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Related Concept Videos

Electrodeposition01:08

Electrodeposition

689
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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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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Zinc Electrode Cycling in Deep Eutectic Solvent Electrolytes: An Electrochemical Study.

Elisa Emanuele1, Andrea Li Bassi1, Andrea Macrelli1

  • 1Department of Energy, Politecnico di Milano, Via Lambruschini 4, 20156 Milano, Italy.

Molecules (Basel, Switzerland)
|February 11, 2023
PubMed
Summary

Researchers explored hydrated deep eutectic solvents (DESs) for safer, high-performance zinc batteries. They developed a novel DES/water/zinc sulfate electrolyte offering optimal cycling and stability, addressing key challenges in aqueous zinc systems.

Keywords:
ZnZn anodedeep eutectic solventpost-lithiumshape changewater activity

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Zinc-ion batteries are promising post-lithium-ion technologies due to high energy density, low cost, and safety.
  • Aqueous zinc anodes face issues like hydrogen evolution and passivation, limiting their performance.
  • Deep eutectic solvents (DESs) offer a green, low-cost alternative electrolyte, potentially improving zinc anode cycling and suppressing dendrites.

Purpose of the Study:

  • To investigate the fundamental electrochemistry of zinc anodes in hydrated DESs.
  • To evaluate the potential of DES-based electrolytes for rechargeable zinc batteries.
  • To develop and optimize a novel DES/water/zinc sulfate electrolyte for enhanced battery performance.

Main Methods:

  • Cyclic voltammetry and chronoamperometry were used to study electrokinetic and electrocrystallization behavior.
  • Galvanostatic cycling of Zn|Zn symmetric coin cells assessed long-term stability.
  • Scanning Electron Microscopy (SEM) and in situ Surface-Enhanced Raman Spectroscopy (SERS) analyzed electrode morphology and interfacial reactions.

Main Results:

  • The study characterized zinc electrochemistry in two hydrated DESs (ChU and ChEG with ~30% H2O).
  • Hydrated DESs demonstrated improved ionic conductivity and viscosity compared to dry DESs.
  • A specific DES/H2O/ZnSO4 electrolyte formulation showed optimal functional performance and cycling stability.

Conclusions:

  • Hydrated DESs are viable electrolytes for rechargeable zinc batteries, mitigating issues associated with aqueous systems.
  • The proposed DES/H2O/ZnSO4 electrolyte offers a promising pathway for developing high-performance, safe, and cost-effective zinc batteries.
  • Fundamental electrochemical understanding and morphological analysis are crucial for rationalizing electrolyte performance.