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High-Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts.

Cyriac Massué1,2, Verena Pfeifer1, Xing Huang1

  • 1Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195, Berlin, Germany.

Chemsuschem
|February 7, 2017
PubMed
Summary

Developing a stable and active electrocatalyst for the oxygen evolution reaction (OER) is crucial for acidic water splitting. Microwave-assisted synthesis yielded a highly active amorphous iridium oxohydroxide catalyst, outperforming crystalline iridium oxide.

Keywords:
electrocatalysisenergy storageiridiumoxygen evolution reactionwater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Industrial-scale acidic water splitting requires highly active and stable electrocatalysts for the oxygen evolution reaction (OER).
  • Current catalysts often face challenges with stability and performance under acidic conditions.
  • Developing novel catalytic materials is essential to overcome these limitations.

Purpose of the Study:

  • To synthesize and characterize a novel, high-performance electrocatalyst for the anodic OER in acidic media.
  • To investigate the relationship between the catalyst's phase, structure, and its OER activity and stability.
  • To explore the potential of amorphous iridium oxohydroxides as alternatives to crystalline iridium dioxide.

Main Methods:

  • Microwave (MW)-assisted hydrothermal synthesis of iridium (Ir) loaded onto antimony-doped tin oxide (ATO) nanoparticles.
  • X-ray diffraction (XRD) to identify the crystalline/amorphous nature of the synthesized Ir phase.
  • Stepwise thermal treatment to gradually alter the amorphous Ir phase and assess its impact on OER performance.

Main Results:

  • An outstanding OER catalyst was successfully synthesized using MW-assisted hydrothermal methods, identified as amorphous, highly hydrated IrIII/IV oxohydroxide.
  • Stepwise thermal treatment led to dehydroxylation and crystallization of IrO2, causing a significant decrease in OER performance.
  • The amorphous IrIII/IV oxohydroxide phase demonstrated superior activity and stability compared to crystalline IrO2.

Conclusions:

  • The exceptional electrocatalytic properties of the MW-produced catalyst are intrinsically linked to its amorphous IrIII/IV oxohydroxide phase.
  • This finding contrasts with traditional methods yielding stable but less active crystalline IrO2.
  • Amorphous Ir oxohydroxide-based electrocatalysts show immense potential for stable, high-current acidic water electrolysis.