在光热催化中非热效应和热效应之间的协同调节,基于修改的In2O3
Li Zhang1, Xuhan Zhang1, Hongfen Mo1
1State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
ACS applied materials & interfaces
|August 9, 2023
概括
过渡金属Fe和Cu通过增强热和非热效应来提高水分裂反应性,从而提高In2O3催化剂中的太阳能利用率. 这项研究提供了对光热合机制的见解.
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.
- 摄影化学的使用.
背景情况:
- 高效的太阳能利用需要在光热合的催化反应中增强热和非热效应.
- 基于氧化 (In2O3) 的催化剂对太阳能应用具有前景.
研究的目的:
- 探索和增强光辐射对In2O3催化剂的非热和热效应.
- 通过过渡金属修饰来提高光热协同的水分裂反应性.
主要方法:
- 用过渡金属 (Fe 和 Cu) 修改 In2O3 催化剂.
- 光学特征. 光学特征.
- 水分的实验. 分水的实验.
- 变量温度的表征. 变量温度的表征.
- 密度函数理论 (DFT) 的计算.
主要成果:
- 铁注扩大了辐射响应范围,并增强了半导体的吸收.
- doping 改善了可见红外光的吸收.
- 同时的Fe和Cu结合协同增强了辐射反应,载体分离和光热温度.
- Fe和Cu联合合的In2O3显著改善了光热协同水分裂反应性.
结论:
- 过渡金属兴奋剂 (Fe和Cu) 有效地增强了In2O3催化剂中的光热合效应.
- 反应温度在辐射吸收,转换和非热效应中起着至关重要的作用.
- DFT的计算证实,温度升高会降低速度决定步骤的能量障碍,影响化学反应.
相关概念视频
01:16Cycloaddition Reactions: MO Requirements for Thermal Activation
3.6K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
3.6K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.4K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.4K
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.0K
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.
2.0K
01:16Thermal Sigmatropic Reactions: Overview
2.1K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
2.1K
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.1K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.1K