Oxygen pumping characteristics of YBaCo4O7+δ for solar thermochemical cycles

Mai Xu, Ivan Ermanoski, Ellen B. Stechel, Shuguang Deng

Research output: Contribution to journalArticle

Abstract

A new medium-temperature oxygen sorbent material, YBaCo4O7+δ, was prepared and investigated for its potential applications as an oxygen pumping material to facilitate solar thermochemical fuel production using a two-step metal oxide redox cycle. The oxygen uptake and release attributes of YBaCo4O7+δ were studied by both thermogravimetric analysis and a small-scale vacuum test. The results reveal that the oxygen uptake capacity and kinetics of YBaCo4O7+δ depends on both the uptake temperature and partial pressure of oxygen (pO2), and can also be affected by the particle size. In the vacuum test, YBaCo4O7+δ could bring down the pO2 of a vacuum chamber from 21 kPa to 0.5 kPa, which accounted for over 97% of the oxygen in the system. It was also found that the major issue for applying YBaCo4O7+δ as pumping material came from the slow kinetics at the low pO2 level. The current study has proved that the particle size has a significant effect on the pumping behavior of YBaCo4O7+δ, especially for the uptake kinetics. Further research would be required for material development to make this application economically practical.

Original languageEnglish
Article number124026
JournalChemical Engineering Journal
Volume389
DOIs
Publication statusPublished - Jun 1 2020

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Keywords

  • Oxygen pumping
  • Sorption
  • Thermochemical cycles
  • YBaCoO

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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