The effect of gas compositions on the performance and durability of solid oxide electrolysis cells

Sun Dong Kim, Doo Won Seo, Arun Kumar Dorai, Sang Kuk Woo

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

High-temperature electrolysis with various gas compositions has been performed to investigate the effects of the hydrogen partial pressure and the humidity generated by the steam electrode on the performance and durability of solid oxide electrolysis cells. The power density of the button cell used in this research is 0.48 W cm-2 at 750 C, and the flow rates of the air and humidified hydrogen are 100 cc min-1. By changing the flow ratio of H2:Ar:H2O(g) from 10:0:4 to 1:9:4, the cell's OCV decreases from 0.973 V to 0.877 V, and the charge transfer resistance increases from 1.126 cm2 to 1.645 cm2. The close relationship between the conversion efficiency of high-temperature electrolysis and steam composition is evident in the increase in the cell's charge transfer resistance from 0.381 cm2 to 1.056 cm2 as the steam content changed from 40 vol% to 3 vol%. Although the electrochemical splitting of water is stimulated in the short term by excessive steam flow, the Ni-YSZ electrodes have been damaged by the steam electrode's low H2 partial pressure. Consequently, the steam electrode's gas composition must be optimized in the long-term because of the trade-off between performance and durability, which depends on the water concentration of the steam electrodes.

Original languageEnglish
Pages (from-to)6569-6576
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number16
DOIs
Publication statusPublished - 2013 May 30
Externally publishedYes

Keywords

  • Flat-tube
  • Gas composition
  • High-temperature electrolysis
  • Solid oxide electrolysis cells
  • Steam concentration

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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