ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Steam Electrolysis Using LaGaO3 Based Perovskite Electrolyte for Recovery of Unused Heat Energy
Tatsumi IshiharaTakao Kanno
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2010 Volume 50 Issue 9 Pages 1291-1295

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Abstract

Application of LaGaO3 based electrolyte for steam electrolysis was studied for the useful utilization of unused heat energy from steelmaking process. It was found that the H2 formation rate almost obeys the Faraday's law suggesting unity of oxide ion transport number in LaGaO3 perovskite under an electrolysis condition up to 2.0 V applied potential. Among the examined cathode catalyst, nickel shows the smallest cathodic overpotential and the addition of Fe to Ni is highly effective for increasing the H2 formation rate in the steam electrolysis at 873 K. The highest H2 formation rate is obtained at the composition of Ni : Fe = 9 : 1. Short stack of the steam electrolysis cell consisting of 25 cells in series connection was also studied and the formation rate of H2 was achieved as large as 70 L/min at 1.8 V applied potential. Heat balance was calculated based on the developed stack level. It became clear that the heat source of 223 K level is enough for sustaining cell temperature because of large Joule heat.

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© 2010 by The Iron and Steel Institute of Japan
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