通过接口内置电场操纵硫转换动力学,在硫电池中增强双向Mott-Schottky电催化剂
Guo Liu1, Qi Zeng2, Qingfeng Wu1
1Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China.
ACS applied materials & interfaces
|August 9, 2023
概括
使用VO2@rGO异构的新型Mott-Schottky电催化剂通过增强聚硫化物捕获和转化,显著提高硫电池性能. 这一突破解决了先进的储能设备面临的关键挑战.
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:
- 硫 (Li-S) 电池需要高效的电催化剂来克服聚硫化物 (LiPS) 穿,并改善反应动力学.
- 开发先进的材料对于提高Li-S电池的性能和周期寿命至关重要.
研究的目的:
- 开发多功能VO2@rGO异构结构作为Mott-Schottky电催化剂用于Li-S电池.
- 调查接口内置电场 (BIEF) 增强在提高电化学性能方面的作用.
- 了解用于增强LiPS转化和Li-ion扩散的催化机制.
主要方法:
- 合成VO2@rGO异构结构.
- 用修改过的分离器对Li-S电池进行电化学性能测试.
- 理论分析以阐明BIEF效应和催化机制.
- 对LiPS化学吸收和离子扩散的研究.
主要成果:
- VO2@rGO异构结构展示了一个接口BIEF,促进了电荷再分配和加速的电荷传输.
- 观察到增强的LiPS化学吸收和减少Li2S核化/分解的能量障碍.
- 莫特-肖特基电催化剂表现出显著的"捕获-转换"效应.
- 带有VO2@rGO修改分离器的Li-S电池实现了高可逆容量 (558.0 mAh g-1在2 C) 和出色的循环稳定性 (0.048%的衰变每周期超过600个周期).
结论:
- 开发的Mott-Schottky电催化剂有效地抑制了LiPS的穿,并增强了Li-S电池中的转换动力学.
- 接口BIEF在优化电荷传输和催化活动方面发挥着至关重要的作用.
- 这项研究为设计高效能储能装置的先进电催化剂提供了洞察力.
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