联对鲁TiO2单个原子稳定性的关键作用:一项第一原则研究
Sourav Ghoshal1,2, Chidozie Ezeakunne3, Yonghyuk Lee4,5
1Department of Physics, Florida A&M University, Tallahassee, Florida 32307, United States.
ACS applied materials & interfaces
|February 10, 2026
概括
在TiO2上的白金单原子催化剂在还原条件下表现出极好的稳定性,防止烧结. 这项研究使用DFT量化了催化剂稳定性,指导了化应用的未来材料设计.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
背景情况:
- 在TiO2上的单原子催化剂 (SAC) 对化至关重要,但它们在减少条件下的稳定性是一个挑战.
- 吸附显著影响金属支相互作用,扩散和聚合,影响催化剂的寿命.
- 了解SAC稳定性对于开发强大的工业应用催化剂至关重要.
研究的目的:
- 为了研究Rh,Ag,Pt和Au SACs在 rutile TiO2 (110) 上的热力学和运动稳定性.
- 评估表面缺陷 (氧气空缺,化) 和吸附对SAC稳定性的影响.
- 建立一个定量框架来预测SAC烧结行为.
主要方法:
- 使用了第一原则密度函数理论 (DFT) 的计算.
- 使用二元化能量评估了热力学稳定性.
- 用总激活能量 (E_total = E_f + E_d) 和扩散能量 (E_d) 量化动力稳定性,确定特征扩散时间 (τ).
主要成果:
- 金SAC表现出最高的E_总和最长的t,表明对烧结的抗性优越.
- 发现银SACs本质上是不稳定的.
- SACs对二分化具有热力学优势,但由于原子形成能量,E_total高,导致寿命更长.
- 黄金SACs通过表面化稳定,而吸附对每个金属的稳定性进行了不同的调节.
结论:
- 综合热力学-动力学方法可以量化预测SAC烧结行为.
- 表面修饰和吸附在稳定SAC中起着至关重要的作用.
- 该框架指导了在化条件下提高晚期过渡金属SAC稳定性的策略.
更多相关视频
09:18Time-resolved ElectroSpray Ionization Hydrogen-deuterium Exchange Mass Spectrometry for Studying Protein Structure and Dynamics
Published on: April 17, 2017
10.3K
10:10Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
Published on: December 1, 2020
5.6K
相关概念视频
The Pauli Exclusion Principle
59.6K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
59.6K
Hydrogen Bonds
134.3K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
134.3K
RNA Stability
35.8K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
35.8K
The Uncertainty Principle
32.9K
Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
32.9K
The Aufbau Principle and Hund's Rule
74.1K
To determine the electron configuration for any particular atom, we can build the structures in the order of atomic numbers. Beginning with hydrogen, and continuing across the periods of the periodic table, we add one proton at a time to the nucleus and one electron to the proper subshell until we have described the electron configurations of all the elements. This procedure is called the aufbau principle, from the German word aufbau (“to build up”). Each added electron occupies the...
74.1K
Atomic Orbitals
44.9K
An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
44.9K
