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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
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Origin for electrochemically driven phase transformation in the oxygen electrode for a solid oxide cell.

Emir Dogdibegovic1, Yudong Wang1,2, Xiao-Dong Zhou1,2

  • 1Department of Chemical Engineering, University of South Carolina, Columbia, SC 29065.

Proceedings of the National Academy of Sciences of the United States of America
|November 2, 2022
PubMed
Summary
This summary is machine-generated.

Researchers investigated phase changes in praseodymium nickelates for advanced energy devices. Understanding electrochemically driven phase transformations is key to improving fuel cells, electrolyzers, and batteries.

Keywords:
electrochemically driven phase transformationoxygen electrodesolid oxide cellsstability

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Advanced energy storage and conversion devices like fuel cells, electrolyzers, and batteries demand materials with higher power, faster kinetics, and greater energy density.
  • Compositionally complex oxides are crucial for achieving multifunctionalities and activity in next-generation energy devices.
  • Electrochemical processes can induce phase transformations in these oxides, a phenomenon termed 'electrochemically driven phase transformation,' whose origins are not fully understood.

Purpose of the Study:

  • To experimentally study and theoretically analyze the phase evolution in praseodymium nickelates.
  • To elucidate the origin of electrochemically driven phase transformations in oxygen electrodes.
  • To develop strategies for suppressing undesirable phase changes and enhancing device performance.

Main Methods:

  • Experimental investigation of phase evolution in praseodymium nickelates under electrochemical conditions.
  • Theoretical analysis to identify the driving forces behind phase transformations.
  • Comparative analysis of electrochemically driven phase transformation versus thermal annealing.
  • Implementation of interface engineering by introducing electronic conduction to suppress phase changes.

Main Results:

  • Nickelate-based electrodes exhibited up to a 60-fold increase in phase transformation during operation compared to thermally annealed samples.
  • Theoretical analysis identified reduced oxygen partial pressure at the electrode-electrolyte interface as the primary cause of phase transformation in oxygen electrodes.
  • Introducing electronic conduction into the interface layer significantly suppressed phase changes.

Conclusions:

  • Electrocatalyst phase stability is critical for the performance and longevity of advanced electrochemical devices.
  • Understanding and controlling electrochemically driven phase transformations, particularly in nickelates, is essential for optimizing energy technologies.
  • Interface engineering by enhancing electronic conduction offers a promising route to stabilize oxide phases and improve cell performance and stability.