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Related Concept Videos

Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
Ion-Exchange Chromatography01:09

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Complexation Equilibria: The Chelate Effect01:19

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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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Published on: March 24, 2018

Chelating ionic liquids for reversible zinc electrochemistry.

Mega Kar1, Bjorn Winther-Jensen, Maria Forsyth

  • 1Australian Centre for Electromaterials Science (ACES), School of Chemistry, Monash University, Clayton 3800, Victoria, Australia. mega.kar@monash.edu

Physical Chemistry Chemical Physics : PCCP
|April 6, 2013
PubMed
Summary

Novel chelating ionic liquids were synthesized for zinc-air batteries. These ionic liquids enhance zinc ion solubility and conductivity, enabling efficient zinc deposition and stripping for improved energy storage.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • High energy-density metal-air batteries, like zinc-air, are crucial for electric vehicles and renewable energy storage.
  • Ionic liquids (ILs) possess favorable thermal and physical properties for use as electrolytes in large-scale energy storage.
  • Developing stable and efficient electrolytes is key to advancing rechargeable zinc-air battery technology.

Purpose of the Study:

  • To synthesize and characterize novel "chelating" ionic liquids designed to chelate and solubilize zinc ions.
  • To investigate the impact of ionic liquid structure on ionic conductivity, melting point, and zinc deposition electrochemistry.
  • To develop improved electrolytes for advanced zinc-air rechargeable batteries.

Main Methods:

  • Synthesis of quaternary alkoxy alkyl ammonium cations with varying oligo-ether side chains and different anions (p-toluene sulfonate, bis(trifluoromethylsulfonyl)amide, dicyanoamides).
  • Characterization of synthesized ionic liquids, including melting point and ionic conductivity measurements.
  • Electrochemical studies to evaluate zinc deposition and stripping behavior using techniques like cyclic voltammetry.

Main Results:

  • Increasing ether chain length in the cation reduced melting point and increased ionic conductivity in tosylate-based systems.
  • Reversible zinc deposition was achieved with bis(trifluoromethylsulfonyl)amide ([NTf2]) based ionic liquids, but not with tosylate-based ILs.
  • The [NTf2] anion demonstrated weaker coordination with zinc ions, allowing ether chain coordination to dominate zinc electrochemistry.

Conclusions:

  • Novel chelating ionic liquids show promise as electrolytes for rechargeable zinc-air batteries.
  • Ionic liquid cation structure (ether chain length) and anion type significantly influence electrolyte properties and zinc electrochemistry.
  • Tailored ionic liquids can facilitate efficient zinc deposition and stripping, advancing energy storage applications.