在Bi负载BiVO中的共价桥4 实现快速电荷转移,以实现高效的光催化水氧化
Liyang Li1, Zhiming Chen2, Dong Fang1
1Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, P. R. China.
概括
这项研究通过加载等离子体比斯木纳米颗粒来增强比斯木瓦纳酸盐 (BiVO4) 用于光催化水氧化. 这改善了电荷载体的分离,显著提高了氧气演变速率,即使在近红外光下也是如此.
科学领域:
- 材料科学 材料科学 材料科学
- 光催化作用的光催化
- 可再生能源可再生能源是可再生能源.
背景情况:
- 木瓦纳酸盐 (BiVO4) 显示出对光催化水的氧化有希望,这对于极端环境中氧气生成至关重要.
- 一个主要的限制是光生成的电荷载体的低效分离,阻碍了整体性能.
研究的目的:
- 通过解决电荷载体分离的局限性,开发一种用于高效氧化水的增强光催化剂.
- 为了研究在BiVO4上在现场加载的等离子木纳米颗粒对改善光催化活性的作用.
主要方法:
- 在现场通过部分还原将等离子体 (Bi) 纳米颗粒加载到BiVO4上.
- 形成Bi─O─V共价桥梁以促进电子迁移.
- 使用 femtosecond 短暂吸收光谱和密度函数理论 (DFT) 计算进行了表征.
主要成果:
- 优化的Bi/BiVO4复合物表现出一个创纪录的光催化氧演化率4567.94μmolh-1g-1.1.
- 在近红外光下 (381.47 μmol h−1 g−1) 证明了显著的光催化氧化水的能力.
- 生物-O-V共价桥有效促进了等离子诱导的热电子从Bi到BiVO4的迁移.
结论:
- 开发的Bi/BiVO4材料为光催化氧生产提供了低成本,高效的解决方案.
- 这些发现支持了这种材料在需要在极端条件下产生氧气的应用中的潜力.
- 这项工作推动了先进的光催化剂的设计,用于水的分裂和氧的进化.
更多相关视频
相关概念视频
01:08Covalent Bonds
9.1K
Overview
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
9.1K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.5K
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.
2.5K
01:01Introduction to Chemical Bonds
9.9K
Chemical Bonds
The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...
The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...
9.9K
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.2K
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.
2.2K
02:32Bonding in Metals
48.2K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
48.2K
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