基本上是伪电容的二维结合金属-有机框架阳极,其最低的空置分子轨道定位在-双联结中
Panpan Zhang1,2, Mingchao Wang2, Yannan Liu2,3
1State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China.
Journal of the American Chemical Society
|March 9, 2023
概括
研究人员开发了一种新的基于的二维合金属有机框架 (2D c-MOF) 用于高性能超级电容器. 这种材料在非水性电解质中表现出创纪录的容量和稳定性,为先进的储能解决方案铺平了道路.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 两个维的合金属有机框架 (2D c-MOF) 为电容电极材料提供可调节的特性.
- 对非水性超级电容器的高容量二维c-MOF需要进一步研究.
研究的目的:
- 合成和表征一种基于氨酸的二乙烯 (NiS4) 结合的新型2D c-MOF.
- 评估其对于非水性超级电容器的伪电容性.
- 探索它的高容量和稳定性的起源.
主要方法:
- Ni2[CuPcS8] 2D c-MOF 的合成
- 在1M TEABF4/乙酸电解质中进行电化学表征.
- 使用理论计算 (LUMO定位) 分析电子存储机制.
- 一个不对称的超级电容器的制造和测试.
主要成果:
- 在非水性电解质中,Ni2[CuPcS8]电极实现了创纪录的高特异电容312 Fg-1.
- 它表现出了显著的循环稳定性,在10,000个循环后保持了93.5%的电容.
- 该材料表现出两步法拉第反应,归因于NiS4链接的电子容纳.
- 使用Ni2[CuPcS8]的不对称超级电容器显示出高工作电压 (2.3V),能量密度 (57.4Wh kg-1),以及长期稳定性 (>5000周期).
结论:
- 新型Ni2[CuPcS8] 2D c-MOF具有非水性超级电容器的优秀伪电容性.
- 它的高性能源于NiS4连接的独特电子存储能力和高效的电子移位.
- 这种材料是下一代高性能储能设备的有希望的候选材料.
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