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A Highly Active, Long-Lived Oxygen Evolution Electrocatalyst Derived from Open-Framework Iridates.

Lan Yang1, Lei Shi1, Hui Chen1

  • 1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China.

Advanced Materials (Deerfield Beach, Fla.)
|December 31, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a new, highly active, and ultrastable iridium-based electrocatalyst for the oxygen evolution reaction. This novel catalyst, derived from strontium iridates, demonstrates exceptional performance and durability in acidic conditions.

Keywords:
electrocatalysisiridiumopen framework structuresoxygen evolution reactionwater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is crucial for energy conversion but requires efficient electrocatalysts, particularly in acidic media.
  • Current industrial OER electrocatalysts often rely on iridium, which is expensive and can be unstable.
  • Developing robust and active iridium-based catalysts for acidic OER is a significant challenge.

Purpose of the Study:

  • To synthesize metastable strontium iridates with an open-framework structure.
  • To investigate the transformation of these iridates into a highly active and ultrastable oxygen evolution nano-electrocatalyst.
  • To understand the mechanism of this transformation and its benefits for acidic OER.

Main Methods:

  • Phase-selective synthesis of metastable strontium iridates.
  • Acidic treatment for Sr2+/H+ ion exchange.
  • In situ electrochemical characterization under OER conditions.
  • Microstructural analysis of the resulting nanocatalyst.

Main Results:

  • Open-framework strontium iridates undergo facile proton exchange without amorphization.
  • Protonated iridates transform into ultrasmall, surface-hydroxylated, rutile nanocatalysts with (200) plane orientation.
  • The derived nanocatalyst exhibits high activity and ultrastability (>1000 h) for acidic OER.
  • The unique microstructure enhances hydroxyl oxidation and O-O bond formation.

Conclusions:

  • Metastable open-framework strontium iridates can be controllably transformed into superior OER electrocatalysts.
  • The resulting rutile nanocatalyst offers a promising alternative to conventional iridium-based catalysts for acidic environments.
  • This work provides insights into designing advanced electrocatalysts through structural transformation.