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Ru-doped lanthanum strontium titanates for the anode of solid oxide fuel cells
Yoon, Heechul,Zou, Jing,Sammes, Nigel Mark,Chung, Jongshik Elsevier 2015 International journal of hydrogen energy Vol.40 No.34
<P><B>Abstract</B></P> <P>Lanthanum strontium titanate perovskite (LST) was doped with Ru (La<SUB>0.4</SUB>Sr<SUB>0.6</SUB>Ti<SUB>1−x</SUB>Ru<SUB>x</SUB>O<SUB>3−δ</SUB> (LSTR), x = 0.02, 0.05), and its properties were characterized by various methods for possible use as the anode material in solid oxide fuel cells (SOFCs). The thermal expansion coefficients of Ru-doped samples (10.2–10.3 × 10<SUP>−6</SUP> K<SUP>−1</SUP>) are about the same as LST (10.4 × 10<SUP>−6</SUP> K<SUP>−1</SUP>), which is similar to that of YSZ. It has been found that under a reducing atmosphere, doped Ru is precipitated from the structure. This decreases the total electrical conductivity and increases the ionic conductivity because of the increased number of B-site deficiencies created by the Ru precipitation. Impedance spectra measured with the buttons cells of the LSTRs-YSZ/YSZ/LSM-YSZ/LSM configuration reveal that the polarization resistance with the LST–YSZ anode increases with time (from 4.95 Ω cm<SUP>2</SUP> to 5.78 Ω cm<SUP>2</SUP> in 24 h of H<SUB>2</SUB> fuel atmosphere), whereas the resistance with Ru-doped LST–YSZ anodes decreases with time (from 4.87 Ω cm<SUP>2</SUP> and 4.17 Ω cm<SUP>2</SUP> to 4.06 Ω cm<SUP>2</SUP> and 2.74 Ω cm<SUP>2</SUP> for the LSTR0.02-YSZ and LSTR0.05-YSZ anodes, respectively). Accordingly, the final maximum power density at 850 °C also increases from 52 mW/cm<SUP>2</SUP> for LST–YSZ to 74 mW/cm<SUP>2</SUP> and 115 mW/cm<SUP>2</SUP> for the LSTR0.02-YSZ and LSTR0.05-YSZ anodes, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Ru doped LST perovskites are synthesized by EDTA-citrate method. </LI> <LI> The doped Ru affects the conduction behavior of LST in a reducing atmosphere. </LI> <LI> The overall performance is improved with Ru doping to LST anode. </LI> </UL> </P>
이찬우,노용래,정종식,백성기 ( Chanwoo lee,Yongrae Roh,Jongshik Chung,Sunggi Baik ) 한국센서학회 1996 센서학회지 Vol.5 No.3
We developed SAW gas sensor for monitoring SOx gas with high sensitivity. It was fabricated as a microsensor for detecting SOx gas by depositing sensing material on SAW device. As a detecting layer material, CdS was selected. Deposition of CdS in the form of thin films was carried out by the ultrasonic spray pyrolysis method using ultrasonic spray nozzle. Thin films with the uniform and large surface area for sensors were deposited. The stable pyrolysis environment provided by uniform and fine droplets formed by spray nozzle made it possble to obtain thin films with excellent quality. The minimum grain size of the CdS thin films was about 50 nm when deposited at 300℃. SAW gas sensors showed reasonable sensitivity and reproducibility. Further studies are required to investigate the interference of other gases to SOx gas detection.