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Related Concept Videos

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The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Crystal Field Theory
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Inductive Effect on Single-Atom Sites.

Chang-Xin Zhao1, Xinyan Liu2, Jia-Ning Liu1

  • 1Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.

Journal of the American Chemical Society
|December 6, 2023
PubMed
Summary
This summary is machine-generated.

Researchers found that reducing the distance between heteroatom dopants and single-atom sites enhances electrocatalytic activity for the oxygen reduction reaction (ORR). This discovery optimizes catalysts for applications like zinc-air batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Single-atom catalysts (SACs) offer high electrocatalytic activity.
  • Heteroatom doping can further enhance SAC performance.
  • The precise influence of doping positions on activity is not fully understood.

Purpose of the Study:

  • To investigate the relationship between heteroatom doping positions and electrocatalytic activity.
  • To elucidate the inductive effect of single-atom sites.
  • To develop a synthesis strategy for optimizing SACs for the oxygen reduction reaction (ORR).

Main Methods:

  • Proposed a synthesis strategy using ligand modification to control the distance between dopants and single-atom sites.
  • Fabricated Fe-N3P1 single-atom sites.
  • Evaluated electrocatalytic activity for the ORR.

Main Results:

  • Demonstrated that reducing the spatial gap between doped heteroatoms and single-atom sites enhances ORR activity.
  • Achieved optimized electrocatalytic performance with the precisely synthesized Fe-N3P1 SAC.
  • The new catalyst exhibits remarkable ORR activity.

Conclusions:

  • The inductive effect of single-atom sites is crucial for ORR activity.
  • Precise control over dopant-single-atom site distance is key to optimizing SACs.
  • The developed Fe-N3P1 SAC shows significant potential for energy storage and conversion devices like zinc-air batteries and fuel cells.