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This study enhances hydrogen production using solid oxide electrolysis cells (SOECs) by developing a novel Pr0.975Sm0.025O2-δ (PSO) nanoparticle catalyst for Ni-YSZ fuel electrodes. The modified electrodes show improved activity and durability for efficient water splitting.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Renewable Energy

Background:

  • High-temperature solid oxide electrolysis cells (SOECs) are efficient for hydrogen production.
  • Current SOECs face challenges with fuel electrode catalytic activity and stability.
  • Oxygen-ion conducting electrolytes are key to SOEC efficiency.

Purpose of the Study:

  • To enhance the catalytic activity and durability of Ni-YSZ fuel electrodes for water splitting in SOECs.
  • To investigate the effect of Pr0.975Sm0.025O2-δ (PSO) nanoparticle surface catalysts.
  • To improve hydrogen production efficiency and stability in SOECs.

Main Methods:

  • Fabrication of Ni-YSZ fuel electrodes modified with PSO nanoparticles.
  • Electrochemical characterization including fuel cell mode performance and water splitting tests.
  • Material analysis using X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) with distribution of relaxation times (DRT).

Main Results:

  • PSO-modified Ni-YSZ electrodes demonstrated significantly enhanced catalytic activity and durability.
  • Achieved a peak power density of 1.27 W cm-2 in fuel cell mode.
  • Demonstrated excellent stability at -0.5 A cm-2 for over 200 hours at 700 °C with 50% H2O.
  • Achieved a hydrogen production rate of 3.48 mL min-1 cm-2 with nearly 100% Faradaic efficiency at 700 °C.

Conclusions:

  • The Pr3+/Pr4+ redox couple and oxygen vacancies in PSO contribute to improved catalytic performance.
  • The developed PSO-modified Ni-YSZ electrodes offer a promising solution for efficient and stable hydrogen production via SOECs.
  • This advancement addresses key challenges in SOEC technology for renewable hydrogen generation.