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Electrodeposition01:08

Electrodeposition

652
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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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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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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Formation of Complex Ions

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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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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Related Experiment Video

Updated: Jul 15, 2025

Zinc-Sponge Battery Electrodes that Suppress Dendrites
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Fast Ionic Conducting Hydroxyapatite Solid Electrolyte Interphase Enables Ultra-Stable Zinc Metal Anodes.

Qizhen Han1, Lucheng Cai1, Pengfei Huang1

  • 1School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.

ACS Applied Materials & Interfaces
|October 4, 2023
PubMed
Summary

Hydroxyapatite coating on zinc anodes prevents dendrite formation in zinc-ion batteries. This enhancement ensures stable cycling and improved performance for next-generation energy storage.

Keywords:
Zn metal anodeaqueous zinc-ion batteryartificial solid electrolyte interphasedendrite inhibitionhydroxyapatite

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Zinc metal anodes are cost-effective for aqueous zinc-ion batteries but suffer from dendrite growth and side reactions.
  • These issues hinder the commercial viability of zinc-based energy storage systems.
  • Developing protective layers is crucial for stable zinc anode performance.

Purpose of the Study:

  • To engineer a protective hydroxyapatite (HAP) coating on zinc anodes.
  • To investigate the effect of the HAP coating on dendrite suppression and anode stability.
  • To evaluate the electrochemical performance of HAP-coated zinc anodes in symmetric and full battery configurations.

Main Methods:

  • Fabrication of a hydroxyapatite (HAP) surface coating on zinc (Zn) metal anodes.
  • Electrochemical characterization using symmetric cells and full cells with MnO2 cathodes.
  • Long-term cycling tests to assess lifespan, polarization, and rate capability.

Main Results:

  • The HAP coating effectively suppressed zinc dendrite formation and corrosion.
  • The artificial solid electrolyte interphase facilitated fast anodic redox kinetics with a low ionic diffusion barrier.
  • Zn@HAP symmetric cells demonstrated a lifespan exceeding 2000 hours at 1 mA cm⁻² with minimal polarization.
  • Full batteries with Zn@HAP anodes showed stable cycling over 500 cycles at 1 A g⁻¹ and excellent rate capability.

Conclusions:

  • Hydroxyapatite coating is a viable strategy to create a stable artificial solid electrolyte interphase for zinc anodes.
  • The Zn@HAP anode exhibits enhanced cycling stability, suppressed dendrites, and improved rate performance.
  • This approach significantly advances the practical application of aqueous zinc-ion batteries.