通过丰富的氧气空隙为氧气进化反应重建异构接口电子结构
Tongfei Li1, Luping Zhang1, Jiabo Wang1
1College of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China.
Inorganic chemistry
|June 20, 2023
概括
有氧空缺的工程孔隙NiO/ln2O3纳米纤维显著提高氧演化反应 (OER) 催化. 这一进步为可再生能源系统提供了高效,稳定和廉价的电催化剂.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 氧进化反应 (OER) 对可再生能源技术至关重要,但受到缓慢的动力学限制.
- 非贵金属电催化剂在OER中很受欢迎,但它们的内在活性需要改进.
- 氧空缺工程是提高OER催化剂性能的一个有前途的策略.
研究的目的:
- 为氧化演化反应 (OER) 开发高性能非贵金属电催化剂.
- 研究氧气空缺在增强OER的NiO/ln2O3纳米纤维的催化活性和机制中的作用.
主要方法:
- 使用简单的策略制造氧气空位丰富的多孔NiO/ln2O3纳米纤维 (Vo-NiO/ln2O3@NFs).
- 利用理论计算 (例如,DFT) 和实验技术 (例如,现场拉曼光谱) 来探测催化剂的电子结构和反应机制.
- 在性介质中评估了OER的电催化性能.
主要成果:
- 合成的Vo-NiO/ln2O3@NFs表现出丰富的氧气空缺,这调节了电子配置和中间吸附.
- 氧气空缺将d频段中心向上移,增加电导率,并增强OER动力学.
- 催化剂表现出极好的OER活性,在10 mA cm-2时具有230 mV的低超电位,以及卓越的稳定性.
结论:
- 在NiO/ln2O3纳米纤维中氧气空缺工程是一种有效的方法来提高OER性能.
- 该研究提供了对氧空位增强的OER催化机制的基本见解.
- 这项工作为通过电子结构调制设计高效且具有成本效益的OER催化剂铺平了道路.
相关概念视频
Interfacial Electrochemical Methods: Overview
289
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
289
Oxygenic Photosynthesis
47
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
47
Oxidative Cleavage of Alkenes: Ozonolysis
10.6K
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.
10.6K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.4K
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.
2.4K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.4K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.4K
Redox Equilibria: Overview
598
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...
598


