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Highly Oxidized Oxide Surface toward Optimum Oxygen Evolution Reaction by Termination Engineering.

Xiaoning Li1, Liangbing Ge2, Yumeng Du1

  • 1Institute for Superconducting and Electronic Materials (ISEM), Australia Institute for Innovative Materials, Innovation Campus, University of Wollongong, North Wollongong, NSW 2500, Australia.

ACS Nano
|March 21, 2023
PubMed
Summary
This summary is machine-generated.

We engineered a novel cobalt oxide (Co3O4) nanosheet catalyst with a unique surface structure. This advanced catalyst significantly boosts the oxygen evolution reaction (OER) for sustainable energy, outperforming commercial standards.

Keywords:
facetoxidized oxygenoxygen evolution reactionspinel oxidetermination engineering

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Area of Science:

  • Electrochemistry and Catalysis
  • Materials Science for Energy Applications

Background:

  • The oxygen evolution reaction (OER) is crucial for sustainable fuel production via electrochemistry.
  • Maximizing active sites and intrinsic activity, particularly lattice oxygen activation, is key for nanocatalysts.
  • Surface reconfiguration to oxyhydroxide is common in transition metal oxides, necessitating new surface terminations.

Purpose of the Study:

  • To develop a novel surface termination for cobalt oxide (Co3O4) nanocatalysts.
  • To enhance the intrinsic activity and efficiency of the oxygen evolution reaction (OER).
  • To explore new strategies for oxide electrocatalyst design in energy conversion.

Main Methods:

  • Synthesis of (111)-facet Co3O4 nanosheets with a specific surface termination.
  • Electrochemical characterization to evaluate OER performance.
  • Analysis of surface states and oxygen oxidation states.

Main Results:

  • Demonstrated an unusual surface termination on Co3O4 nanosheets, resembling CoOOH with edge-sharing octahedral Co3+.
  • Achieved approximately 40 times higher current density at 1.63 V (vs RHE) compared to commercial RuO2.
  • Identified an oxidized oxygen state at the surface acting as an independent active site, breaking scaling limits.

Conclusions:

  • Surface termination engineering of Co3O4 nanosheets can dramatically enhance OER activity.
  • The unique surface structure with oxidized oxygen sites offers a new pathway for high-performance electrocatalysts.
  • This approach advances oxide electrocatalyst applications in sustainable energy conversion.