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Oxidation-Reduction Reactions03:11

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Related Experiment Video

Updated: Jul 2, 2025

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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FeCoNi molybdenum-based oxides for efficient electrocatalytic oxygen evolution reaction.

Weikai Fan1, Chaofan Liu1, Hairong Wang2

  • 1College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.

Journal of Colloid and Interface Science
|February 16, 2024
PubMed
Summary

Researchers developed a new multi-metal oxide electrocatalyst (FeCoNi-MoO4) for sustainable energy. This efficient and stable catalyst accelerates the oxygen evolution reaction, crucial for clean energy technologies.

Keywords:
ElectrocatalystOxygen evolution reactionSynergistic effectTransition metal oxide

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • The development of efficient and cost-effective electrocatalysts is essential for advancing sustainable energy solutions.
  • Electrocatalysts play a critical role in energy conversion processes, such as water splitting and fuel cells.
  • Molybdenum-based oxides are promising candidates for electrocatalytic applications.

Purpose of the Study:

  • To fabricate a novel self-supported multi-metal molybdenum-based oxide electrocatalyst.
  • To investigate the electrocatalytic activity and stability of the fabricated material for the oxygen evolution reaction (OER).
  • To understand the underlying mechanisms responsible for enhanced OER performance using experimental and computational methods.

Main Methods:

  • A one-step hydrothermal synthesis method was employed to prepare FeCoNi-MoO4 on nickel foam.
  • Electrochemical performance was evaluated using techniques such as linear sweep voltammetry and chronoamperometry.
  • Density functional theory (DFT) calculations were performed to elucidate the electronic structure and reaction mechanisms.

Main Results:

  • The FeCoNi-MoO4 electrocatalyst exhibited excellent OER performance with low overpotentials of 204 mV at 10 mA cm⁻² and 271 mV at 100 mA cm⁻².
  • A low Tafel slope of 50.6 mV dec⁻¹ indicated enhanced OER kinetics, attributed to the multi-metal composition and increased active sites.
  • The electrode demonstrated remarkable long-term stability, operating continuously for over 48 hours.

Conclusions:

  • The incorporation of Fe and Co into the MoO4 framework significantly enhances OER activity by modifying microstructure and electronic properties.
  • FeCoNi-MoO4 serves as a highly efficient, stable, and cost-effective electrocatalyst for the oxygen evolution reaction.
  • This study presents a promising strategy for designing advanced electrocatalysts for sustainable energy applications.