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Hybridizing Electrode Interface Structures in Protonic Ceramic Cells for Durable, Reversible Hydrogen and Power

Shuanglin Zheng1, Bin Liu2, Guntae Kim3

  • 1School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK, 73019, USA.

Advanced Materials (Deerfield Beach, Fla.)
|May 21, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel hybrid oxygen electrode for protonic ceramic electrochemical cells (PCECs) to boost hydrogen production and power generation efficiency. This innovation enhances electrode kinetics, improving overall device performance and durability.

Keywords:
density functional theoryprotonic ceramic electrochemical cellsreconstructed hybrid high‐catalytic oxygen electrodesteam electrolysissynergy of surface and bulk behaviors

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Area of Science:

  • Materials Science and Engineering
  • Electrochemistry
  • Renewable Energy Technologies

Background:

  • Protonic ceramic electrochemical cells (PCECs) offer efficient energy conversion for sustainable hydrogen production and power generation.
  • Intermediate-temperature operation of PCECs relies on proton-conducting electrolytes but is limited by sluggish oxygen electrode kinetics.

Purpose of the Study:

  • To develop an advanced hybrid oxygen electrode to overcome kinetic limitations in PCECs.
  • To enhance oxygen adsorption, diffusion, and catalytic activity at the electrode-electrolyte interface.

Main Methods:

  • Fabrication of a hybrid oxygen electrode using a PrNi0.7Co0.3O3-δ (PNC) backbone infused with oxygen vacancy-rich praseodymium oxide (PrOx) nanoparticles.
  • Characterization of electrode properties, including surface and bulk characteristics, and performance evaluation in PCECs.

Main Results:

  • The hybrid electrode demonstrated significantly enhanced oxygen adsorption and catalytic kinetics due to abundant oxygen vacancies and modulated d-band center in PrOx.
  • PCECs with the hybrid electrode achieved a peak power density of 1.56 W cm-2 (fuel cell mode) and a current density of 2.25 A cm-2 (electrolysis mode).
  • High Faradaic (96.8%) and energy (89.9%) efficiencies were recorded, alongside excellent thermal cycling stability and reduced polarization resistance (0.079 Ω cm2).

Conclusions:

  • The developed hybrid oxygen electrode architecture effectively addresses the bottleneck of sluggish kinetics in PCECs.
  • This advancement holds significant potential for improving the efficiency, durability, and broader applicability of PCECs in renewable energy systems.