相关实验视频

Updated: Jan 8, 2026

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

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

Published on: October 5, 2019

转移工程 Pt 单原子/集群协同作用促进光催化进化的共价有机框架

Hanxi Li^1,2, Zhendong Luo^1,3, Jianyu Han¹

¹State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China.

Angewandte Chemie (International ed. in English)

|December 17, 2025

概括

设计异构共价有机框架 (COFs) 精确地定 (Pt) 催化剂. 由于协同的双活性位点,因胺结合的COF显著增强光催化演化 (PHE) 活性.

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:

将金属催化剂精确地固定在支点上对于优化性能至关重要,但由于表面异质性,仍然具有挑战性.
当地协调环境对催化剂分散和光催化活性的影响尚未完全理解.

研究的目的:

为精确的金属催化剂固定设计具有受控点的异构共价有机框架 (COF).
调查不同点对 (Pt) 催化剂分散和光催化演化 (PHE) 性能的影响.

主要方法:

合成四个具有相同拓但具有不同的N位的同位素COF (imine与alkene链接).
在合成的COF上固定 (Pt).
光催化演化 (PHE) 活动测试和明显量子效率 (AQE) 测量.
多种模式的表征 (例如,光谱,显微镜) 来分析催化剂的物种和电子结构.
密度函数理论 (DFT) 计算以阐明吸附能,电子分散和反应机制.

主要成果:

与基结合的对应物相比,因胺结合的COF显示出明显更高的Pt分散和更高的PHE活性,记录率为26.72 mmol h−1 g−1.1.
基于伊米因的最佳COF-Pt催化剂在420nm时实现了12.1%的表面量子效率 (AQE).
鉴定结果显示,因胺COF稳定双活性Pt位点 (Pt2+和金属集群),而基COF主要是Pt单个原子的宿主.
在Pt集群和imine COF中孤立的原子之间的协同电荷转移增强了质子吸附和还原动力学.

结论:

在COF中,宪法性异构提供了一个强大的平台,可以将位的几何学与化学成分脱,从而能够精确地控制催化剂的固定.
通过优化电荷转移和反应动力学,因米因结合的COF中的双活性位点策略显著提高了光催化性能.
本研究提供了开发高效和稳定的原子精度光催化剂支的基本设计原则,用于生产等应用.

关键词:

共价有机框架是共价有机框架.的进化是因为的进化.光催化作用的光催化金金是什么意思一个原子的催化剂.

更多相关视频

Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications

Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications

Published on: July 25, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

相关概念视频

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called 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 Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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...

Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

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.

Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
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.

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...