尼科-LDH电极的CoCx-诱导的界面八面体Co2+位点,改善了对高性能超级电容器的远程反应性
Baoyi Yin1, Liang Hao2, Xiaogan Li1
1School of Microelectronics, Dalian University of Technology, Dalian 116024, China.
Journal of colloid and interface science
|August 10, 2023
概括
这项研究引入了超级电容电极的新型3D层次异构结构,通过创建氧气空缺来增强能量储存. 这种新材料在先进的储能应用中表现出卓越的速率能力和循环稳定性.
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
- 纳米技术 纳米技术
背景情况:
- 电池类型的电极材料具有高的理论电容,但由于表面反应性差和电活性点不足而受到限制.
- 有效的空位调节对于提高这些材料的实际电荷储存能力至关重要.
研究的目的:
- 为独立的超级电容电极开发一种新的三维 (3D) 层次的异构结构.
- 在电池类电极材料中设计丰富的氧气空缺,以提高电化学性能.
主要方法:
- 在导电泡上制造一个CoCx@NiCo-LDH异构结构.
- 使用密度函数理论 (DFT) 计算来理解氧气空缺在降低OH-吸附能量的作用.
- 电化学性能的表征,包括速率能力,循环稳定性和不对称设备中的能量/功率密度.
主要成果:
- CoCx@NiCo-LDH/NF电极表现出超高速率的能力 (2330 mF cm-2在0.3 mA cm-2) 和显著的循环性能 (81.6%的保留经过10,000个循环).
- 不对称的设备在798μW cm-2的功率密度下实现了246μWh cm-2的高能量密度,具有出色的循环稳定性 (在10,000个循环后保持87.8%).
- DFT的计算证实,在界面八面体Co2+位点的氧气空缺有效降低OH-OH吸附能量.
结论:
- 该研究提出了一种简单有效的策略,通过空位调制来构建高性能电池类电极.
- 开发的CoCx@NiCo-LDH/NF材料显示出在能源储存,运输和通信方面的应用潜力很大.
- 由CoCx诱导的现场重建是形成氧空缺和增强电化学性能的关键.
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