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Related Concept Videos

Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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Hydrogen Bonds

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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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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.
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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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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.
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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Single-atom cobalt array bound to distorted 1T MoS2 with ensemble effect for hydrogen evolution catalysis.

Kun Qi1, Xiaoqiang Cui2, Lin Gu3

  • 1State Key Laboratory of Automotive Simulation and Control, Department of Materials Science, Key Laboratory of Automobile Materials of MOE, Jilin University, Changchun, 130012, China.

Nature Communications
|November 21, 2019
PubMed
Summary
This summary is machine-generated.

Atomically dispersed cobalt catalysts on distorted molybdenum disulfide (MoS2) nanosheets exhibit platinum-like activity for the hydrogen evolution reaction (HER). This interface catalyst design overcomes challenges in metal-atom loading and support interactions for enhanced performance.

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Atomically dispersed metallic catalysts face challenges with low metal loading, localization, and support interactions, limiting catalytic performance.
  • Developing efficient single-atom catalysts requires precise control over metal-support interfaces.

Purpose of the Study:

  • To engineer an interface catalyst with high metal-atom loading density and controllable localization.
  • To investigate the role of support phase transformation in single-atom catalyst activity.
  • To achieve platinum-like activity and stability for the hydrogen evolution reaction (HER).

Main Methods:

  • Synthesis of single-atom cobalt array covalently bound to distorted 1T MoS2 nanosheets (SA Co-D 1T MoS2).
  • Induction of MoS2 phase transformation from 2H to D-1T via strain and Co-S covalent bonding.
  • Characterization using advanced techniques and density functional theory (DFT) calculations.
  • Evaluation of catalytic activity and stability for HER using active-site blocking experiments.

Main Results:

  • Achieved an atomically dispersed cobalt array on distorted 1T MoS2 (SA Co-D 1T MoS2).
  • Demonstrated Pt-like activity and high long-term stability for the hydrogen evolution reaction (HER).
  • DFT calculations and experiments revealed synergistic effects between Co adatoms and the D-1T MoS2 support.

Conclusions:

  • The phase transformation of MoS2 to D-1T is crucial for forming highly active single-atom array catalysts.
  • The interface catalyst exhibits superior HER performance due to an ensemble effect and tuned hydrogen binding.
  • This work provides a new strategy for designing high-performance single-atom catalysts.