顺序多孔的Mn-Cospinel氧化物 (CoMn2O4) 与空位调节作为Li-O2电池的高效电催化剂
Linna Dai1, Xin Zhou1, Yuan Yang2
1School of Science, Hubei University of Technology, Nanli Road #28, Wuhan, Hubei Province 430068, China.
Journal of colloid and interface science
|May 24, 2024
概括
在CoMn2O4催化剂中的氧空位显著提高了非水性氧电池的性能. 这项研究表明,氧气空缺增强了LiO2吸附,并减少了过量的电能,以改善电池循环.
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
- 催化剂是一种催化剂.
背景情况:
- 非水性氧电池 (LOB) 提供高的理论能量密度.
- 对于LOB来说,CoMn2O4催化剂是有希望的,但空缺效应尚不清楚.
- 催化剂的空缺工程是提高电化学性能的关键.
研究的目的:
- 调查在CoMn2O4中空缺类型与它们在LOB中的催化活性之间的关系.
- 了解氧气和金属空缺如何影响LiO2吸附和Li2O2形成.
- 为了优化CoMn2O4合成以提高LOB性能.
主要方法:
- 使用聚烯球体作为模板进行有序多孔CoMn2O4的溶热合成.
- 温度控制的烧焦调整氧气和金属空隙度.
- 用合成催化剂对LOB进行电化学测试.
- 实验和理论计算来分析空缺效应.
主要成果:
- 合成产生了CoMn2O4,根据化温度变化氧气和金属空位.
- 较高的化温度减少了氧气空缺,增加了金属空缺.
- 发现氧气空缺在调节LiO2吸附和减少过量的潜力方面比金属空缺更为关键.
- 在500°C (CoMnO-500) 合成的富含氧空缺的CoMn2O4,表现出卓越的性能.
结论:
- 在CoMn2O4中的氧气空缺显著增强了LiO2吸附,并促进了Li2O2膜的形成.
- 在LOB中,CoMnO-500催化剂实现了最低的超电位 (1.2V) 和最长的周期寿命 (286个周期).
- 这项工作为优化LOB催化剂和理解排放产品形成途径提供了对空缺工程的关键见解.
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