用氧气插入的表面层促进性氧化电催化
Yana Men1, Xiaozhi Su2, Peng Li1
1College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.
Journal of the American Chemical Society
|June 22, 2022
概括
表面氧气插入优化催化剂的性氧化反应 (HOR). 这种策略显著提高了性能,实现了40倍的质量活动,使HOR电催化剂更具竞争力.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 优化电催化剂电子结构对于高效的氧化反应 (HOR) 是至关重要的.
- 基于的催化剂是类金属的有希望的替代品,但需要提高性能.
- 现有的Ni催化剂缺乏广泛应用所需的实际竞争力.
研究的目的:
- 开发一种策略,精确地定制Ni电催化剂的电子结构.
- 为了获得最佳的氧结合能量 (OHBE),以提高性HOR性能.
- 研究表面氧气插入在调节Ni催化剂电子特性中的作用.
主要方法:
- 使用分子轨道理论和Hammer-Nørskov d-band模型来指导催化剂设计.
- 使用通过金属有机框架介导的低温热解的表面氧气插入策略.
- 描述了由氧插入的Ni催化剂 (Ni@Oi-Ni),并评估了其性HOR活性.
主要成果:
- 性HOR的Ni@Oi-Ni催化剂的质量活性为85.63mA mg-1,比原始Ni的质量提高了40倍.
- 氧气插入优化了电子结构,改善了能量水平对齐,减少了抗结合填充,从而实现了最佳的OHBE.
- 发现OHBE与氧含量之间的线性相关性,以及OH结合强度与HOR活性之间的火山类相关性.
结论:
- 表面氧气插入是调整Ni催化剂电子结构和协调环境的有效策略.
- 通过氧气插入实现的优化OH结合强度对于高性HOR活性至关重要.
- 这种方法为氧化反应提供了高效和竞争力的Ni基电催化剂的途径.
相关概念视频
Electrodeposition
705
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
705
Batteries and Fuel Cells
27.9K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
27.9K


