A solid state reaction method was used to prepare the perovskite-structured compounds BaZr1-xYxO3-α(x=0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3). The X-ray diffraction (XRD) pattern indicated that the target perovskite phases were obtained. With increasing Y con-centration the unit cell parameters of BaZr1-xYxO3-αsamples were expanded, and Y doping became more difficult. However, high synthesis temperature is helpful to promote Y doping. The SEM results showed that the samples exhibited poor sinterability with in-creasing Y-doping content. Thermal gravimetric (TG) curves analysis showed the more mass decreasing of BaZr1-xYxO3-α(0≤x≤0.3) samples at high temperature with more Y doping and more proton introducing. The electrochemical impedance spectra (EIS) of specimens showed that conductivities of BaZr1-xYxO3-α(0≤x≤0.3) increased with increasing temperature from 300 to 900 °C in wet air. At 900 °C, the conductivity of BaZr1-xYxO3-α(0≤x≤0.3) first increased with increasing doped amount of Y, and reached the high-est value of 1.07×10-3 S/cm when x was 0.2, then decreased gradually with further increasing Y content. At 600 °C, BaZr0.75Y0.25O3-αdisplayed the highest conductivity, while the conductivity of BaZr0.7Y0.3O3-αwas the highest at 300 °C. The results indicated that there should be an optimum Y doping concentration yielding the highest conductivity at a constant temperature, and the optimum Y doping concentration should increase in the humidity atmosphere as the temperature decreases. So increasing the Y-doping concen-tration is helpful to improve the conductivities of BaZr1-xYxO3-αmaterials at low temperature.
参考文献
| [1] | Jarry, A.;Quarez, E.;Kravchyk, K.;Joubert, O..Rare earth effect on conductivity and stability properties of doped barium indates as potential proton-conducting fuel cell electrolytes[J].Solid state ionics,2012:11-14. |
| [2] | Bi, L.;Fabbri, E.;Sun, Z.;Traversa, E. .Sinteractivity, proton conductivity and chemical stability of BaZr _(0.7)In_(0.3)O_(3-δ) for solid oxide fuel cells (SOFCs)[J].Solid state ionics,2011(1):59-64. |
| [3] | Xie K;Yan R Q;Chen X R;Dong D H, Wang S L, Liu X Q, Meng G Y .A new stable BaCeO3-based proton con-ductor for intermediate-temperature solid oxide fuel cells[J].Journal of Alloys and Compounds,2009,472:551. |
| [4] | Li Y;Ding Y S;Hu J T;Wang C Z .Study on the behavior of hydrogen at steel heat treatment process with proton conductor sensor[J].Acta Metall Sinica,2011,47(05):553. |
| [5] | Chen, X.;Rieth, L.;Miller, M.S.;Solzbacher, F. .Comparison of Y-doped Bazro_3 thin films for high temperature humidity sensors by RF sputtering and pulsed laser deposition[J].Sensors and Actuators, B. Chemical,2010(1):173-180. |
| [6] | Hübert, T.;Boon-Brett, L.;Black, G.;Banach, U. .Hydrogen sensors - A review[J].Sensors and Actuators, B. Chemical,2011(2):329-352. |
| [7] | Tanaka, M;Katahira, K;Asakura, Y;Ohshima, T .Hydrogen pump using a high-temperature proton conductor for nuclear fusion engineering applications[J].Solid state ionics,2010(3/4):215-218. |
| [8] | Sakai T;Matsumoto H;Yamamoto R;Kudo T, Okada S, Watanabe M, Hashimoto S, Takamura H, Ishihara T .Per-formance of palladium electrode for electrochemical hy-drogen pump using strontium-zirconate-based proton con-ductors[J].IONICS,2009,15:665. |
| [9] | Marnellos G;Stoukides M .Ammonia synthesis at atmos-pheric pressure[J].SCIENCE,1998,282:98. |
| [10] | Xie K;Ma Q L;Lin B;Jiang Y Z, Gao J F, Liu X Q, Meng G Y .An ammonia fuelled SOFC with a BaCe0 9Nd0.1O3-δthin electrolyte prepared with a suspension spray[J].J Power Sources,2007,170:38. |
| [11] | Li Y;Ding Y S;Wang C Z .Solid-state synthesis and prop-erties of Y-doped BaCeO3[J].Materials Science Forum,2010,654-656:2014. |
| [12] | Zhong ZM .Stability and conductivity study of the BaCe0.9-xZrxY0.1O2.95 systems[J].Solid state ionics,2007(3/4):213-220. |
| [13] | Li Y;Lu S L;Wang C Z .Preparation and properties of CaZr1-xInxO3-α proton conductor[J].Journal Inorg Mater,2012,27(04):427. |
| [14] | Li Y;Ding Y S;Cui S G;Wang C Z .Preparation and elec-tical properties of Sc-doped CaZrO3[J].Acta Metall Sinica,2012,48(05):575. |
| [15] | Kreuer KD. .ON THE DEVELOPMENT OF PROTON CONDUCTING MATERIALS FOR TECHNOLOGICAL APPLICATIONS[J].Solid state ionics,1997(1/4):1-15. |
| [16] | Katahira K.;Shimura T.;Iwahara H.;Kohchi Y. .Protonic conduction in Zr-substituted BaCeO3[J].Solid state ionics,2000(1/2):91-98. |
| [17] | Shirpour, M.;Merkle, R.;Maier, J..Evidence for space charge effects in Y-doped BaZrO _3 from reduction experiments (Conference Paper)[J].Solid state ionics,2012:1-5. |
| [18] | Xu X;Tao S;Irvine J T S .Proton conductivity of potas-sium doped barium zirconates[J].Journal of Solid State Chemistry,2010,183:93. |
| [19] | Fabbri, E.;Pergolesi, D.;Licoccia, S.;Traversa, E. .Does the increase in Y-dopant concentration improve the proton conductivity of BaZr_(1-x)Y_xO_3_(-δ) fuel cell electrolytes?[J].Solid state ionics,2010(21/22):1043-1051. |
| [20] | Iguchi, F;Tsurui, T;Sata, N;Nagao, Y;Yugami, H .The relationship between chemical composition distributions and specific grain boundary conductivity in Y-doped BaZrO3 proton conductors[J].Solid state ionics,2009(6/8):563-568. |
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