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Updated: Jun 29, 2025

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异原子二原子CoN4-NiN4 位点对具有远程合作为可充电气电池的高效双功能催化剂
Yue Yang1, Bin Li2, Yining Liang1
1Zhuhai Institute of Advanced Technology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Zhuhai, 519000, China.
这项研究引入了一种新的Co/Ni-NC催化剂,具有独特的异质二原子位点,用于增强电催化. 这种先进的催化剂在减少氧和演化反应方面表现出卓越的性能,这对于能源应用至关重要.
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:
- 开发高效的电催化剂对于推进能源转换和储存技术至关重要.
- 添加碳材料为分散活性金属位点提供了有前途的平台.
- 异原子二原子催化剂可以表现出协同效应,以改善催化活性.
研究的目的:
- 合成和表征一种具有原子分散的异原子二原子Co/Ni活性位点的新型Co/Ni-NC催化剂.
- 研究Co和Ni站点之间的电子结构和协同效应.
- 评估CO/Ni-NC催化剂的氧降解反应 (ORR) 和氧演化反应 (OER) 的电催化性能及其在Zn空气电池中的应用.
主要方法:
- 控制ZIF-8含有Co2+和Ni2+化合物的热解,以合成Co/Ni-NC催化剂.
- 实验性表征 (例如,EXAFS,XANES) 和理论计算 (DFT) 来分析催化剂结构和电子特性.
- 电化学评估包括循环电压测量,线性扫描电压测量,以及电化学电池和气电池的长期稳定性测试.
主要成果:
- 原子分散的Co/Ni hetero-diatomic位点 (CoN4-NiN4) 的位点间距离为~0.41 nm,已成功合成.
- 观察到远距离的d-d合和Co和Ni位点之间的增强的电子移位,导致更高的双功能活动.
- /尼-NC催化剂的ORR/OER电位差距很小 (0.691V),耐久性很好,性能优于单原子催化剂和基准.
- 由Co/Ni-NC催化的Zn-空气电池实现了高特异性容量 (771 mAh g-1) 和长期运行 (340 h) 的小电压间隙 (~0.65 V).
结论:
- 具有精确控制的异原子活性位点的Co/Ni-NC催化剂显示出特殊的双功能活性和电催化稳定性.
- 和原子之间的协同相互作用是提高性能的关键.
- 这种催化剂对于高效的能量储存和转换设备,如气电池,是一个显著的进步.
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