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yesterday

Korea–Japan Team Reports 'Breathing' Oxide That Reversibly Cycles Oxygen at 400 °C

Selective cobalt reduction stabilizes a new crystal phase to enable lower-temperature fuel cells.

A new type of crystalline material comprising strontium, iron, and cobalt, can release oxygen on demand when heated – without breaking down
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Overview

  • The material, SrFe0.5Co0.5O2.5, is a strontium–iron–cobalt oxide that releases oxygen when heated and reabsorbs it under milder conditions.
  • Experiments demonstrate repeatable oxygen cycling near 400 °C without structural breakdown, overcoming durability limits seen in prior candidates.
  • Only cobalt ions are reduced during operation, producing a stable phase that re-oxidizes back to the original structure.
  • The research, led by Hyoungjeen Jeen of Pusan National University and Hiromichi Ohta of Hokkaido University, was published August 15 in Nature Communications.
  • Potential applications highlighted include solid oxide fuel cells, thermal transistors, and smart windows, with device integration and scale-up still ahead.