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Related Concept Videos

Standard Electrode Potentials03:02

Standard Electrode Potentials

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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 battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
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Spontaneous Chemical Reactions
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Updated: Aug 31, 2025

Zinc-Sponge Battery Electrodes that Suppress Dendrites
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High performance aqueous zinc battery enabled by potassium ion stabilization.

Yi Liu1, Ying Liu1, Xiang Wu1

  • 1School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, PR China.

Journal of Colloid and Interface Science
|August 19, 2022
PubMed
Summary

This study enhances aqueous zinc ion batteries (AZIBs) by using K+ intercalation in V2O5 nanolayers. This method improves durability and capacity, addressing key limitations in energy storage systems.

Keywords:
Electrode materialsNanobeltsPre-intercalationVanadium oxideZinc ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc ion batteries (AZIBs) offer safety and environmental benefits but suffer from slow Zn2+ diffusion and poor cathode stability.
  • Limited cycle life and capacity retention hinder the practical application of AZIBs.

Purpose of the Study:

  • To develop a highly durable AZIB by enhancing the cathode material.
  • To improve the electrochemical performance and cycling stability of V2O5-based cathodes.

Main Methods:

  • K+ ions were intercalated into V2O5 nanolayers to create a composite cathode material.
  • Electrochemical performance, including capacity, rate capability, and cycling stability, was evaluated.
  • The structural role of K+ as a 'pillar' to stabilize V2O5 was investigated.

Main Results:

  • The K+-intercalated V2O5 cathode delivered a high reversible capacity of 479.8 mAh g-1 at 0.2 A g-1.
  • Excellent cyclic stability was achieved, retaining 91.3% of capacity after 3000 cycles at 10 A g-1.
  • The K+ ions effectively buffered lattice expansion and prevented structural collapse, enhancing durability.

Conclusions:

  • K+ pre-intercalation is a promising strategy to overcome the limitations of V2O5 cathodes in AZIBs.
  • The developed AZIB demonstrates superior durability, capacity, and stability, paving the way for advanced energy storage solutions.
  • The findings highlight the potential of ion intercalation for designing high-performance battery materials.