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Photochemical Electrocyclic Reactions: Stereochemistry

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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

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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

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Stacking Engineering: A Boosting Strategy for 2D Photocatalysts.

Jinfeng Zhao¹, Yanliang Zhao¹, Huijie He¹

¹Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao 266237, China.

The Journal of Physical Chemistry Letters

|October 13, 2021

Summary

This summary is machine-generated.

Stacking engineering in two-dimensional (2D) photocatalysts creates electric polarization, boosting charge carrier separation and solar energy conversion. This method enhances photocatalyst performance for applications like water splitting.

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Area of Science:

Materials Science
Chemistry
Physics

Background:

Two-dimensional (2D) photocatalytic materials are crucial for solar energy conversion and storage.
Fast photogenerated electron-hole recombination limits the commercial application of 2D photocatalysts.

Purpose of the Study:

To propose a general paradigm to enhance charge carrier separation in 2D photocatalysts.
To investigate the role of stacking engineering and electric polarization in MoSi2N4 for improved photocatalysis.

Main Methods:

First-principles calculations were employed to study the electronic properties of 2D materials.
The effects of interlayer stacking and vertical strain on photocatalyst performance were analyzed.

Main Results:

Specific interlayer stacking induces electric polarization, which alters electronic properties and suppresses charge carrier recombination.
Vertical strain offers an additional method to control the catalytic performance of 2D photocatalysts.
MoSi2N4 was used as an example to demonstrate the effectiveness of stacking engineering.

Conclusions:

Stacking-induced electric polarization is a key factor in improving 2D photocatalyst efficiency.
This study offers new strategies for designing and applying advanced 2D photocatalysts for solar energy conversion.