分子和异构连接装置工程解决方案处理的结合网状寡合体:通过高效刺激分离增强光电化学进化
Boying Zhang1,2, Huimin Gao1, Yazhou Kang1
1College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 8, 2024
概括
新的体联网状寡合物 (CRO) 克服了对光电化学降水的共价有机框架 (COF) 的可加工性问题. 这些工程CRO使得稳定,灵活的光电极具有显著增强的光电流.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术纳米技术
背景情况:
- 联有机框架 (COF) 对光电化学减水具有前景,但处理能力差.
- 开发可加工的基于COF的材料对于可再生能源的实际应用至关重要.
研究的目的:
- 为了合成可加工的10nm以下的基于本佐醇的合合网状寡合体 (CROs).
- 为了提高光电极性能,将电子缺乏的单元设计为CRO.
- 制造和评估异质连接光电极,以实现高效的降水.
主要方法:
- 水性纳米反应器合成的合联网状寡合体 (CROs).
- 最终封闭策略是创建缺乏电子的CRO纳米晶格 (CROs-Cg).
- 使用CROs/CROs-Cg和聚合物的旋转涂层制造散装异质连接 (BHJ) 光电极.
- 使用光电流测量,DFT计算,Mott-Schottky和电荷密度差异分析进行了表征.
主要成果:
- 合成了稳定且可加工的CROs,形成了灵活光电极的"电子墨水".
- CRO-BtzTp-Cg和CRO-TtzTp-Cg扩展吸收到红外线,并改善了光寿命.
- ITO/CuI/CRO-TtzTp-Cg-HP18/SnO2/Pt光电极实现了94.9μA cm‒2的光电流,增加了47.5倍.
- DFT和实验分析显示,BHJ设备的能量障碍降低,电子亲和力增加,电荷载体密度更高,电荷转移加速.
结论:
- 工程电子缺陷CROs为COF可处理性挑战提供了可行的解决方案.
- 结合这些CRO的BHJ设备显示了显著增强的光电化学减水性能.
- 这项工作为具有成本效益的可打印能源系统可扩展生产COF纳米膜铺平了道路.
相关概念视频
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
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.
2.3K
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