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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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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...
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Crystal Field Theory
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Tetrahedral Complexes
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Enhancing Zn2+ Storage Performance by Constructing the Interfaces Between VO2 and Co-N-C Layers.

Guo-Qiang Yuan1, Xing Wei2, Yi-Chun Su1

  • 1School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225009, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 19, 2023
PubMed
Summary

This study enhances aqueous zinc-ion battery cathodes using cobalt-nitrogen-carbon coated vanadium dioxide nanobelts. This novel coating improves ion diffusion and stability, boosting battery performance.

Keywords:
Co‐N‐C layercathodeenergy storage mechanismssingle‐atom carbon coated VO2 nanobeltszinc‐ions batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Vanadium oxides are promising cathode materials for aqueous zinc-ion batteries (AZIBs) due to cost and safety.
  • Challenges include low ion diffusion and vanadium dissolution, leading to capacity decay and poor cycling stability.

Purpose of the Study:

  • To develop enhanced cathode materials for AZIBs by addressing the limitations of vanadium oxides.
  • To improve the electrochemical performance and long-term stability of AZIBs.

Main Methods:

  • Synthesis of vanadium dioxide (VO2) nanobelts coated with a single-atom cobalt dispersed N-doped carbon (Co-N-C) layer via calcination.
  • Characterization using various in-/ex situ techniques.
  • Density functional theory (DFT) simulations to investigate interfacial mechanisms.

Main Results:

  • The Co-N-C coating protects VO2 nanobelts, enhances ion diffusion, and improves Zn2+ storage.
  • Co-O-V bonds at the interface facilitate interfacial Zn2+ storage.
  • Achieved ultrahigh capacity (418.7 mAh g-1 at 1 A g-1), excellent long-term stability (>8000 cycles at 20 A g-1), and superior rate performance.

Conclusions:

  • The VO2@Co-N-C nanobelts represent a highly effective cathode material for AZIBs.
  • The developed strategy offers a pathway for designing advanced energy storage materials.