第一原则计算和机器学习的进化反应活动的非金属化β-Mo2C支持Pt单原子催化剂
Minhui Song1,2,3, Mei Yang1,4, Shuo Yang3
1Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China.
ACS applied materials & interfaces
|October 5, 2024
概括
(Pt) 是进化反应 (HER) 的昂贵催化剂. 这项研究探讨了使用非金属化碳 (Mo2C) 支持的新型单原子催化剂 (SAC),确定高活性和具有成本效益的替代品,以有效生产.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 计算化学计算化学
背景情况:
- (Pt) 是演化反应 (HER) 的基准催化剂,但其高成本和稀缺性需要替代品.
- 单原子催化剂 (SAC) 提供了一种策略,可以最大限度地提高贵金属原子的效率,如Pt.
- 开发具有成本效益和高活性的HER催化剂对于推进绿色技术至关重要.
研究的目的:
- 通过计算选和识别进化反应 (HER) 的新型单原子催化剂.
- 研究非金属化β-碳化物 (β-Mo2C) 表面作为分散的Pt原子支物的潜力.
- 了解控制 HER 在 Pt@NM-Mo2C 系统中的活动的电子结构与属性关系.
主要方法:
- 用密度功能理论 (DFT) 的计算来模拟和评估117个候选Pt@NM-Mo2C催化剂的HER活性.
- 计算了中间体 (H*) 吸附的吉布斯自由能量 (ΔGH*),作为催化性能的主要描述值.
- 机器学习 (ML) 模型被用来识别影响 HER 活动的关键因素,包括电荷转移,d 波段中心和原子半径.
主要成果:
- 在117个选的催化剂中,有49个显示出出色的HER活性, ΔGH*值低于0.2 eV.
- 与Pt相比,16个催化剂表现出更高的性能,ΔGH*值低于Pt的≈0.09 eV.
- PtI@N2/4-a-Mo2C催化剂显示了最高的活动 (ΔGH* = -0.01 eV),归因于优化的电子相互作用和Pt-H键强度.
结论:
- 非金属化β-Mo2C支可以有效地定单个Pt原子,产生高度活性的HER催化剂.
- 在Pt和dopant原子之间的电荷转移显著影响Pt-H键强度,从而影响HER活性.
- Pt (NePt),Pt d频段中心 (εdPt) 和NM原子半径 (R_NM) 的Bader电荷转移是预测这些系统中HER性能的关键描述符.
更多相关视频
10:52Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
12.8K
10:57Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
18.1K
相关概念视频
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.2K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.2K
Reduction of Alkenes: Catalytic Hydrogenation
11.9K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called 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...
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...
11.9K
Catalysis
26.7K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
26.7K
