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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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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.
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Ion Exchange01:17

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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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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Zinc-Sponge Battery Electrodes that Suppress Dendrites
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Constructing a Topologically Adaptable Solid Electrolyte Interphase for a Highly Reversible Zinc Anode.

Tong Yan1, Sucheng Liu1, Jinye Li2

  • 1Guangdong Provincial Key Laboratory of Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.

ACS Nano
|January 17, 2024
PubMed
Summary
This summary is machine-generated.

l-glutamine additive stabilizes the solid electrolyte interphase (SEI) in aqueous zinc batteries. This hybrid SEI enhances anode stability, enabling ultralong cycle life and high capacity for zinc batteries.

Keywords:
Zn metal anodeelectrolyte additivemechanical behaviorsolid electrolyte interphasetopologically adaptable

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Aqueous zinc batteries face performance limitations due to unstable solid electrolyte interphase (SEI) and electrical double layer (EDL) structures.
  • Understanding the mechanical properties of the SEI is critical for managing stress from volume changes during battery operation.

Purpose of the Study:

  • To investigate l-glutamine (Gln) as an additive for regulating the EDL and forming a stable, hybrid SEI.
  • To evaluate the mechanical properties and topological adaptability of the Gln-modified SEI.
  • To assess the electrochemical performance of zinc anodes with the hybrid SEI in symmetric and full cells.

Main Methods:

  • Introduction of l-glutamine (Gln) as an additive to aqueous electrolytes.
  • In situ formation of a hybrid SEI composed of ZnS and Gln-related species.
  • Nanoindentation testing to characterize SEI mechanical properties (modulus, hardness, shape recovery).
  • Electrochemical testing of Zn//Zn symmetric cells and Zn//NH4V4O10 full cells.

Main Results:

  • The hybrid SEI exhibits low modulus and hardness with excellent shape recovery.
  • The SEI effectively suppresses side reactions and adapts to volume fluctuations of the zinc anode.
  • Zn//Zn symmetric cells achieved an ultralong cycle life of 4000 hours.
  • High cumulative capacity of 18,000 mA h was demonstrated in pouch cells.
  • The strategy showed superior performance in full cells across various N/P ratios.

Conclusions:

  • l-glutamine is a promising additive for interfacial engineering in aqueous zinc batteries.
  • The developed hybrid SEI significantly enhances the stability and cycle life of zinc anodes.
  • This approach offers a viable pathway for advanced interfacial modulation in aqueous battery systems.