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不同结构的MoO₃@CoWO₄纳米带通过氧气空缺产生的高电化学性能

Ramzi Nasser¹, Hao Zhou¹, Feng Li²

¹School of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, Anhui 230601, PR China.

Journal of colloid and interface science

|October 23, 2023

概括

新的异构三氧化@ tungstate (MoO3@CoWO4) 纳米带显示出作为正极材料的出色性能. 这些材料具有高容量,稳定性和显著降低的自放电,用于先进的储能应用.

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:

异构纳米材料通常会由于接口而表现出增强的特性.
氧气空缺 (Vo) 在异构结构中很普遍,可以影响材料性能.
开发高效的阴极材料对于先进的储能设备至关重要.

研究的目的:

为了合成和描述新型异构的MoO3@CoWO4纳米带.
为了评估它们作为超级电容器的阴极材料的性能.
调查氧气空缺在设备性能和自放电中的作用.

主要方法:

合成MoO3@CoWO4异构纳米带的合成.
使用扫描电子显微镜 (SEM) 和传输电子显微镜 (TEM) 的形态和结构特征.
使用X射线光电谱 (XPS) 和电子磁共振 (EPR) 分析氧气空缺.
电化学性能测试,包括电容,速率能力和循环稳定性.
全固态超级电容器设备的制造和测试.

主要成果:

SEM和TEM证实MoO3纳米带完全被CoWO4纳米点覆盖.
XPS和EPR数据验证了氧气空缺 (Vo) 的产生.
该MoO3@CoWO4电极实现了246mAh·g-1的高电容 (1966年F·g-1在0.5A·g-1).
观察到优异的速率能力 (174mAh·g−1在30A·g−1) 和稳定性 (94%超过15,000个周期).
一个完全固态装置提供了63.1Wh·kg-1的能量密度.
超级电容器的自放电率较低 (24小时内12.1%).

结论:

在MoO3@CoWO4纳米带中的协同效应和氧气空缺有助于优越的电化学性能.
氧气空缺在控制离子扩散和减少自放电方面发挥着至关重要的作用.
这些异构材料对高性能超级电容器有显著的前景.

关键词:

储能储能是指储能过程中的能量.异面接口异面接口 MoO(3)@CoWO(4) 的核心外.空缺的氧气位超级容量的超级容量

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