Polyol Synthesis and Investigation of Ce1−xRExO2−x/2 (RE = Sm, Gd, Nd, La, 0 ≤ x ≤ 0.25) Electrolytes for IT‐SOFCs

Journal of the American Ceramic Society - Tập 98 Số 2 - Trang 501-509 - 2015
Göknur Dönmez1, Vedat Sarıboğa1, Tuba Gürkaynak Altınçekiç1, M.A. Faruk Öksüzömer1
1Department of Chemical Engineering Istanbul University Avcılar Istanbul 34320 Turkey

Tóm tắt

In this study, we aimed to examine the effect of dopant type and concentration on the ionic conductivity of ceria‐based electrolytes. Ceria electrolytes doped with samarium (SDC), gadolinium (GDC), neodymium (NDC), and lanthanum (LDC) for solid oxide fuel cells were prepared through the polyol process. Acetate compounds of cerium and dopants were used as starting materials, and triethylene glycol was used as a solvent. Prepared powders and pellets were characterized by TG/DTA, XRD, FTIR, SEM, EIS, and EDS techniques. The results of the TG/DTA and XRD indicated that a single‐phase fluorite structure formed at the relatively low calcination temperature of 500°C. The relative densities of the pellets were higher than 90% and these finding were supported by the SEM images. The lattice parameters of the samples increased with the dopant concentration. According to the electrochemical analysis results, the samples with maximum conductivity values were SDC‐20, GDC‐15, NDC‐15, and LDC‐15. The results of the impedance spectroscopy revealed that the SDC‐20 sample exhibited the highest ionic conductivity with a value of 4.29 × 10−2 S/cm at 800°C in air.

Từ khóa


Tài liệu tham khảo

10.1111/j.1551-2916.2008.02748.x

10.1111/j.1151-2916.1995.tb08820.x

10.1016/S0167-2738(97)00309-3

10.1016/j.ijhydene.2007.10.026

10.1149/1.1359198

10.1016/0167-2738(94)00242-K

10.1016/j.ceramint.2008.06.014

10.1111/j.1551-2916.2007.01923.x

10.1016/j.ijhydene.2009.10.093

10.1016/j.ceramint.2009.09.013

10.1016/j.jpowsour.2012.08.095

10.1016/j.materresbull.2005.08.012

10.1016/S1293-2558(02)01301-8

10.1016/j.ceramint.2009.12.005

10.1016/j.ceramint.2013.02.069

10.1016/j.jmmm.2009.05.020

10.1016/j.ceramint.2009.07.002

10.1111/jace.12373

10.1016/S0167-2738(02)00121-2

10.1016/j.ijhydene.2011.01.132

10.1016/j.jssc.2003.09.020

10.1016/j.ssi.2006.01.010

10.1016/j.actamat.2004.01.014

10.1016/j.jpowsour.2010.11.041

Brayner R., 2013, Nanomaterials: A Danger or a Promise?, A Chemical and Biological Perspective, 4, 10.1007/978-1-4471-4213-3

10.1111/j.1551-2916.2009.03273.x

10.1016/j.ssi.2007.12.069

10.1016/S0167-2738(98)00172-6

10.1016/j.ceramint.2011.11.006

10.1016/j.jpowsour.2007.08.093

10.1016/j.jallcom.2004.12.135

10.1016/S0955-2219(98)00327-6

10.1016/0167-2738(81)90313-1

10.1111/j.1151-2916.1998.tb02341.x

10.1016/S0167-2738(99)00319-7

10.1016/j.ceramint.2011.01.010

10.1111/j.1551-2916.2007.01531.x

10.1016/j.materresbull.2005.09.008

10.1016/S0378-7753(02)00625-0

10.1016/j.ijhydene.2012.11.044

10.1007/BF01022246

10.1016/j.mssp.2013.07.034

10.1021/cm970425t

10.1016/S1468-6996(03)00051-2