Study on current efficiency of steam electrolysis using a partial protonic conductor SrZr0.9Yb0.1O3-α

Tetsuro Kobayashi, Katsushi Abe, Yoshio Ukyo, Hiroshige Matsumoto

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

The current efficiency of steam electrolysis was measured in the temperature range from 460 to 600 °C using a steam electrolysis cell constructed with a partial protonic conductor SrZr0.9Yb0.1O3-α as an electrolyte and Pt cermet electrodes. The efficiency was increased with increasing partial pressure of water vapor and temperature. The results were considered in relation to the reaction rates at the anode and cathode. Under the operating conditions of steam electrolysis, the reaction rate of producing H2 from protons at the cathode was found to be faster than that of oxidizing water vapor into protons and O2 at the anode. Therefore, the average concentration of protons in the partial protonic conductor during electrolysis decreased. On the other hand, the average concentration of holes increased. This is considered to decrease the efficiency of steam electrolysis. It was found that the effective transport numbers of charge carriers in the partial protonic conductor were controlled by the reaction rates at the electrodes at relatively low temperatures at which the equilibria between the atmosphere and defects in the partial protonic conductor were difficult to obtain.

Original languageEnglish
Pages (from-to)243-251
Number of pages9
JournalSolid State Ionics
Volume138
Issue number3-4
DOIs
Publication statusPublished - Jan 1 2001
Externally publishedYes

Fingerprint

Steam
electrolysis
Electrolysis
steam
conductors
Reaction rates
Protons
reaction kinetics
Water vapor
protons
water vapor
Anodes
Cathodes
anodes
cathodes
Cermet Cements
Electrodes
water temperature
electrodes
Charge carriers

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Study on current efficiency of steam electrolysis using a partial protonic conductor SrZr0.9Yb0.1O3-α . / Kobayashi, Tetsuro; Abe, Katsushi; Ukyo, Yoshio; Matsumoto, Hiroshige.

In: Solid State Ionics, Vol. 138, No. 3-4, 01.01.2001, p. 243-251.

Research output: Contribution to journalArticle

Kobayashi, Tetsuro ; Abe, Katsushi ; Ukyo, Yoshio ; Matsumoto, Hiroshige. / Study on current efficiency of steam electrolysis using a partial protonic conductor SrZr0.9Yb0.1O3-α In: Solid State Ionics. 2001 ; Vol. 138, No. 3-4. pp. 243-251.
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