S-块单原子电催化剂,K-N4配置来源于K+ /多多巴胺,用于有效减少氧气
Niankun Guo1, Hui Xue1, Rui Ren2
1College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, P. R. China.
Angewandte Chemie (International ed. in English)
|September 8, 2023
概括
这项研究引入了第一个s块单原子催化剂 (K-SAC) 用于氧减少反应 (ORR). 这种新型催化剂表现出高活性和稳定性,为新的催化剂设计铺平了道路.
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:
- 单原子催化剂 (SAC) 通常使用过渡金属,而s块元素由于其电子结构被认为是催化不活跃的.
- 探索用于催化物的非传统元素仍然是材料科学中的一个重大挑战.
研究的目的:
- 报告第一个s块单原子催化剂 (K-SAC) 具有K-N4配置的氧降解反应 (ORR).
- 研究K-SAC在性介质中的催化活性,稳定性和机制.
- 在设计先进的催化材料中展示s块元件的潜力.
主要方法:
- 在添加碳 (K-N-C) 支持的单原子催化剂的合成和表征.
- 在溶液中对氧降解反应 (ORR) 的K-N-C进行电化学评估.
- 在空气电池中测试耐用性.
- 密度函数理论 (DFT) 和晶体轨道汉密尔顿群体 (COHP) 计算以阐明催化机制.
主要成果:
- 该K-N-C催化剂实现了0.908V的ORR高半波电位 (E1/2),在10,000个周期内具有特殊的稳定性.
- 催化剂的功率密度为158.1mW cm-2的显著,在气电池中使用寿命为420小时.
- DFT和COHP分析揭示了双功能活性位点 (K和C),并突出了的s轨道在ORR中间吸附中的关键作用,与过渡金属不同.
结论:
- s块K-SAC的开发挑战了在催化过程中关于s块元素惰性的传统观点.
- K-N-C催化剂在ORR方面显示出有前途的性能,与最先进的过渡金属基SAC相美.
- 这项工作为新型s块单原子催化剂的理性设计和机制理解提供了关键的见解.
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