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相关概念视频

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

117
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
117

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In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions
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通过电化学潜在窗口策略构建高负载单原子/集群催化剂

Jin-Cheng Liu1, Hai Xiao1, Jun Li1,2

  • 1Department of Chemistry , Tsinghua University , Beijing 100084 , China.

Journal of the American Chemical Society
|January 30, 2020
PubMed
概括

研究人员开发了一种新的电化学方法来生产高纯度单原子催化剂 (SAC) 和单催化剂 (SCC). 这种策略通过选择性地去除聚合物来净化催化剂,从而实现更广泛的工业应用.

科学领域:

  • 不同质的催化
  • 材料科学
  • 电化学

背景情况:

  • 单原子催化剂 (SAC) 和单催化剂 (SCC) 是异质催化中的先进材料.
  • 这些催化剂具有卓越的活性,选择性,稳定性和原子效率.
  • 目前生产高负载和高纯度SAC/SCC的局限性阻碍了工业采用.

研究的目的:

  • 为生产高负载和高纯度的SAC和SCC制定一个通用和有效的战略.
  • 通过改进的生产方法使SAC和SCC的工业应用成为可能.

主要方法:

  • 使用电化学电位窗口 (EcPW) 进行催化剂净化.
  • 预测并应用EcPW来选择性地从基板中出金属聚合物.
  • 通过计算模型展示策略.

主要成果:

  • 在N-化石墨烯和Fe2O3上成功建模了Pt,Pd和Ni SAC.
  • 在 graphdiyne 上成功建模了 Pt3 和 Ni3 SCC.
  • 对生产高纯度SAC和SCC的EcPW战略进行验证.

结论:

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  • 提出的电化学策略对于生产高纯度的SAC和SCC是有效的.
  • 这种方法克服了SAC/SCC生产的现有局限性,为工业用途铺平了道路.
  • 该方法是通用的,适用于各种金属-SAC/SCC和基板组合.