动态双中心合协同催化剂,用于高效的氧气减排
Jingjing Jiang1, Jiulong Wu1, Chenyu Yang1
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, China.
Angewandte Chemie (International ed. in English)
|June 21, 2025
概括
设计的双中心催化剂通过控制中间路径来加速氧降解反应 (ORR). 这一突破增强了ORR动力学,并使稳定的空气电池成为可能.
科学领域:
- 不同质的催化剂.
- 电触媒溶解是一种电触媒.
- 材料科学是一种材料科学.
背景情况:
- 氧降解反应 (ORR) 在动力学上受到中间吸附和竞争路径的限制.
- 传统的催化剂难以同时控制O-O键裂变和过氧化 (H2O2) 脱吸.
- 不同的反应路径导致低效的4e或2e路径,阻碍ORR性能.
研究的目的:
- 通过开发一种新的催化机制来克服ORR的动力限制.
- 设计能够实现动态双中心合协同 (DCCS) 的二元组件接口.
- 通过分子调度反应路径建立异质催化物的新设计原则.
主要方法:
- 精确设计的PdRh-Pt纳米板二元组件接口的制造.
- 多维in situ同步子辐射光谱检测反应中间体和路径.
- 理论研究 (例如,DFT) 以阐明DCCS的催化机制和动力学.
主要成果:
- DCCS机制主要发生在PdRh部位,激活4e-通路.
- Pt中心有助于选择性减少*OOH到*O和H2O2,而PdRh站点则促进H2O2的迁移和解离.
- 与商业Pt/C相比,换频率增加了六倍,同时Zn-air电池具有200小时的稳定性.
结论:
- 设计的PdRh-Pt接口使DCCS催化成为可能,将分离的路径重定向到单一的4e-主导路径.
- 接口动力协同有效地打破了ORR中的动力学权衡,提高了催化效率.
- 这项研究提出了先进催化剂的新设计原则,通过控制分子水平的反应途径来实现.
更多相关视频
10:21Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
8.5K
10:57Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
18.4K
相关概念视频
01:23Redox Equilibria: Overview
1.1K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
1.1K
03:11Oxidation-Reduction Reactions
66.0K
Oxidation–Reduction Reactions
66.0K
01:24Redox Reactions
56.5K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
56.5K
01:19Oxidation and Reduction of Organic Molecules
7.8K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
7.8K
01:46Oxidative Cleavage of Alkenes: Ozonolysis
11.2K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
11.2K
01:19Phase I Oxidative Reactions: Overview
388
Phase I biotransformation, or functionalization, is a crucial chemical process that converts drugs and other xenobiotics into more water-soluble forms, facilitating expulsion from the body. It involves oxidative, reductive, and hydrolytic reactions that add or unveil polar functional groups on lipophilic substrates. Key players in phase I reactions are the mixed-function oxidases. Situated in liver cell microsomes, these enzymes predominantly carry out drug metabolism. They require molecular...
388