高密度单原子催化剂用于增强氧气演化反应
Pawan Kumar1, Karthick Kannimuthu1, Ali Shayesteh Zeraati1
1Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, Canada.
Journal of the American Chemical Society
|March 30, 2023
概括
我们开发了一种使用宏分子制造高密度单原子催化剂的新方法. 这显著改善了富含的碳网络中的单个原子的氧化演化反应 (OER) 性能和稳定性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 单原子催化剂 (SAC) 具有独特的特性,但面临着低负荷和不稳定性等挑战.
- 优化金属支相互作用对于提高SAC性能至关重要.
研究的目的:
- 开发高密度单原子催化剂的宏分子辅助合成方法.
- 研究这些SACs在氧化演化反应 (OER) 中增强的电催化活性和稳定性.
主要方法:
- 在酸丰富的石墨烯网络上对单个原子 (Co SAC) 的宏分子辅助合成.
- 在1M KOH中进行OER电催化试验.
- 操作X射线吸收接近边缘结构 (XANES) 光谱.
- 密度函数理论 (DFT) 的计算.
主要成果:
- 在多孔碳网中达到高密度的Co SAC负载 (10.6 wt %) (表面积约为186 m2g-1).
- 显著增强了OER性能 (η10在351mV;质量活性为2209mA mgCo-1在1.65V),稳定时间超过300小时.
- 运行XANES发现了缺电子的Co-O中间体,DFT证实了容易的电子转移加速OER动力学.
结论:
- 大分子辅助策略有效地产生具有改善催化性能的高密度SAC.
- 开发的Co SAC显示出高效和稳定的电催化OER的巨大潜力.
- 了解电子结构和反应中间体是设计先进催化剂的关键.
相关概念视频
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.6K
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.
10.6K
Catalysis
27.2K
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.
27.2K
Oxidation-Reduction Reactions
65.3K
Oxidation–Reduction Reactions
65.3K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
12.2K
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
12.2K
Oxidative Cleavage of Alkenes: Ozonolysis
10.7K
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.
10.7K
Reduction of Alkenes: Catalytic Hydrogenation
12.3K
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...
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...
12.3K


