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Oxidation Numbers03:14

Oxidation Numbers

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In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
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Oxidation of Phenols to Quinones01:17

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Updated: Jan 21, 2026

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

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A novel method for rapidly functionalizing perovskite oxides.

Weiwei Fan1, Zhu Sun2, Rui Xiao1

  • 1Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, 2 Dong Nan Da Xue Road, Nanjing, 211189, China. fanww@seu.edu.cn.

Nanoscale
|January 20, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a rapid method using pulsed thermal and voltage shocks to create exsolution-based perovskite catalysts in seconds. This technique enhances catalytic activity and electrochemical performance by increasing active sites and conductivity.

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Area of Science:

  • Materials Science
  • Catalysis
  • Electrochemistry

Background:

  • Perovskite oxides are crucial for catalysis and energy conversion.
  • Exsolution of metallic nanoparticles from perovskite hosts creates advanced metal/oxide heterogeneous catalysts.
  • Tuning perovskite catalytic activity is key for improved performance.

Purpose of the Study:

  • To develop a rapid method for triggering nanoparticle exsolution in perovskites.
  • To tune the electrochemical performance of perovskite catalysts.
  • To understand the relationship between exsolution parameters and catalyst properties.

Main Methods:

  • Applying pulsed thermal shock (∼50 ms pulse width) and voltage shock (∼40 s).
  • Utilizing multiple pulse cycles to control exsolution.
  • Analyzing the effect of pulse number on nanoparticle density and distribution.

Main Results:

  • Exsolution-based products were prepared on a timescale of seconds.
  • Increased pulse numbers initially enhanced particle density by increasing oxygen vacancies.
  • Particle density reached a threshold determined by exsolvable metal content.
  • Enhanced active sites and conducting paths significantly improved perovskite activity.

Conclusions:

  • Rapid exsolution is achievable using pulsed thermal and voltage shocks.
  • This method offers precise control over nanoparticle formation and catalyst properties.
  • The enhanced perovskite catalysts show significantly improved electrochemical performance.