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Vacancy-Redox Coupling at Interface-Engineered Heterostructures Enhances Reversible Energy Conversion in Protonic

Shuanglin Zheng1, Yuqi Geng1, Subrina Islam2

  • 1School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK, USA.

Angewandte Chemie (International Ed. in English)
|April 11, 2026
PubMed
Summary
This summary is machine-generated.

We developed a novel oxygen electrode for protonic ceramic cells (PCCs) using a hierarchical structure. This design enhances catalytic activity and durability for efficient energy conversion.

Keywords:
heterostructureinterface engineeringoxygen vacancyredoxreversible protonic ceramic cells

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Protonic ceramic cells (PCCs) require efficient oxygen electrocatalysis for energy applications.
  • Controlling defect chemistry and cation redox under steam is crucial for PCC performance and durability.

Purpose of the Study:

  • To design and investigate a hierarchically engineered oxygen electrode for enhanced performance in PCCs.
  • To understand the role of defect chemistry and interphases in improving oxygen electrocatalysis.

Main Methods:

  • Fabrication of a 3D mesh-like PrNi0.7Co0.3O3-δ (PNC) scaffold integrated with a vacancy-rich PrOₓ nanophase.
  • Characterization of the electrode architecture and interfacial properties.
  • Electrochemical testing in fuel-cell and electrolysis modes at 600°C.

Main Results:

  • The hierarchical electrode architecture extended the reactive zone and created a PrOₓ-PNC interphase.
  • Vacancy-mediated redox coupling between Pr and Co buffered oxygen potential and stabilized defects.
  • The electrode achieved high performance (1.75 W cm⁻² in fuel-cell mode, 2.77 A cm⁻² at 1.3 V in electrolysis) with >92% Faradaic efficiency and >200 h durability.

Conclusions:

  • Hierarchical engineering coupled with redox-buffered interphases is a viable strategy for high-performance PCCs.
  • The developed electrode demonstrates significant potential for efficient and durable energy conversion systems.
  • Understanding interfacial defect chemistry is key to optimizing protonic electrochemical devices.