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Related Concept Videos

Reduction of Alkenes: Catalytic Hydrogenation02:13

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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.
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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Pushing the Performance Limit of Cu/CeO2 Catalyst in CO2 Electroreduction: A Cluster Model Study for Loading Single

Yawen Jiang1,2, Keke Mao3, Jiawei Li1

  • 1Hefei National Research Center for Physical Sciences at the Microscale, School of Chemistry and Materials Science, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui230026, China.

ACS Nano
|January 30, 2023
PubMed
Summary

This study introduces a novel single-atom catalyst using copper on cerium oxide clusters for efficient carbon dioxide electroreduction. The optimized catalyst demonstrates high performance and stability for methane production.

Keywords:
CO2 electroreductionCeO2 clustermethanesingle-atom catalystsupported catalyst

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Single-atom catalysts offer high efficiency for CO2 electroreduction but face challenges with loading and stability.
  • Developing a suitable model system is crucial for optimizing single-atom catalyst design.
  • Cerium oxide (CeO2) clusters present a promising support material due to their high surface-to-volume ratio.

Purpose of the Study:

  • To establish a model system for loading single copper (Cu) atoms onto ultrasmall CeO2 clusters.
  • To determine the optimal configuration of Cu single atoms on CeO2 for enhanced CO2 electroreduction.
  • To investigate the performance limits and stability of the developed single-atom catalyst.

Main Methods:

  • Synthesis of ultrasmall CeO2 clusters (2.4 nm) with atomic precision.
  • Loading of single Cu atoms onto the CeO2 cluster support.
  • Characterization using multiple techniques and theoretical calculations to identify loading sites and limits.
  • Electrochemical testing for CO2 electroreduction to methane (CH4).

Main Results:

  • An optimal configuration for Cu single atoms on CeO2 clusters was identified.
  • The optimized catalyst achieved a maximum Faradaic efficiency (FE) of 67% for CH4 production.
  • High CH4 FE (>50%) was maintained across a broad range of current densities (-50 to -600 mA/cm2).

Conclusions:

  • Ultrasmall CeO2 clusters serve as an effective model system for loading single Cu atoms.
  • The developed single-atom catalyst significantly enhances CO2 electroreduction performance for CH4 generation.
  • This work provides a pathway for designing high-performance single-atom catalysts for practical CO2 utilization.