通过Cu间歇调整调整MXene属性:结合的客/主 redox和伪电容
Shianlin Wee1, Xiliang Lian2, Evgeniya Vorobyeva1
1Electrochemical Energy Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland.
ACS nano
|March 21, 2024
概括
铜离子中介化成Ti3C2Tx MXenes增强了电化学性能. 2+离子在介质时部分减少,和MXene宿主都会导致伪电容,使得性能稳定.
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:
- MXenes 是一种2D材料,通过离子间隔,具有可调节的特性.
- 在MXenes中,氧化还原活性过渡金属的间隔被研究不足.
- 了解离子行为影响MXene在储能中的应用.
研究的目的:
- 调查铜离子对Ti3C2Tx MXene的介质.
- 确定对电子和电化学性质的影响.
- 探索伪电容性行为的机制.
主要方法:
- 用于氧化状态分析的X射线吸收光谱 (XAS).
- 初始分子动力学 (AIMD) 用于结构洞察.
- 在现场XAS观察充电过程中的动态变化.
主要成果:
- 观察到Cu2+在介质后部分减少为Cu+.
- 在充电过程中确定了Cu离子和Ti3C2Tx宿主的氧化还原活性.
- 证明了离子对减少的间隙稳定性很好.
结论:
- 和Ti3C2Tx之间的电子合改变了MXene的特性.
- 由于合的氧化还原作用,Cu-MXene表现出伪电容性.
- 为设计用于电化学系统的过渡金属介质的MXenes提供了一个框架.
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