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Fabrication and Properties of Salt Doped Ba(Zr1-xCex)0.9Y0.1O2.95 Composite Proton Conductors

Author: DengYaPing
Tutor: GuoRuiSong
School: Tianjin University
Course: Materials Science
Keywords: BaZrO3 BaCeO3 Conductivity Complex phase proton conductor
CLC: O483
Type: Master's thesis
Year: 2010
Downloads: 77
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Abstract


BaZrO 3 protons conductors have good chemical stability and grain conductivity, but its poor sinterability (gt; 1700 ℃), low total conductivity ; BaCeO 3 sub- conductor substrate has a higher proton conductivity, but poor stability CO2/H2O atmosphere , prone to decomposition. In this paper, a detailed study on the basis of both the advantages and disadvantages to BaZrO 3 as the main body , prepared Y-doped BaZrO 3 -BaCeO 3 composite matrix material . Using ZnO as the sintering additive , reducing the proton conductor of the sintering temperature, increase the sintered density . Further select the appropriate inorganic salt as the second phase additive prepared cerium zirconium salts / inorganic composite proton conductor , and their various properties were characterized . High temperature solid phase prepared Ba (Zr1-xCex) 0.9 Y 0.1 O 2.95 (BZCY) (x = 0.1,0.2,0.3 ) series of powder , at 1600 ℃, heat 4h conditions, obtained BZCY series of proton conductors. Experimental results show that , x = 0.3 BZCY3 prepared at a high proton conductivity of the sample , 800 ℃ maximum conductivity of 5.87 × 10-3S/cm. ZnO as a sintering aid , explore the ZnO (≤ 4mol%) content on the BZCY3 sintering properties and electrical properties. Research shows that adding 2 mol% ZnO material can reduce the sintering temperature 150 ℃, and sintered density of 96% or more. Select NaCl salt as a second phase was prepared BZCY3-Z2/NaCl series composite proton conductor . The results show , 1400 ℃ sinter 6h, prepared by adding 10mol% NaCl BZCY3-Z2-Cl10 proton conductors have better proton conductivity , electrical conductivity (1.26 × 10-2S/cm) Greater BZCY3-Z2. At the same time as the second class of inorganic salts selected Na2SO4 prepared BZCY3-Z2/Na 2 SO 4 composite proton conductor showed that adding 20% Na2SO4 of BZCY3-Z2 / S20 proton conductor at 1370 ℃ / 2h after sintering under a relatively better performance. Two series of complex phase structure with a proton conductor remains a cubic perovskite structure , salt in a molten state located in the grain boundaries , to reduce grain boundary barrier has a promoting effect .

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Defects in Solids
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