电子转移到电子积累的纳米晶体:模拟多电子光催化II中的中间事件
Junhui Wang1, Tao Ding1, Kaifeng Wu1
1State Key Laboratory of Molecular Reaction Dynamics and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023 , China.
在纳米催化剂中存在的电子阻碍了光催化反应. 这项研究表明,量子点中的电子兴奋剂减缓了电子转移并加速了电荷重组,从而降低了多电子过程的整体效率.
科学领域:
- 光催化
- 材料科学
- 量子点研究
背景情况:
- 多电子光催化反应的效率通常低于初始电荷分离.
- 之前的研究发现,轻型收割机的电荷转移 (CT) 是其中的一个因素.
- 电荷转移到纳米催化剂是另一个潜在的效率瓶.
研究的目的:
- 研究电荷积累的纳米催化剂对光催化效率的影响.
- 使用合纳米晶体量子点 (QD) 模拟累积电荷的纳米催化剂.
- 量化事先存在的电子对电子转移 (ET) 和电荷重组 (CR) 的影响.
主要方法:
- 使用电子合量子点 (QD) 制造模型系统.
- 使用过渡吸收光谱来监测电子转移动态.
- 在中性和化QD样本中比较ET和CR率.
主要成果:
- 在QD中预先存在的电子显著减缓了电子转移 (ET) 从37.8±2.2 psi到93.4±8.6 psi.
- 化QD加速电荷重组 (CR),使寿命从7.02 ± 0.84 ns减少到3.69 ± 0.25 ns.
- 在现有电子的存在下,电子注入产量减少了约14%.
结论:
- 电荷转移到电荷积累的纳米催化剂是一个显著的中间事件,降低了光催化效率.
- 在纳米催化剂中存在多余的电子阻碍了电子注入,并促进了电荷重组.
- 这些发现为优化多电子光催化系统提供了关键的见解.
更多相关视频
08:44Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
Published on: August 22, 2017
15:39Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm
Published on: February 28, 2017
相关概念视频
Electron Configuration of Multielectron Atoms
Ionic Bonding and Electron Transfer
Electron Transport Chains
The ETC is comprised of...
Electron Carriers
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
Electron Affinity
Electron Behavior
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
