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Related Concept Videos

Standard Electrode Potentials03:02

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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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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Integrated Structural Modulation Inducing Fast Charge Transfer in Aqueous Zinc-Ion Batteries.

Nibagani Naresh1, Youngtae Park2, Su Hwan Jeong1

  • 1Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, 52828, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|September 2, 2024
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Summary

Researchers developed a new manganese dioxide and tin oxide nanocomposite for safer, longer-lasting aqueous zinc-ion batteries (AZIBs). This advanced material significantly improves capacity and stability during extended use.

Keywords:
aqueous zinc‐ion batterieslattice disordersynergistic effecttheoretical investigation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc-ion batteries (AZIBs) offer safe and cost-effective energy storage.
  • Manganese oxides are promising cathode materials for AZIBs but suffer from structural degradation during cycling.
  • Structural instability limits the reversible capacity and cycle life of MnO2-based cathodes.

Purpose of the Study:

  • To develop an advanced α-MnO2@SnO2 nanocomposite cathode material for AZIBs.
  • To enhance the structural stability and electrochemical performance of MnO2-based cathodes.
  • To investigate the synergistic effects of lattice disorder and improved conductivity in the nanocomposite.

Main Methods:

  • Facile hydrothermal synthesis of the α-MnO2@SnO2 nanocomposite.
  • Electrochemical characterization, including cycling performance and rate capability tests.
  • Ex situ experiments and density functional theory (DFT) calculations to analyze structural and electronic properties.

Main Results:

  • The α-MnO2@SnO2 nanocomposite achieved a high reversible capacity of 347 mAh g-1 at 100 mA g-1 after 50 cycles.
  • Excellent rate performance was demonstrated, with a capacity of 78 mAh g-1 maintained at 5 A g-1 after 1000 cycles.
  • The nanocomposite exhibited enhanced structural stability and improved ion/electron exchange kinetics.

Conclusions:

  • The developed α-MnO2@SnO2 nanocomposite effectively mitigates structural degradation in AZIB cathodes.
  • Synergistic effects enhance electrochemical performance, leading to superior capacity and cycle life.
  • The material shows great potential for advanced aqueous zinc-ion battery applications.