Fluorite Ce0.8Sm0.2O2-δ porous layer coating to enhance the oxygen permeation behavior of a BaCo0.7Fe0.2Nb0.1O3-δ mixed conductor

Tai-he Wang; Wei-jia Song; Rong Li; Qiang Zhen

doi:10.1007/s12613-016-1283-3

Volume 23 Issue 6

Jun. 2016

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International Journal of Minerals, Metallurgy and Materials > 2016 > 23(6): 698-703. > DOI: 10.1007/s12613-016-1283-3

Tai-he Wang, Wei-jia Song, Rong Li, and Qiang Zhen, Fluorite Ce_0.8Sm_0.2O_2-δ porous layer coating to enhance the oxygen permeation behavior of a BaCo_0.7Fe_0.2Nb_0.1O_3-δ mixed conductor, Int. J. Miner. Metall. Mater., 23(2016), No. 6, pp.698-703. https://dx.doi.org/10.1007/s12613-016-1283-3

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Fluorite Ce_0.8Sm_0.2O_2-δ porous layer coating to enhance the oxygen permeation behavior of a BaCo_0.7Fe_0.2Nb_0.1O_3-δ mixed conductor

Tai-he Wang¹⁾,
Wei-jia Song¹⁾,
Rong Li^1), , and
Qiang Zhen^1,2), ,

Author Affilications

Nano-Science and Technology Research Center, Shanghai University, Shanghai, 200444, China
Materials Science and Engineering College, Shanghai University, Shanghai, 200072, China

Funds:

This work was financially supported by the National Natural Science Foundation of China (Nos. 51472156, 51072112, and 51311130110), the Innovation Foundation of Shanghai University (No. sdcx2012033), and the Training Funding Project for Young College Teachers of Shanghai. The authors also would like to acknowledge the Instrument Analysis Research Center, Shanghai University for the assistance in material characterization (SEM, TEM, and XRD).

Received: 15 November 2015; Revised: 03 January 2016; Accepted: 11 January 2016; Available Online: 09 June 2021

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Abstract

Abstract

Fluorite Ce_0.8Sm_0.2O_2-δ (SDC) nanopowder with a crystallite size of 15 nm was synthesized by a co-precipitation method. An SDC porous layer was coated onto a BaCo_0.7Fe_0.2Nb_0.1O_3-δ (BCFN) mixed conductor to improve its oxygen transport behavior. The results show that the SDC-coated BCFN membrane exhibits a remarkably higher oxygen permeation flux (J_O₂) than the uncoated BCFN in the partial oxidation of coke oven gas (COG). The maximum (J_O₂) value of the SDC-coated BCFN is 18.28 mL·min^-1·cm^-2 under a COG/air flux of 177 mL·min^-1/353 mL·min^-1 at 875℃ when the thickness of the BCFN membrane is 1 mm; this (J_O₂) value is 23% higher than that of the uncoated BCFN membrane. This enhancement is likely because of the higher oxygen ionic conductivity of SDC, which supplies oxygen vacancies and accelerates oxygen exchange on the membrane/coating layer/gas three-phase boundary.
- chemical stability,
- surface coating,
- oxygen permeable membrane,
- coke oven gas

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