潜力占主导地位 单个原子的结构重组 Mn 站点促进氧降解反应
Miaomiao Tong1, Fanfei Sun2,3, Gengyu Xing1
1Key Laboratory of Functional Inorganic Materials Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin, 150080, China.
Angewandte Chemie (International ed. in English)
|November 13, 2023
概括
这项研究设计了一种单原子位点 (SAS) 催化剂,用于氧降解反应 (ORR). 催化剂在潜在条件下动态演变其结构和价值状态,优化性能和稳定性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 单个原子位点 (SAS) 在氧减少反应 (ORR) 过程中可以经历结构变化.
- 了解对活性中心的价值状态和重建的影响对于催化剂设计至关重要.
研究的目的:
- 设计和研究具有精确的Mn-N4配置的单原子位点 (Mn-SAS) 催化剂.
- 为了跟踪ORR期间活跃中心的动态演变,使用操作同步辐射.
主要方法:
- 具有Mn-N4配置的Mn-SAS催化剂的合理设计.
- 在ORR期间操作同步辐射来监测活跃中心的动态结构和价值状态演变.
- 理论计算以阐明结构和电子变化对催化活性的影响.
主要成果:
- Mn-SAS催化剂从Mn-N4转变为Mn-N3C和Mn-N2C2配置,在电位下增加Mn值状态 (+3.0到+3.8,然后到+3.2).
- 这些动态演变优化了O2吸附,并降低了速度决定步骤的能量屏障.
- 催化剂实现了0.99V的启动电位,超过1万个周期的稳定性,以及0.85V时1.59s-1的高转速频率.
结论:
- 该研究提供了通过调节活性中心值状态和配置来构建定义良好的SAS催化剂的见解.
- 动态结构和价值状态演变是优化SAS催化剂ORR性能和稳定性的关键.
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