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Nien S.H.,National Sun Yat - sen University | Hsu C.S.,Kaohsiung Municipal Chung Cheng Industrial High School | Chang C.L.,Institute of Nuclear Energy Research of Taiwan | Hwang B.H.,National Sun Yat - sen University
Fuel Cells | Year: 2011

Solid oxide fuel cells (SOFCs) based on the proton conducting BaZr 0.1Ce0.7Y0.2O3- (BZCY) electrolyte were prepared and tested in 500-700°C using humidified H2 as fuel (100 cm3 min-1 with 3% H2O) and dry O 2 (50 cm3 min-1) as oxidant. Thin NiO-BZCY anode functional layers (AFL) with 0, 5, 10 and 15 wt.% carbon pore former were inserted between the NiO-BZCY anode and BZCY electrolyte to enhance the cell performance. The anode/AFL/BZCY half cells were prepared by tape casting and co-sintering (1,300°C/8 h), while the Sm0.5Sr 0.5CoO3-(SSC) cathodes were prepared by thermal spray deposition. Well adhered planar SOFCs were obtained and the test results indicated that the SOFC with an AFL containing 10 wt.% pore former content showed the best performance: area specific resistance as low as 0.39 ω cm2 and peak power density as high as 0.863 W cm-2 were obtained at 700°C. High open circuit voltages ranging from 1.00 to 1.12 V in 700-500°C also indicated negligible leakage of fuel gas through the electrolyte. © 2011 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Chang C.L.,National Sun Yat - sen University | Chang C.L.,Institute of Nuclear Energy Research of Taiwan | Chu T.F.,National formosa University | Hsu C.S.,Kaohsiung Municipal Chung Cheng Industrial High School | Hwang B.H.,National Sun Yat - sen University
Journal of the European Ceramic Society | Year: 2012

Sm 0.5Sr 0.5CoO 3-δ (SSC) cathode films were deposited on CGO (Gd 0.1Ce 0.9O 1.95) electrolyte substrates by electrostatic spray deposition to prepare SSC/CGO/SSC symmetrical cells. Deposition parameters were changed systematically to examine their effects on film microstructure and electrode performance. A set of deposition parameters including a 0.01M precursor solution containing metal nitrates in a mixture solvent of de-ionized water (0.6vol%), ethanol (1.5vol%) and diethyl butyl carbitol (97.9vol%), a flow rate of 6ml/h for precursor solution, a deposition temperature of 350°C and an imposed electric field of 10kV/3cm was identified for preparation of films with a highly porous reticular structure. The superior performance of a reticular SSC electrode was evidenced by its low interfacial resistances of 0.275 and 0.018Ωcm 2 measured in 500 and 700°C, respectively. These values were one-half to one order of magnitude smaller than that of the screen-printed or slurry-painted electrodes. © 2011 Elsevier Ltd. Source


Hsiao T.-W.,National Sun Yat - sen University | Hsu P.-H.,National Sun Yat - sen University | Chang C.-L.,Institute of Nuclear Energy Research of Taiwan | Hsu C.-S.,Kaohsiung Municipal Chung Cheng Industrial High School | Hwang B.-H.,National Sun Yat - sen University
Fuel Cells | Year: 2015

Cathodes with PrBaCo2O5+δ (PBC) and Sm0.5Sr0.5CoO3-δ (SSC) infiltrated on Ce0.9Gd0.1O1.95 (CGO) backbones are prepared using metal nitrates as precursors and ethanol as wetting agent. Electrochemical impedance spectra (EIS) are measured from cathode/CGO/cathode symmetrical cells in 400-650°C under humidified air. The results indicate that interfacial area specific resistance (ASR) value decreases and then increases with infiltrate loading and minimum values occur at 50 wt.% loading (relative to sum of infiltrate and backbone) for both PBC and SSC infiltrates. ASR values of PBC infiltrated cathodes are lower than that of corresponding SSC infiltrated cathodes in general, and in particular ASR values as low as 1.36 × 10-2 and 2.27 × 10-2 Ω cm2 are obtained at 650°C in air for 50 wt.% PBC and 50 wt.% SSC infiltrated cathodes, respectively. Conductivity values of CGO electrolyte increase with infiltrate loading and agree with the reported values when the loading reaches 50 wt.%. Copyright © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Chang C.-L.,National Sun Yat - sen University | Chang C.-L.,Institute of Nuclear Energy Research of Taiwan | Hsu C.-S.,Kaohsiung Municipal Chung Cheng Industrial High School | Huang J.-B.,National Sun Yat - sen University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

Sm0.5Sr0.5CoO3 - δ (SSC) nanowires with 20-100 nm diameters were prepared by electrospinning. Subsequent calcination and fragmentation by ultrasonic vibration rendered short nanofibers with 10-40 nm diameters and tens to hundreds nm lengths. Slurry containing SSC nanofibers was screen-printed on CGO (Ce0.9Gd0.1O1.95) disks to prepare SSC/CGO/SSC symmetrical cells. Similar symmetrical cells were also prepared using SSC powder derived from the glycine-nitrate combustion method for comparison. AC impedance measurement of the symmetrical cells under open circuit condition revealed that the electrolyte/nanofiber-electrode interfacial area specific resistances (ASR) were 0.533, 0.187, 0.061, 0.026 and 0.010 Ω cm2 at 500, 550, 600, 650 and 700 °C, respectively. These values were several to more than ten times smaller than the corresponding values of the powder cathodes. The large surface area of the nanofibers provide a large number of reaction sites for oxygen reduction and hence low ASRs. A NiO-CGO/CGO/SSC (nanofiber) single cell was also prepared and tested using humidified H2 as fuel and air as oxidant, the peak power output at 700 °C is 1.09 W cm- 2. © 2014 Elsevier Inc. All rights reserved. Source


Huang J.B.,National Sun Yat - sen University | Chang C.L.,National Sun Yat - sen University | Hsu C.S.,Kaohsiung Municipal Chung Cheng Industrial High School | Hwang B.H.,National Sun Yat - sen University
Fuel Cells | Year: 2010

Dense and thin electrolyte films are desirable for solid oxide fuel cells (SOFCs) because of their low gas leakage and low ohmic resistances. This work aims at the preparation of thin dense Gd-doped ceria (CGO) electrolyte films using a cost-effective deposition method in ambient atmosphere-electrostatic spray deposition (ESD). The deposition parameters such as deposition temperature, concentration and flow rate of precursor solution were changed systematically to examine their effects on film morphology and hence electrochemical performance. While the film morphology was examined by a scanning electron microscope, the electrochemical performance was revealed by measuring open circuit voltages (OCVs) of NiO-CGO/CGO/Ba0.5Sr 0.5Co0.8Fe0.2O3-δ (BSCF) cells in 500-700 °C with humidified hydrogen as fuel and air as oxidant. The results show that a CGO film of 25 μm thick obtained at a deposition temperature of 400 °C, a precursor solution flow rate of 6 ml h-1 and a precursor concentration of 0.3 M was dense with very few isolated pores and the OCV of the associated cell was 0.915 V at 500 °C. This implies that the CGO film has negligible gas leakage and ESD is a promising method for preparing thin dense electrolyte films for SOFCs. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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