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Related Concept Videos

Bonding in Metals02:32

Bonding in Metals

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”.
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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Updated: May 24, 2026

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
08:40

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Rediscovering cobalt's surface chemistry.

Emily A Lewis1, April D Jewell, Georgios Kyriakou

  • 1Tufts University, Department of Chemistry, Medford, MA 02155, USA.

Physical Chemistry Chemical Physics : PCCP
|March 6, 2012
PubMed
Summary
This summary is machine-generated.

Cobalt nanoparticles on metal substrates are crucial for catalysis. Advanced microscopy reveals their atomic properties, aiding the study of surface chemistry for industrial applications.

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Area of Science:

  • Surface science
  • Catalysis
  • Materials science

Background:

  • Cobalt (Co) is vital for industrial catalysis but its surface chemistry is understudied.
  • Difficulties in preparing stable single crystals hinder Co surface research.
  • Metal-supported Co nanoparticles offer a model system for atomic-scale studies.

Purpose of the Study:

  • To review the current understanding of metal-supported Co nanoparticles.
  • To explore the adsorption and reaction of molecules on Co nanoparticles.
  • To highlight the potential of these systems for investigating Co surface chemistry.

Main Methods:

  • Scanning probe microscopy (SPM) for atomic-scale characterization.
  • High-resolution scanning tunneling microscopy (STM) for detailed imaging.
  • Synthesis of well-defined Co nanoparticles on metal substrates.

Main Results:

  • SPM enables atomic-scale study of Co nanoparticle structure, electronic, and magnetic properties.
  • Metal-supported Co nanoparticles facilitate investigation of adsorption, diffusion, and dissociation of molecules.
  • New STM data illustrate unique properties of these complex catalytic systems.

Conclusions:

  • Metal-supported Co nanoparticles are promising platforms for fundamental surface chemistry research.
  • Further studies can elucidate Co's catalytic mechanisms and optimize industrial processes.
  • Advanced microscopy techniques are key to unlocking the potential of Co-based catalysts.