通过强金属支相互作用,提高了Na+-MnO2超级电容的性能
Kailun Wang1, Junjie Wang1, Jun Qian2
1School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui 230601, China.
Journal of colloid and interface science
|December 8, 2024
概括
这项研究通过结合离子 (Na+) 并将其沉积在铜/石墨烯 (Cu/G) 复合材料上来增强二氧化 (MnO2) 超级电容器. 这一策略提高了离子迁移,导电性和电化学性能,用于先进的能量存储.
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:
- 二氧化 (MnO2) 是超级电容器的关键电极材料之一.
- 挑战包括缓慢的离子迁移,聚合和低导电性,阻碍了超级电容器的性能.
- 优化基于MNO2的超级电容器需要解决这些局限性.
研究的目的:
- 为了提高MnO2型超级电容器的电化学性能.
- 为了改善MnO2电极材料中的离子迁移和导电性.
- 开发一种用于制造高性能超级电容电极的简单策略.
主要方法:
- 利用NaMnO4作为引入Na+离子进入δ-MnO2网格的前体.
- 在铜/石墨烯 (Cu/G) 复合材料上沉积Na+-MnO2.
- 在Cu和石墨烯之间利用强金属支相互作用 (SMSI).
主要成果:
- 对Cu/G/MnO2复合材料的导电率达到了5.78 × 10-3 S cm-1,明显高于单独的MnO2.
- 经过4000个循环,在1 A g-1 时表现出 655 F g-1 的特定电容,电容保持率为95%.
- 组装了一个1.6V不对称的超级电容器 (Cu/G/MnO2阴极,碳阳极),其特定电容为75 Fg-1和能量密度为27 Wh kg-1.
结论:
- 在Cu/G复合材料上的Na+结合和沉积有效地提高了MnO2超级电容器的性能.
- 和石墨烯之间的SMSI效应在提高导电性和减少聚合方面发挥着至关重要的作用.
- 这种简单的策略为开发用于储能应用的高性能MnO2型超级电容器提供了一个有前途的途径.
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