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Novel CeO2 Based Electrolyte for Low and Intermediate Temperature Solid Oxide Fuel Cells

Author: ZuoZuo
Tutor: WangChengYang
School: Tianjin University
Course: Chemical processes
Keywords: Low-temperature solid oxide fuel cell (LITSOFC) Samarium oxide -doped ceria (SDC) Composite electrolyte Conductivity Concentration cell Wagner dc polarization
CLC: TM911.4
Type: PhD thesis
Year: 2010
Downloads: 219
Quote: 1
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In low-temperature solid oxide fuel cell (LITSOFC) will reduce the operating temperature of SOFC to 400 ~ 800 ℃, solve the traditional SOFC due to the high temperature material selection, preparation, and the SOFC research in recent years the field of hot. This article from an oxygen ion / proton conduction new CeO2-low temperature SOFC composite electrolyte material as a starting point to explore the preparation technology, structure, electrical properties, and finally discuss the possible conduction mechanism. Were prepared by co-precipitation method and combustion method of Ce 0.8 Sm 0.2 O 1.9 (SDC) nano-powder, and construct a single battery. Battery performance tests show that, due to the the SDC conductivity is not big enough and Ce 4 H 2 reduction, limiting the SDC-based fuel cell open circuit voltage and power density improvement. SDC and (Li / Na) 2 CO 3 (Li / K) 2 CO 3 (K / Na) 2 CO 3 SDC-carbonate composite electrolytes were prepared. Carbonates exist in amorphous form and coated on the SDC particles form a stable complex. AC impedance test carried out under an oxidizing atmosphere and reducing atmosphere different carbonate content of the composite electrolyte. Atmosphere CO 2 O 2 the H 2 and the H 2 O content of conductivity were also the inspection. The results show that the composite electrolyte conductivity as compared with pure SDC have significantly increased, and significantly increased near the melting point; transition temperature is lower than the conductivity conductance increase from composite enhancement effect, higher than the conductivity of the transition temperature from the molten state The carbonate complex super ion conductive phase change the role of co-contribution. AC conductance study does not fully characterize the conductivity of the oxygen ions and protons, so construct the composite electrolyte battery cell, the fuel cell environment (hydrogen / air) under the DC conductive. The results showed that the carbonate content of 20 wt% of a fuel cell having the highest open-circuit voltage and power density at 650 ° C the maximum power density of up to 580mW cm -2 . Fuel cell atmosphere the dc conductivity trend exchanges conductivity consistent description of the oxygen ion / proton intrinsic conduction characteristics of carbonate ion activity related. Measured with gas concentration cell and have the number of the ion transport of the composite electrolyte in a wet oxidizing atmosphere, the results show that the conductivity mainly by oxygen ions. DC polarization method measured the oxygen ion conductivity of the composite electrolyte in oxygen and hydrogen proton conductivity, that oxygen ion conductivity capacity is lower than the proton conduction ability. To investigate the mechanism of conductive composite electrolyte. That the composite electrolyte oxygen ion conduction by oxygen vacancies in the oxide bulk phase and two-phase interface, the proton in the two-phase interface by the formation of an intermediate state HCO CO 3 2 - < sub> 3 - conduction. The composite conductivity after the size and nature of whether communicating bulk phase and interface and the oxides and carbonates are formed in the electrolyte.

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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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