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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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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...
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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.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
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Updated: Mar 13, 2026

Improved Heterojunction Quality in Cu2O-based Solar Cells Through the Optimization of Atmospheric Pressure Spatial Atomic Layer Deposited Zn1-xMgxO
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Reactivity at the Cu2O(100):Cu-H2O interface: a combined DFT and PES study.

J H Stenlid1, M Soldemo2, A J Johansson3

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Physical Chemistry Chemical Physics : PCCP
|October 28, 2016
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Water adsorption on copper(I) oxide (Cu2O) surfaces leads to a stable hydroxyl (OH) layer, independent of water coverage. This interaction also reconstructs the Cu2O surface to an unreconstructed (1x1) structure.

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Area of Science:

  • Surface Science
  • Materials Chemistry
  • Computational Materials Science

Background:

  • The water-cuprite interface is crucial for surface properties of copper oxides.
  • Understanding water interactions on Cu2O is vital for copper and its oxides under operational conditions.

Purpose of the Study:

  • To investigate water interactions and reactions on a Cu2O(100):Cu surface.
  • To elucidate the water-oxide interplay at the interface.

Main Methods:

  • High-resolution photoelectron spectroscopy (PES).
  • Density functional theory (DFT) calculations, including PBE-D3+U, PBE, PBE-D3, and HSE06-D3.
  • Studied up to bilayer water coverage.

Main Results:

  • Both experimental and computational results confirm a thermodynamically favored surface OH coverage of 0.25-0.5 ML, independent of H2O coverage.
  • This OH coverage is higher than previously reported values.
  • Water adsorption lifts the initial (3,0;1,1) surface reconstruction, forming an unreconstructed (1x1) Cu2O(100) structure.
  • Results are consistent with ambient temperatures under wet/humid and oxygen-lean conditions.

Conclusions:

  • A stable hydroxyl layer forms on Cu2O(100) surfaces upon water adsorption.
  • Water adsorption induces a surface reconstruction to a (1x1) phase.
  • The findings provide detailed insights into water-cuprite interface chemistry.