共价有机框架与氧化中心和吸附部位相结合,可提供高效的无穿Zn-电池
Jing-Dong Feng1, Wang-Kang Han1, Jun-Jun He1
1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P.R. China.
带有和硫位点的编织共价有机框架 (COF) 有效地抑制了水性-电池中的多化物穿. 这一突破提高了电池性能和稳定性,用于下一代储能.
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:
- 水性- (Zn-I2) 电池提供了有前途的能量存储,但受到聚酸穿的影响,限制了性能.
- 穿效应涉及聚化离子的迁移,导致容量衰减和周期寿命低下.
研究的目的:
- 设计和合成新的共价有机框架 (COF) 作为Zn-I2电池的无穿天极材料.
- 为了减轻聚酸穿效应,并提高Zn-I2电池的电化学性能.
主要方法:
- 编织COF (COF-RuNCS-X) 的制造,其中包含 (II) 反氧化中心和硫吸附点.
- 对COF-RuNCS-X材料的特性包括它们的多孔结构,硫吸附能力和电化学特性.
- 使用COF-RuNCS-X作为阴极材料评估Zn-I2电池的性能,重点关注容量,稳定性和穿效应减轻.
主要成果:
- COF-RuNCS-X材料选择性地吸附三化物 (I3-) 种,有效地抑制了穿效应.
- 集成的 (II) 中心加速了物种的氧化还原动力学.
- COF-RuNCS-6实现了395.8 mAh g-1的高排放特异性容量,并证明了高达5000个周期的卓越循环稳定性.
结论:
- 具有量身定制的和硫位点的编织COF是Zn-I2电池的有效的无穿阴极材料.
- 这一策略显著提高了水性Zn-I2电池的性能和稳定性.
- 该研究提供了对设计高性能能源存储系统的先进COF基材料的见解.
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