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Fabrication and Characterization of Composite Electrolyte Materials Based on Ce0.85Sm0.15O1.925 and BaCe0.8Y0.2O2.9

Author: YuJi
Tutor: LiuXiaoMei
School: Jilin University
Course: Condensed Matter Physics
Keywords: The solid oxide fuel cell Composite electrolyte Conductivity Power density Open circuit voltage
CLC: TM911.4
Type: Master's thesis
Year: 2010
Downloads: 71
Quote: 1
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Abstract


The preparation of the papers issued by the aerobic ion / proton mixing new conductive solid electrolyte . This composite electrolyte is oxygen - ion electrolyte material Ce0.85Sm0.15O1.925 (SDC) as a substrate, a proton electrolyte material BaCe0.8Y0.2O3-δ (BCY20) as a dispersed phase . XRD spectra , SEM , impedance spectroscopy , and single- cell test experiment to study the microstructure and electrical properties of this new composite electrolyte material . This article samarium doped ceria (SDC) cerium and yttrium -doped barium (BCY20) composite preparation the SDC-BCY20 composite electrolyte material . Press the SDC and BCY20 quality were prepared for 95:5,85:15,75:25,65:35 four composite electrolyte , referred to as SB95, SB85, SB75 and SB65 . The impedance spectroscopy and DC conductivity test results show that the composite electrolyte material SB95 , SB85 the conductivity than in the temperature range of 300-800oC SDC high . The single cells are prepared BaCo0.7Fe0.22Nb0.08O3-δ as a cathode material , Ni0.9Cu0.1-SDC as the anode material . The single cell test results show that single cell preparation SB95 and SB85 composite electrolyte outperforms SDC and BCY20 single cell . Prepared in the composite electrolyte material are higher than the open circuit voltage of the battery cell with the SDC to prepare a single cell . Wherein the output performance of the composite electrolyte conductivity and single cell of the SB95 , SB95 single cell maximum output power density in 750oC for 0.526W/cm2 . Select Sample SB85, and analysis of the performance characteristics of the study samples under different sintering temperature (1250oC, 1350oC, 1400oC and 1450oC) . Experimental results show that has the highest conductivity , SB85 1400oC sintered in 800oC (0.04642 S · cm-1) and the cell output power density (0.478 W/cm2). 1250oC sintered SB85 electrolyte sheet is not dense , the conductivity , the output power density and the open-circuit voltage of the single cells are low.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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