Study of steam electrolysis using a microtubular ceramic reactor

S. Hashimoto, Y. Liu, M. Mori, Y. Funahashi, Y. Fujishiro

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Steam electrolysis was carried out using a microtubular ceramic reactor with the following cell configuration: La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF)-Ce0.8Gd0.2O1.9 (CGO) electrode/CGO buffer layer/(ZrO2)0.89(Sc2O3)0.1(CeO2)0.01 (ScSZ) electrolyte/Ni-ScSZ electrode supporting tube. 10% H2/Ar gas was used as steam carrier gas, and 18% steam was supplied to the ceramic reactors. The cell performance was as follows: 1.43 V at 0.1 A cm-2 and 650 °C (Area specific resistance: 4.7 Ω cm2) or 1.37 V at 0.1 A cm-2 and 700 °C (4.3 Ω cm2). During steam electrolysis, hydrogen production proportionally increased with current density according to Faraday's law, and heat generation at a low current density was observed by an electrochemical technique. Voids and Zr diffusion from the ScSZ electrolyte were confirmed in the CGO buffer layer. Such factors near the surface probably influenced the increase in ohmic loss and electrode polarization.

Original languageEnglish
Pages (from-to)1159-1165
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume34
Issue number3
DOIs
Publication statusPublished - 2009 Feb

Keywords

  • Hydrogen production
  • Reversible cell operation
  • SOEC
  • Steam electrolysis
  • Waste heat utilization

ASJC Scopus subject areas

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

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