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Related Concept Videos

Standard Electrode Potentials03:02

Standard Electrode Potentials

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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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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Electrodeposition01:08

Electrodeposition

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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...
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Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

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Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Highly Efficient, Selective, and Stable CO2 Electroreduction on a Hexagonal Zn Catalyst.

Da Hye Won1, Hyeyoung Shin2, Jaekang Koh2

  • 1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea.

Angewandte Chemie (International Ed. in English)
|June 29, 2016
PubMed
Summary
This summary is machine-generated.

Hierarchical hexagonal zinc catalysts efficiently convert carbon dioxide (CO2) to carbon monoxide (CO) fuel. Tuning the zinc crystal structure enhances selectivity and stability for sustainable energy production.

Keywords:
carbon dioxidecarbon monoxidedensity functional calculationselectrocatalysiszinc

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalytic CO2 conversion is crucial for sustainable energy, but challenges include low activity, selectivity, and stability.
  • Developing efficient electrocatalysts for selective CO2 reduction remains a significant research area.

Purpose of the Study:

  • To investigate a hierarchical hexagonal zinc (Zn) catalyst for efficient and selective electrocatalytic CO2 conversion to CO.
  • To understand the role of crystal facets in determining product selectivity and catalytic performance.

Main Methods:

  • Synthesis of a hierarchical hexagonal Zn catalyst.
  • Electrochemical analysis of CO2 reduction reactions.
  • Density Functional Theory (DFT) calculations to study reaction mechanisms and intermediate stabilization.

Main Results:

  • The hexagonal Zn catalyst demonstrated high efficiency and stability for selective CO production from CO2.
  • Electrochemical analysis revealed that the Zn (101) facet favors CO formation, while the Zn (002) facet favors H2 evolution.
  • DFT calculations confirmed that the (101) facet lowers the reduction potential for CO2 to CO by stabilizing the COOH intermediate.

Conclusions:

  • Morphology and crystal facet engineering of Zn catalysts are key to achieving high selectivity for CO production.
  • Tuning the ratio of Zn (101) to (002) facets offers a design principle for developing advanced electrocatalysts for CO2 conversion.