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Related Concept Videos

Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

247
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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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Related Experiment Video

Updated: Jul 4, 2025

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Generating active metal/oxide reverse interfaces through coordinated migration of single atoms.

Lina Zhang1,2, Shaolong Wan1, Congcong Du1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry & Chemical Engineering, Xiamen University, Xiamen, 361005, China.

Nature Communications
|February 9, 2024
PubMed
Summary
This summary is machine-generated.

Researchers discovered new active sites in catalytic materials. Metal/oxide reverse interfaces, formed by atom migration, significantly enhance catalyst reactivity for applications like formaldehyde oxidation.

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Area of Science:

  • Heterogeneous catalysis
  • Materials science
  • Surface chemistry

Background:

  • Identifying active sites is crucial for designing highly reactive catalysts.
  • Conventional active sites include single atoms, nanoparticles, and metal/oxide interfaces.

Purpose of the Study:

  • To investigate metal/oxide reverse interfaces as novel active sites in heterogeneous catalysts.
  • To demonstrate the formation and catalytic activity of these reverse interfaces.

Main Methods:

  • Preparation of a palladium single-atom catalyst on ceria (Pd1/CeO2) using atom trapping.
  • Steam treatment of the catalyst to induce coordinated atom migration.
  • Characterization of the catalyst before and after treatment.
  • Testing catalytic activity for formaldehyde oxidation.

Main Results:

  • The Pd1/CeO2 catalyst, initially inactive at 30°C, completely oxidized formaldehyde after steam treatment.
  • Steam treatment induced coordinated migration of cerium and palladium atoms, forming a Ce2O3-Pd nanoparticle domain interface.
  • This newly formed metal oxide-metal interface was responsible for the enhanced catalytic activity.

Conclusions:

  • Metal/oxide reverse interfaces, formed by coordinated atom migration, represent a new class of active sites.
  • This discovery expands the understanding of active site formation in heterogeneous catalysis.
  • Metal single-atom materials can serve as precursors for generating these novel active interfaces.