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Corrosion02:49

Corrosion

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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...
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Formation of Complex Ions03:45

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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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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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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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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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An Inorganic Interface Protection Layer Enabling Coupled Charge Transport for Stable Sodium Metal Anodes.

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A new bifunctional interfacial layer (Na3P/Na3Sb) enhances sodium metal anode stability and safety in rechargeable batteries by preventing dendrite growth and improving ion transport.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Sodium (Na) metal anodes offer high capacity and low potential for advanced batteries.
  • Challenges include poor cycling stability and safety risks due to unstable solid electrolyte interphase (SEI) and dendrite growth.

Purpose of the Study:

  • To develop a stable and safe sodium metal anode by creating a protective interfacial layer.
  • To investigate the mechanism of the interfacial layer in regulating ion and electron transport and suppressing dendrites.

Main Methods:

  • An in situ spontaneous chemical reaction formed a bifunctional Na3P/Na3Sb (NPS) interfacial layer on the Na metal surface (NPS@Na).
  • Characterization of the NPS layer's structure and properties.
  • Electrochemical testing of Na3V2(PO4)3||NPS@Na full cells.

Main Results:

  • The NPS layer exhibited high ionic conductivity (Na3P) and electron-blocking properties (Na3Sb), decoupling ion and electron transport.
  • Uniform Na deposition and reduced parasitic reactions were observed.
  • The NPS layer effectively suppressed dendrite growth and maintained interfacial integrity.
  • The full cell demonstrated stable cycling with 80.09% capacity retention after 500 cycles at 10 C.

Conclusions:

  • The bifunctional NPS interfacial layer is a promising strategy for enhancing the performance and safety of sodium metal anodes.
  • This approach provides a blueprint for designing artificial interfacial layers for alkali metal anodes.