电化学还原引起的氧气空缺和现场化策略协同构建高性能超级电容器
Kairan Hu1, Yuzhu Wan2, Ziyun Zhang1
1School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Haiquan Road 100, 201418 Shanghai, China.
Journal of colloid and interface science
|February 24, 2025
概括
研究人员开发了先进的超级电容材料,使用了 - 层叠的双氧化物和脱化物复合材料. 这些新型材料表现出增强的动力学和改进的电化学性能,用于储能应用.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 超级电容器面临缓慢反应动力学的挑战,这阻碍了它们的广泛应用.
- 开发具有快速动力学的电极材料对于推进超级电容器技术至关重要.
研究的目的:
- 在泡 (NF) 上支持的新型CoMn分层双氧化物 (CoMn-LDH) 和CoSe2复合材料的合成.
- 研究氧空位 (OV) 和异构对超级电容电极的电化学性能的影响.
- 探索这些材料在混合超级电容器中提高能量密度和循环稳定的潜力.
主要方法:
- 使用电化学还原和现场化合成OV-CoMn-LDH@CoSe2/NF.
- 材料形态,结构和缺陷的表征.
- 电化学测试包括电容量测量,速率能力和循环稳定性.
- 密度函数理论 (DFT) 计算以了解反应机制和物质离子相互作用.
主要成果:
- 合成的OV-CoMn-LDH@CoSe2/NF表现出一个核心外异构,具有缺陷的纳米薄膜,丰富的氧缺陷,并促进了电子转移.
- 在1Ag-1下达到2673.3Fg-1的高容量,在10Ag-1下进行了1万个循环后,容量保持率为89.03%,在10Ag-1下达到2673.3Fg-1的高容量.
- 一个混合超级电容器 (OV-CM@CS/NF//AC) 在10A g-1的电容保持率达到86%在10,000个循环中,能量密度为95Wh kg-1.
- DFT计算证实了异质接口和缺陷在改变电子结构和促进OH-吸附方面的作用.
结论:
- 开发的OV-CoMn-LDH@CoSe2/NF材料通过缺陷工程和异构结构设计显著提高了超级电容器的电化学性能.
- 这些发现为设计先进的储能系统的高性能阴极材料提供了有希望的策略.
- 该研究强调了了解原子层面的物质离子相互作用对于优化电化学反应的重要性.
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