ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
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Preparation of La0.9Sr0.1Ga0.8Mg0.2O3 Film by Pulse Laser Deposition (PLD) Method on Porous Ni–Fe Metal Substrate for CO2 Electrolysis
Tatsumi IshiharaHajime KusabaHack Ho KimBiyon Su Kang
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2019 Volume 59 Issue 4 Pages 613-618

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Abstract

Preparation of metal supported La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) thin film cell for CO2 electrolysis was studied and by using selective reduction method of NiO–NiFe2O4, it was found that porous Ni–Fe(9:1) based substrate with ca.30% porosity was successfully prepared without large volume change resulting in the successful preparation of LaGaO3 dense thin film on metal substrate. By using Ce0.8Sm0.2O2 (SDC) thin film, Ni diffusion from Ni–Fe substrate was prevented. CO2 electrolysis was performed on the prepared LSGM/SDC on Ni–Fe porous substrate. When Sm0.5Sr0.5CoO3 (SSC) anode was prepared by screen print method using SSC powder, sintering of SSC powder was significantly occurred resulting in the large IR loss and overpotential. In contrast, when SSC anode layer was deposited by PLD (30 min) after LSGM/SDC layer deposition, tight contact between SSC anode and LSGM electrolyte film was obtained and the large CO2 electrolysis current of 3 and 0.5 A/cm2 were achieved at 973 and 773 K, respectively. Impedance analysis suggests that increased CO2 electrolysis current was obtained by decreased IR loss and electrode overpotential.

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© 2019 by The Iron and Steel Institute of Japan
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