K-birnessite-MnO2/空洞的木类碳复合物,具有稳定和优越的水性离子储存率性能
Xueli Chen1,2, Lu Han2, Yanjiang Li2
1School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu 241000, PR China. cxl6612@126.com.
Dalton transactions (Cambridge, England : 2003)
|January 3, 2024
概括
我们开发了K-birnessite-MnO2/碳复合材料用于离子混合超级电容器 (MHS). 这提高了反应动力学,提高了能量密度和循环寿命,以有效地储存水性离子.
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:
- 氧化物是离子储存在水性混合超级电容器 (MHS) 中的关键阴极.
- 氧化中的缓慢反应动力学限制了它们在MHS设备中的实际应用.
- 提高电极导电性和活性点对于提高MHS性能至关重要.
研究的目的:
- 设计和合成新的K-birnessite-MnO2和碳复合材料 (K-MnO2/HMCs),以提高MHS性能.
- 研究3D导电碳网对K-MnO2特性和电化学行为的影响.
- 评估K-MnO2/HMCs在水性MHS中的储能能力,速率能力和循环稳定性.
主要方法:
- 使用现场生长技术合成了K-birnessite-MnO2和木样碳复合物 (K-MnO2/HMCs).
- 使用诸如静电电荷放电和循环电压计等技术来表征电化学性能.
- 分析了材料形态和结构,以了解结构和电化学特性之间的关系.
主要成果:
- 由于3D碳网,K-MnO2/HMCs表现出增强的导电性和增加的活性位点.
- 该MHS装置在0.5Ag-1下实现了168mAhg-1的特定容量.
- 在505 W kg-1的功率密度下,获得了111.1 W h kg-1的优越能量密度,以及出色的速率性能和循环寿命.
结论:
- K-MnO2 / HMCs显示出作为水性离子混合超级电容器的高性能阴极材料的巨大潜力.
- 三维导电碳网有效地改善了离子和电子的转移,促进了快速的氧化还原反应.
- 这项工作为开发高效和耐用的水性离子储存系统的先进材料提供了宝贵的见解.
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