TY - JOUR

T1 - Structural studies of pr nickelate-cobaltite-Y-doped ceria nanocomposite

AU - Sadykov, V. A.

AU - Eremeev, N. F.

AU - Vinokurov, Z. S.

AU - Shmakov, A. N.

AU - Kriventsov, V. V.

AU - Lukashevich, A. I.

AU - Krasnov, A. V.

AU - Ishchenko, A. V.

PY - 2017/3/1

Y1 - 2017/3/1

N2 - Being stable to carbonization, praseodymium nickelates-cobaltites and their nanocomposites are promising materials for intermediate-temperature solid oxide fuel cells (IT SOFC) cathodes and oxygen separation membranes. This work aims to elucidate specificity of their structure and transport properties on the basis of synchrotron radiation studies. PrNi0.5Co0.5O3-δ (PNC), Ce0.9Y0.1O2-δ (YDC), Ce0.65Pr0.25Y0.1O2-δ (YPDC), CeO2 and PrO2-δ powders were synthesized with the Pechini technique. PNC - YDC nanocomposite was obtained via ultrasonic dispersion. The materials were characterized in in situ synchrotron XRD analyses with unit cell volume relaxation (CVR) and extended Xray absorption fine structure (EXAFS). Bulk and surface oxygen mobility and reactivity were studied with O2 temperature- programmed desorption and CVR methods. Strong cation redistribution between domains was revealed. Fast oxygen diffusion and exchange in the PNC - YDC nanocomposite were shown to be determined by developed interface and variation in the Pr3+/4+ cations' charge in the Y-Pr-Ce-O domains. Selected compositions were deposited as functional layers in asymmetric membranes for oxygen separation. According to the test results, the membranes demonstrated promising performance.

AB - Being stable to carbonization, praseodymium nickelates-cobaltites and their nanocomposites are promising materials for intermediate-temperature solid oxide fuel cells (IT SOFC) cathodes and oxygen separation membranes. This work aims to elucidate specificity of their structure and transport properties on the basis of synchrotron radiation studies. PrNi0.5Co0.5O3-δ (PNC), Ce0.9Y0.1O2-δ (YDC), Ce0.65Pr0.25Y0.1O2-δ (YPDC), CeO2 and PrO2-δ powders were synthesized with the Pechini technique. PNC - YDC nanocomposite was obtained via ultrasonic dispersion. The materials were characterized in in situ synchrotron XRD analyses with unit cell volume relaxation (CVR) and extended Xray absorption fine structure (EXAFS). Bulk and surface oxygen mobility and reactivity were studied with O2 temperature- programmed desorption and CVR methods. Strong cation redistribution between domains was revealed. Fast oxygen diffusion and exchange in the PNC - YDC nanocomposite were shown to be determined by developed interface and variation in the Pr3+/4+ cations' charge in the Y-Pr-Ce-O domains. Selected compositions were deposited as functional layers in asymmetric membranes for oxygen separation. According to the test results, the membranes demonstrated promising performance.

KW - Nanocomposites

KW - Oxygen mobility

KW - Oxygen separation membranes

KW - Performance

KW - Synchrotron radiation

KW - DESIGN

KW - CATHODES

KW - ELECTRICAL-PROPERTIES

KW - oxygen mobility

KW - nanocomposites

KW - performance

KW - OXYGEN NONSTOICHIOMETRY

KW - ABSORPTION

KW - synchrotron radiation

KW - OXIDE FUEL-CELLS

KW - SR

UR - http://www.scopus.com/inward/record.url?scp=85017030469&partnerID=8YFLogxK

U2 - 10.4416/JCST2016-00099

DO - 10.4416/JCST2016-00099

M3 - Article

AN - SCOPUS:85017030469

VL - 8

SP - 129

EP - 140

JO - Journal of Ceramic Science and Technology

JF - Journal of Ceramic Science and Technology

SN - 2190-9385

IS - 1

ER -