共催化剂的存在形式和二氧化碳化物的光催化演变之间的相关性
Mianmian Zhai1, Yu Zhang1, Jixiang Xu1
1Key Laboratory of Eco-chemical Engineering, Taishan Scholar Advantage and Characteristic Discipline Team of Eco-Chemical Process and Technology, Qingdao University of Science and Technology, Qingdao 266042, China; College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
碳化物 (CN) 上的单原子 (SA) 和纳米粒子 (NP) 的 (Ru) 增强光催化 (H2) 进化. 在CN上Ru集群+NP显示了最高的H2演化率,改善了催化剂设计.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 摄影化学的使用.
背景情况:
- 单原子 (SA) 和纳米集群催化剂以电催化水分裂而闻名.
- 它们在光催化 (H2) 进化中的作用仍然不太被探索.
- 碳化物 (CN) 是光催化的一个有前途的材料.
研究的目的:
- 调查 (Ru) 协催化剂形式 (SA,集群,纳米粒子) 对碳化物 (CN) 的光催化H2进化活性的影响.
- 了解Ru含量,其各种形式和H2演化速率之间的相关性.
- 为设计高效的催化剂提供见解,以提高H2的生产.
主要方法:
- 用不同的形式 (SA + 集群,集群 + NP,NP) 使用浸和烧焦来制备装饰着Ru催化剂的CN.
- 合成材料的特性.
- 光催化水分裂试验用于测量H2演变速率.
- 理论计算 (例如,DFT) 来理解反应机制.
主要成果:
- 纳米粒子 (NP) 有利于水分子吸附.
- 单个Ru原子 (SAs) 和集群可促进H2的脱吸.
- 理论计算表明Ru集群+NP对H*中间形成有利.
- 一个1.07%重量的Ru NPs+集群修改CN表现出最高的H2演化率 (13.64 mmol h-1 g-1).
- 这一比例明显高于未经修改的CN和CN与RuNP.
结论:
- Ru共催化剂的形式 (SA,集群,NP) 极大地影响了CN的光催化H2进化活性.
- 在CN上Ru集群和NP之间的协同效应增强了H2进化.
- 这项研究为设计用于高效光催化水分裂和H2生产的先进催化剂提供了宝贵的指导.
更多相关视频
12:19Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
Published on: November 29, 2018
10:39Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
Published on: August 23, 2018
相关概念视频
Catalysis
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
