通过ab initio分子动力学模拟,了解在石墨烯支持的协调的Ru原子上的催化途径的选择
Wenqiang Ma1, Cuiyu Jing2, Ping Wu3
1School of Physics and Electronic Information & Henan Key Laboratory of Electromagnetic Transformation and Detection, Luoyang Normal University, Luoyang, 471934, Henan, People's Republic of China. npns_mwq@126.com.
这项研究模拟了--碳催化剂上的氧降解 (ORR) 和氧演化 (OER). 结果显示稳定,高效的四电子过程具有较低的超电位,突出显示了先进催化力的潜力.
科学领域:
- 计算材料科学科学 计算材料科学
- 催化剂是一种催化剂.
- 表面化学 表面化学
背景情况:
- 研究了氧降解反应 (ORR) 和氧演化反应 (OER) 在石墨烯支持的协调原子 (Ru-N-C) 上.
- 探讨了协调对电子特性,吸附能量和单原子活性位点的催化活性的影响.
研究的目的:
- 模拟和理解ORR/OER在Ru-N-C单原子催化剂上的催化机制.
- 为了确定关键反应步骤的超电位和吉布斯自由能量变化.
- 在操作条件下评估Ru-N-C的结构稳定性和反应路径.
主要方法:
- 密度函数理论 (DFT) 使用PBE对电子和吸附性能具有功能.
- Dmol3包与PNT基础集和DFT半核伪潜力用于结构优化和计算.
- 使用B3LYP功能和DNP基础集的初始分子动力学 (AIMD) 模拟 (10 ps,NVT组合,300 K)
主要成果:
- 在Ru-N-C上,ORR的计算超电位为1.12 eV,OER的计算超电位为1.00 eV.
- 详细的吉布斯自由能量 (ΔG) 计算在ORR/OER中的每个反应步骤.
- AIMD模拟证实了Ru-N-C在300K的结构稳定性,并确定了典型的四电子反应路径.
结论:
- 对于ORR/OER来说,Ru-N-C表现出有希望的催化活性和结构稳定性.
- 这项研究提供了对单原子催化剂在催化过程中的原子相互作用的深入了解.
- 协调在调整基于的单原子催化剂的性能方面发挥着至关重要的作用.
更多相关视频
08:40Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
08:18Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
Published on: March 4, 2021
相关概念视频
Introduction to Mechanisms of Enzyme Catalysis
Catalysis
Rate-Determining Steps
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
