通过轴向原子协调改善TMN4-C模型催化剂的氧化还原反应活性
Yalei Sun1, Baibiao Huang1, Ying Dai1
1School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.
The journal of physical chemistry letters
|December 17, 2024
概括
对过渡金属催化剂的非金属原子的轴向协调显著增强了电化学氧化还原反应 (NORR) 的活性. 这一策略还通过抑制演化反应 (HER) 来提高氨形成的选择性.
科学领域:
- 电触媒溶解是一种电触媒.
- 材料科学 材料科学 材料科学
- 无机化学 无机化学
背景情况:
- 传统的四协调过渡金属 (TMN4) 复合物被广泛用于电化学反应.
- 优化金属活性中心的电子结构对于增强催化活性和选择性至关重要.
- 氧化还原反应 (NORR) 是氨合成和污染物去除的重要过程.
研究的目的:
- 调查轴非金属协调对过渡金属催化剂电化学氧化还原反应 (NORR) 活性的影响.
- 通过调整活跃中心的协调微环境来探索设计先进电催化剂的新策略.
- 确定NORR有前途的催化剂,其活性和对氨形成的选择性得到改善.
主要方法:
- 用理论计算来研究电子结构和反应机制.
- 密度功能理论 (DFT) 用于分析金属活性中心和氧化之间的相互作用.
- 研究了轴非金属连接体 (O,F,Cl) 的电子吸收效应.
主要成果:
- 与传统TMN4催化剂相比,将非金属原子 (O,F,Cl) 轴向协调到TMN4结构上显著增强了NORR活性.
- 轴联体的电子吸收效应调节了本地电子结构,优化了金属-NO相互作用.
- MnN4O-C,FeN4O-C,CoN4O-C和CoN4F-C对NORR (-0.07至-0.05V) 具有超低的限制潜力.
- 轴原子使竞争的演变反应 (HER) 无能化,增加了对氨 (NH3) 形成的选择性.
结论:
- 非金属原子的轴协调是设计NORR高性能电催化剂的新有效策略.
- 调整金属连接体匹配和协调微环境对于优化催化性能至关重要.
- 鉴定到的催化剂显示了高效和选择性的电化学氨合成的巨大潜力.
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