光电极活性材料的计算机指导设计,用于光辅助储能
Chengfei Qian1,2, Ronghao Wang1,2, Hao Shen1,2
1Institute of Advanced Materials and Flexible Electronics (IAMFE), School of Chemistry and Materials Science, Nanjing University of Information Science and Technology, 219 Ninliu Road, Nanjing, 210044, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|July 24, 2023
概括
本研究使用密度函数理论 (DFT) 来研究用于太阳能系统的金属氧化物. Fe2CoO4显示出有希望的光电化学特性,验证了DFT的有效性.
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
- 计算化学计算化学
背景情况:
- 高效的太阳能利用和储存至关重要.
- 照明下的光电极的光电化学机制需要进一步澄清.
- 密度函数理论 (DFT) 为分析光电化学过程提供了一个强大的框架.
研究的目的:
- 通过使用高通量DFT计算,研究四种金属氧化物配置作为光电极材料的可行性.
- 阐明电子结构与光电化学性能之间的关系.
- 为设计集成光电极材料提供一种一般方法.
主要方法:
- 基于密度函数理论 (DFT) 的高通量计算.
- 计算带结构和状态密度的计算.
- 模拟与吸附配置的介质/脱介质过程.
- 对DFT预测进行实验验证.
主要成果:
- 与Co3O4 (2.553 eV) 相比,Fe2CoO4具有更窄的带间隙 (2.404 eV) 和更强的吸附能量 (-3.293 eV).
- DFT预测的电子结构与实验光电化学性能相关.
- Fe2CoO4光电极在照明下比在黑暗中 (94.9%) 显示出更高的coulombic效率 (97.4%).
结论:
- DFT是理解光电化学机制和设计光电极材料的强大工具.
- 由于其有利的电子和光电化学特性,Fe2CoO4是集成光电系统的一个有前途的材料.
- 这项研究提供了关于调整多功能材料光辅助性能的见解.
相关概念视频
01:34The Z-Scheme of Electron Transport in Photosynthesis
10.3K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
10.3K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.9K
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
1.9K
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