四面体协调单原子催化剂对CO2电还原的旋转状态效应
Yuan Liu1,2, Xixi Ren1, Jiajun Wang1
1State Key Laboratory of Precious Metal Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
Journal of the American Chemical Society
|June 5, 2025
概括
四面体协调单原子催化剂 (TCSAC) 的旋转状态会影响二氧化碳的电还原. 通过Fe-TCSAC证明,中间旋转状态是最佳的,增强了二氧化碳吸附和转化
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 催化剂的旋转状态对电催化性能产生了重大影响.
- 四面体协调的单原子催化剂 (TCSAC) 在二氧化碳电还原方面仍未得到充分研究.
- 现有研究主要集中在非四面体协调部位上.
研究的目的:
- 研究TCSAC的旋转状态与它们的二氧化碳电还原活性之间的相关性.
- 探索旋转状态在调节催化剂-中间体相互作用中的作用.
- 为设计高性能TCSAC提供理论指导.
主要方法:
- 在 ZnO 基板上计算 TCSAC 的建模.
- 对自旋状态及其对吸附能量的分析.
- 过渡金属磁矩与二氧化碳减排限制潜力的相关性.
主要成果:
- 在过渡金属磁矩与二氧化碳减排的限制潜力之间观察到火山关系.
- 发现中间旋转状态对二氧化碳吸附和转化更有利.
- TM-t2和分子-pz轨道之间的最佳相互作用增强了催化活性.
- 在 - 0. 9 V 和 RHE 之间,Fe-TCSAC 的高法拉第效率 (FE_CO) 为 91. 6%.
结论:
- 对于TCSAC来说,旋转状态是二氧化碳电减的一个关键因素.
- 由于有利的电子相互作用,中间旋转状态提供了优越的性能.
- 这项研究提供了通过控制旋转状态来优化TCSAC的理论框架.
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
3.7K
10:59Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
Published on: May 12, 2023
3.0K
相关概念视频
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.1K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.1K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
44.8K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
44.8K
02:42Valence Bond Theory
9.7K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
9.7K
02:50Catalysis
27.7K
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.
27.7K
03:02Colors and Magnetism
12.4K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.4K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.4K
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...
3.4K