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Constructing Active Sites from Atomic-Scale Geometrical Engineering in Spinel Oxide Solid Solutions for Efficient and

Xin Yue1,2, Xueping Qin3, Yangdong Chen1,2

  • 1Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Collaborative Innovation Center of Advanced Energy Materials, School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Summary

Spinel oxides show promise as electrocatalysts for the oxygen evolution reaction (OER). This study engineered spinel oxide nanosheets to create more active sites, significantly boosting OER performance and durability.

Keywords:
cation vacancycationic misalignmentlattice strainoxygen evolution reactionspinel oxide solid solution

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Spinel oxides are cost-effective, non-precious metal electrocatalysts for oxygen evolution reaction (OER).
  • Enhancing OER performance in complex spinel oxide structures requires further investigation, particularly regarding active site construction.
  • Unoccupied octahedral interstices in spinel oxides represent an unexplored area for active site development.

Purpose of the Study:

  • To construct novel active sites on spinel oxides for enhanced oxygen evolution reaction (OER) catalysis.
  • To investigate the impact of cationic misalignment and defects on OER activity.
  • To develop a highly active and durable electrocatalyst for OER applications.

Main Methods:

  • Synthesis of MoFe2O4 and CoFe2O4 nanosheets on iron foam (MCFO NS/IF) via defect-induced cationic misalignment.
  • Characterization of the engineered spinel oxide structure and electronic properties.
  • Electrochemical evaluation of the catalyst's OER activity, kinetics, and durability.

Main Results:

  • The engineered MCFO NS/IF catalyst demonstrated superior OER activity with an onset potential of 1.41 V vs. RHE.
  • Achieved a high current density of 500 mA cm⁻² at an overpotential of 290 mV.
  • Exhibited fast kinetics (Tafel slope of 38 mV dec⁻¹) and exceptional durability over 1000 hours at 250 mA cm⁻².

Conclusions:

  • Cationic misalignment in spinel oxides effectively creates more active octahedral sites for OER.
  • The developed MCFO NS/IF electrocatalyst offers state-of-the-art performance for oxygen evolution reaction.
  • This approach provides a new strategy for designing advanced spinel oxide electrocatalysts.