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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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Electrodeposition01:08

Electrodeposition

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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.
Electrodeposition can...
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Zener Diodes01:16

Zener Diodes

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Zener diodes are specialized semiconductor devices designed to operate in the reverse breakdown region, where they allow current to flow into the cathode, making it positive relative to the anode. This reverse operation distinguishes Zener diodes from conventional diodes and enables their use in various applications, most notably as voltage regulators. One of the defining characteristics of Zener diodes is their nearly vertical I-V (current-voltage) characteristic curve above a certain...
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EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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...
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Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

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Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
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Zinc-Sponge Battery Electrodes that Suppress Dendrites
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Stable Zn Anodes with Triple Gradients.

Yong Gao1,2, Qinghe Cao1,2, Jie Pu1

  • 1Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China.

Advanced Materials (Deerfield Beach, Fla.)
|November 20, 2022
PubMed
Summary
This summary is machine-generated.

A novel triple-gradient electrode prevents zinc dendrite growth in aqueous zinc-ion batteries. This innovation enhances battery cycle life and performance for sustainable energy storage.

Keywords:
Zn anodesZn deposition behaviorZn-ion batteriesdendrite freetriple gradients

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • Aqueous zinc-ion batteries (AZIBs) are promising for sustainable energy storage.
  • Zinc (Zn) dendrite growth during cycling leads to short circuits and reduced battery lifespan.

Purpose of the Study:

  • To develop a dendrite-free Zn anode for AZIBs.
  • To improve the cycle life and stability of AZIBs.

Main Methods:

  • Fabrication of a triple-gradient electrode integrating gradient conductivity, zincophilicity, and porosity.
  • Mechanical rolling-induced design to optimize electric field distribution and ion flux.
  • Electrochemical testing of the gradient electrode in AZIBs.

Main Results:

  • The triple-gradient electrode demonstrated a dendrite-free Zn deposition.
  • Achieved low overpotential (35 mV) and extended cycling stability (400 h at 5 mA cm⁻²).
  • Outperformed non-gradient, single-gradient, and dual-gradient electrodes.

Conclusions:

  • The triple-gradient strategy effectively suppresses Zn dendrites and enhances AZIB performance.
  • This facile fabrication method offers a pathway for high-performance energy storage devices.
  • The tunable materials and structures provide inspiration for future battery designs.