Enhancing grain boundary ionic conductivity in mixed ionic–electronic conductors

Lin, Ye; Fang, Shumin; Su, Dong; Brinkman, Kyle S.; Chen, Fanglin

doi:10.1038/ncomms7824

Title: Enhancing grain boundary ionic conductivity in mixed ionic–electronic conductors

Journal Article · Fri Apr 10 00:00:00 EDT 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms7824· OSTI ID:1258650

Lin, Ye ^[1]; Fang, Shumin ^[1];

^[2]; Brinkman, Kyle S. ^[3];

^[1]

Univ. of South Carolina, Columbia, SC (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Clemson Univ., SC (United States)

Mixed ionic–electronic conductors are widely used in devices for energy conversion and storage. Grain boundaries in these materials have nanoscale spatial dimensions, which can generate substantial resistance to ionic transport due to dopant segregation. Here, we report the concept of targeted phase formation in a Ce_0.8Gd_0.2O_2₋δ–CoFe₂O₄ composite that serves to enhance the grain boundary ionic conductivity. Using transmission electron microscopy and spectroscopy approaches, we probe the grain boundary charge distribution and chemical environments altered by the phase reaction between the two constituents. The formation of an emergent phase successfully avoids segregation of the Gd dopant and depletion of oxygen vacancies at the Ce_0.8Gd_0.2O_2₋δ–Ce_0.8Gd_0.2O_2₋δ grain boundary. This results in superior grain boundary ionic conductivity as demonstrated by the enhanced oxygen permeation flux. Lastly, this work illustrates the control of mesoscale level transport properties in mixed ionic–electronic conductor composites through processing induced modifications of the grain boundary defect distribution.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Heterogeneous Functional Materials Center (HeteroFoaM); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001061; AC02-98CH10886; SC-0011270; DMR-1210792

OSTI ID:: 1258650

Journal Information:: Nature Communications, Vol. 6; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 158 works

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