# Atmosphere dependence of anode reaction of intermediate temperature steam electrolysis using perovskite type proton conductor

Takaaki Sakai, Keita Arakawa, Masako Ogushi, Tatsumi Ishihara, Hiroshige Matsumoto, Yuji Okuyama

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

## Abstract

The effect of oxygen partial pressure on anode reaction of steam electrolysis using SrZr0.5Ce0.4Y0.1O3-α (SZCY-541) proton conducting electrolyte was investigated by AC impedance measurement in this work. The anode reaction was enhanced by increasing oxygen partial pressure, and this result was opposite to the expectation from the conventional anode reaction (water splitting reaction). The increase in the electrode reaction conductivity with oxygen chemical potential was proportional to PO21/4$${P_{{\mathrm{O}}_2}}^{1/4}$$ at 600 °C and at higher oxygen partial pressure region of 700 and 800 °C, suggesting the possibility that the enhancement is caused by the increase in hole concentration on the electrolyte surface near the anode.

Original language English 23 1793-1798 6 Journal of Solid State Electrochemistry 19 6 https://doi.org/10.1007/s10008-015-2808-9 Published - Jun 23 2015

## All Science Journal Classification (ASJC) codes

• Materials Science(all)
• Condensed Matter Physics
• Electrochemistry
• Electrical and Electronic Engineering