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Title: Structural and oxygen-transport studies of double perovskites PrBa1-xCo2O5+delta (x=0.00, 0.05, and 0.10) toward their application as superior oxygen reduction electrodes
Authors: Dong, FF
Ni, M 
Chen, YB
Chen, DJ
Tade, MO
Shao, ZP
Issue Date: 2014
Source: Journal of materials chemistry A, 2014, v. 2, no. 48, p. 20520-20529
Abstract: Here we present a comprehensive study of oxygen-deficient double perovskites PrBa1-xCo2O5+delta (x = 0.00, 0.05, and 0.10) to exploit their potential use as cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Special attention is paid to the structure, oxygen concentration, and oxygen-ion transport properties, which are key factors related to the electrochemical performance. Based on the results obtained from a series of high-resolution structural analysis techniques, such as XRD, SAED, and HR-TEM, these double perovskite oxides possess tetragonal lattice symmetry and a stable crystal structure. According to the information obtained from iodometric titration, TGA, and O-2-TPD measurements, an increase in oxygen vacancy concentration in the lattice with an increasing Ba cation deficiency (x value) is demonstrated. Additionally, oxygen permeation flux and electrical conductivity relaxation (ECR) measurements illustrate an improved oxygen ionic conductivity, chemical bulk diffusion coefficient (D-chem) and chemical surface exchange coefficient (K-chem) with the introduction of Ba deficiency, likely due to the increase in the concentration of oxygen vacancies. Tests at 700 degrees C of the electrochemical performance based on symmetrical cells show area specific resistances (ASRs) of 0.045, 0.041, and 0.036 Omega cm(2) for PrBa1-xCo2O5+delta with x = 0.00, 0.05, and 0.10, respectively. These results are extremely promising; consequently, these oxides are worthy of further study and optimization as cathode materials for IT-SOFCs.
Publisher: Royal Society of Chemistry
Journal: Journal of materials chemistry A 
ISSN: 2050-7488
EISSN: 2050-7496
DOI: 10.1039/c4ta04372c
Rights: © The Royal Society of Chemistry 2014
This is an Author's Accepted Manuscript of the following article: Dong, F., Ni, M., Chen, Y., Chen, D., Tadé, M. O., & Shao, Z. (2014). Structural and oxygen-transport studies of double perovskites PrBa 1− x Co 2 O 5+ δ (x= 0.00, 0.05, and 0.10) toward their application as superior oxygen reduction electrodes. Journal of Materials Chemistry A, 2(48), 20520-20529, which has been published in final form at:
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