作为超稳定的Pd催化酸电氧化过程中的分子电子桥梁,氧化活性
Jianding Li1,2, Jinwen Wu1, Min Li1
1Huzhou Key Laboratory of Materials for Energy Conversion and Storage, School of Science, Huzhou University, Huzhou 313000, China. jiandingli@zjhu.edu.cn.
Dalton transactions (Cambridge, England : 2003)
|November 24, 2025
概括
一种新型的Pd/C-PQ催化剂,修改了9,10-phenanthrenequinone (PQ),显著提高了酸氧化的电催化性能. 与传统的Pd/C催化剂相比,这种新的催化剂显示出更好的活性,稳定性和动力学.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 基于的催化剂 (Pd/C) 对于小型有机分子氧化反应至关重要.
- 提高Pd/C催化剂的电催化性能和稳定性仍然是一个关键的挑战.
研究的目的:
- 开发一种新的Pd/C-PQ催化剂,通过修改Pd/C与9,10-phenanthrenequinone (PQ).
- 研究PQ修饰对Pd纳米颗粒用于酸氧化的电催化活性,稳定性和动力学的影响.
主要方法:
- 在物理上将PQ吸附到Vulcan XC-72碳黑上,形成C-PQ.
- 在修改后的C-PQ支上沉积Pd纳米粒子,以创建Pd/C-PQ催化剂.
- 电化学测试,包括酸氧化和CO剥离电压测量.
主要成果:
- Pd/C-PQ表现出散的Pd纳米粒子 (2.44.6nm),比Pd/C.中更小.
- 对于Pd/C-PQ,甲酸氧化的质量和特异活性分别是Pd/C-PQ的2.67倍和2.07倍.
- Pd/C-PQ显示了CO剥离峰值 (26mV) 的负转变,表明CO吸附能力较弱,稳定性改善.
- 通过PQ观察到增强的电荷转移动力学和氧化还原调解.
结论:
- Pd/C-PQ催化剂在酸氧化过程中显著提高了电催化性能.
- 来自较小的Pd粒子大小,Pd-PQ电子相互作用和PQ的氧化还原介导的协同效应有助于增强活性和稳定性.
- 这种修改后的催化剂为涉及小有机分子的电催化应用提供了有希望的进步.
相关概念视频
Oxidation of Phenols to Quinones
4.5K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
4.5K
Redox Reactions
856
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
856
Redox Reactions
58.1K
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...
58.1K
Photochemical Electrocyclic Reactions: Stereochemistry
2.2K
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
2.2K
Oxidation and Reduction of Organic Molecules
9.1K
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...
9.1K
Role of Reduced Coenzymes NADH and FADH₂
16.1K
The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
16.1K
![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)

![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)