原子分散的CoN4站点和Co集群的设计,用于协同增强的氧气减少电催化剂
Jian Rong1,2, Wangyi Chen1, Erhao Gao1
1School of Environmental Science and Engineering, Changzhou University, Changzhou, Jiangsu, 213614, China.
Small (Weinheim an der Bergstrasse, Germany)
|July 2, 2024
概括
这项研究介绍了一种新的双站点催化剂,将单个原子和原子集群结合起来,以提高氧降解反应 (ORR) 的性能. 催化剂在空气电池中表现出卓越的效率,为先进的电催化剂开发铺平了道路.
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:
- 原子分散的单个金属原子和金属原子集群 (MACs) 为像氧降解反应 (ORR) 这样的反应提供了协同的催化作用.
- 开发高效和稳定的催化剂对于推进空气电池等能源转换技术至关重要.
研究的目的:
- 合成和描述一种新型的双站点催化剂,其中包括单个原子 (CoN4) 和协调原子集群 (SCo6),这些集群在S,N联合碳基质上.
- 为了研究氧降解反应 (ORR) 中这些双重活性位点之间的协同催化效应.
- 为了评估空气电池 (ZAB) 中合成的催化剂的性能.
主要方法:
- 合成一个多孔的CoSA-AC@SNC催化剂,使用一个金金属有机框架 (Co-TPyP MOF) 前体,并引入了硫源.
- 催化剂结构的特征,包括单原子位点和原子集群的共存.
- 电化学评估催化剂的ORR活动,使用诸如循环电压测量和旋转磁盘电极测量等技术.
- 在制造的空气电池 (ZAB) 中进行性能测试.
- 密度函数理论 (DFT) 计算以阐明催化机制和协同效应.
主要成果:
- 成功合成了一种双位点催化剂 (CoSA-AC@SNC) 与Co单原子位点 (CoN4) 和S协调的Co原子集群 (SCo6).
- 催化剂表现出极好的ORR性能,半波电位 (E1/2) 为0.86V,Tafel斜率为50.17mV dec-1.
- DFT计算证实了CoN4和SCo6站点之间的协同效应,增强了ORR活动.
- 使用 CoSA-AC@SNC 制造的 ZAB 实现了 174.1 mW cm-2 的高峰功率密度,并表现出了长达 148 小时的显著充/放电耐用性.
结论:
- 开发的双站点催化剂有效地利用了单原子站点和原子集群之间的协同作用,以实现高级ORR催化.
- 使用MOF前体的简单合成路径为设计先进的电催化剂提供了一个有前途的策略.
- ZAB的高性能凸显了这种催化剂在实际储能应用中的潜力.
- 这项工作有助于开发高效的原子分散金属基电催化剂.
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