相关实验视频

Updated: Jun 3, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

通过选择性蚀刻和金属原子的顺序吸附来准二原子催化剂的合成

Xiangrong Jin¹, Mengyao Chang¹, Hao Sun¹

¹State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China.

Journal of the American Chemical Society

|January 8, 2025

概括

研究人员开发了一种新方法,通过精确地放置金属原子来制造高级二原子催化剂. 这种技术增强了氧降解反应,为清洁能源技术提供了有前途的途径.

科学领域:

材料科学
催化剂
电化学

背景情况:

二原子催化剂为各种反应提供可调节的结构和协同效应.
具有特定配置和多种金属组合的二原子催化剂的精确构造仍然是一个挑战.

研究的目的:

开发一种针对特定配置的二原子位点的新策略.
研究这些新型二原子催化剂在氧降解反应中的性能.

主要方法:

采用了选择性蚀刻和金属离子吸附策略.
用过氧化选择性地在单个原子位点 (M1-N4) 附近蚀刻特定的碳原子 (α-C).
由此产生的空位被用来捕获第二个金属离子 (M2),形成二原子位点 (M1-M2-N4).

主要成果:

拟议的战略成功地构建了各种二原子位点,包括Fe-Pd,Fe-Pt,Fe-Ru,Fe-Zn,Co-Fe,Co-Ni和Co-Cu.
与单原子催化剂相比,这些二原子催化剂表现出优化的电子结构.
代表性的Fe-Pd-NC和Co-Fe-NC催化剂表现出优异的氧降解反应活性,其半波电位分别为0.92V和0.91V.

结论:

在单原子催化剂中选择性蚀刻α-C代表了合成二原子位点的新后处理策略.
这种方法可以精确控制二原子催化剂的配置和组成.
开发的二原子催化剂显示出电催化应用的巨大潜力,特别是氧降解反应.

更多相关视频

In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions

In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions

Published on: June 16, 2014

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

相关概念视频

Catalysis

Catalysis

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.

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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.