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Related Concept Videos

Oxidative Cleavage of Alkenes: Ozonolysis01:46

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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
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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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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
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Regulating Ir-O Covalency to Boost Acidic Oxygen Evolution Reaction.

Jiayan Wu1, Wenwu Zou1, Jiaxi Zhang1

  • 1Guangdong Provincial Key Laboratory of Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 15, 2023
PubMed
Summary

Incorporating trivalent metals into iridium dioxide (IrO2) boosts its oxygen evolution reaction (OER) activity for efficient hydrogen production. This enhancement stems from increased Ir-O covalency, enabling a lattice oxygen-mediated mechanism.

Keywords:
Ir–O covalencyacidic oxygen evolution reactionlattice oxidation mechanismtrivalent metal substitution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is crucial for hydrogen generation via water electrolysis.
  • Iridium dioxide (IrO2) is a key electrocatalyst, but its activity and cost remain challenges.
  • Proton exchange membrane water electrolyzers require highly active and stable OER electrocatalysts.

Purpose of the Study:

  • To enhance the acidic OER activity of rutile IrO2.
  • To investigate the effect of metal incorporation on Ir-O covalency and OER performance.
  • To establish a strategy for improving IrO2-based electrocatalysts for water splitting.

Main Methods:

  • Incorporation of trivalent metals (Gd, Nd, Pr) into the IrO2 lattice.
  • Experimental characterization of synthesized materials.
  • Theoretical analyses including density functional theory (DFT) calculations.
  • Electrochemical testing of OER activity and stability in acidic media.

Main Results:

  • Trivalent metal incorporation significantly enhanced IrO2's OER activity by increasing Ir-O covalency.
  • High-valence metal incorporation decreased Ir-O covalency, leading to poorer OER performance.
  • A linear relationship was observed between intrinsic activity and Ir-O covalency.
  • Gd-IrO2-δ achieved an overpotential of 260 mV at 10 mA cm⁻², with 200-hour stability.

Conclusions:

  • Regulating Ir-O covalency is an effective strategy to boost OER activity in IrO2 electrocatalysts.
  • Enhanced Ir-O covalency activates lattice oxygen, promoting a lattice oxygen-mediated OER mechanism.
  • This approach offers a pathway to reduce the cost and energy consumption of hydrogen production.