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Related Concept Videos

Alkali Metals03:06

Alkali Metals

19.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
19.3K
Electrodeposition01:08

Electrodeposition

638
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...
638
Corrosion02:49

Corrosion

24.5K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
24.5K
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

587
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
587
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

11.6K
Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
11.6K
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

664
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
664

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Updated: Jul 8, 2025

The Effect of Anodization Parameters on the Aluminum Oxide Dielectric Layer of Thin-Film Transistors
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The Effect of Anodization Parameters on the Aluminum Oxide Dielectric Layer of Thin-Film Transistors

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Dynamically Evolving Multifunctional Protective Layer for Highly Stable Potassium Metal Anodes.

Zhen Sun1, Miao Liu1, Bingqian Liu1

  • 1State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, People's Republic of China.

ACS Applied Materials & Interfaces
|December 11, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a new dynamic strategy to create a protective K-Ge alloy layer on potassium metal anodes. This layer effectively suppresses dendrite growth, enabling stable battery performance for over 1000 hours.

Keywords:
artificial protective layerdendrite-freehigh ionic conductivitypotassium metal batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Potassium (K) metal anodes face challenges like uncontrolled dendrite growth and unstable solid electrolyte interphase (SEI).
  • Artificial protective layers are crucial for stabilizing K metal anodes in high-energy batteries.
  • Existing *in situ* and *ex situ* fabrication methods have limitations.

Purpose of the Study:

  • To propose a novel dynamic evolution strategy for fabricating a multifunctional protective layer on K metal anodes.
  • To integrate the advantages of both *in situ* and *ex situ* preparation techniques.
  • To enhance the stability and performance of K metal anodes for battery applications.

Main Methods:

  • Preparation of a K-Ge alloy-enriched protective layer on K metal via surface modification and *in situ* electrochemical reduction.
  • Characterization of the protective layer's properties, including potassiophilicity, mechanical flexibility, and ionic conductivity.
  • Testing of K metal anodes in symmetric cells and full cells to evaluate plating/striping behavior, cycling stability, and rate performance.

Main Results:

  • The multifunctional protective layer exhibits excellent potassiophilicity, mechanical flexibility, and high ionic conductivity.
  • The protected K electrode demonstrates dendrite-free K plating/striping behavior.
  • Symmetric cells achieve stable operation for over 1000 hours at 1 mA cm⁻² and 1 mAh cm⁻², and full cells show enhanced rate and cycling performance compared to bare K anodes.

Conclusions:

  • The dynamic evolution strategy effectively creates a protective K-Ge alloy layer that inhibits dendrite growth and reduces side reactions.
  • This approach significantly improves the electrochemical performance and stability of K metal anodes.
  • The strategy offers a promising new avenue for protecting metal anodes and can be extended to other high-energy battery systems.