入PBA结构,以创建与铁的双活性位点.
- 使用与β-cyclodextrin (β-CD) 的共沉方法对VOHCF表面进行修改.
- 在AZIB中对改性材料 (β-CD-VOHCF) 进行电化学测试.
主要成果:
- 来自Fe和V的双重活性位点促进了多重电子转移,增加了特定容量.
- β-CD表面层有效地保护了VOHCF免受水分子的影响,并调节了Zn2+溶解.
- 该β-CD-VOHCF阴极在0.2 A·g-1下实现了204.1 mAh·g-1的高可逆容量.
- 与VOHCF相比,在5A·g-1的3200个循环后,循环稳定性显著改善,容量保留比率高出65%,比VOHCF.
结论:
- 开发的β-CD-VOHCF材料证明了AZIBs的增强电化学性能.
- 表面修改策略有效地抑制了溶解,并提高了结构稳定性.
- 这项工作为设计高性能能量存储设备的先进PBA提供了基础.
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