Fundamental studies of perovskite related oxide thin films for oxygen electrocatalysis at intermediate temperatures
Name
897126535-MIT.pdf
Description
Full printable version
Size
28.3 MB
Format
Adobe PDF
Checksum (MD5)
7ce96a483e6bdfcacd93a95d347f5f0e
Author(s)
Lee, Dongkyu, Ph. D. Massachusetts Institute of Technology
Advisor(s)
Yang Shao-Horn.
Date Issued
2014
Publisher
Massachusetts Institute of Technology
Abstract
Discovering highly active and stable catalysts for electrochemical energy conversion and storage is essential to envision a new generation of renewable energy applications. Mixed ionic and electronic conductors (MIECs) such as Lai.xSrxCoO₃-[delta] (LSC₁₁₃) and Lai-xSrxCo1-yFeyO3-[delta] (LSCF₁₁₃) are currently utilized for applications including oxygen permeation membranes and solid oxide fuel cells (SOFCs), but alternative materials with higher catalytic activity and stability are required for intermediate temperature (500 - 700 °C) oxide electrocatalysts. In this thesis, two promising strategies, 1) Ruddlesden-Popper (RP) oxides and 2) surface decoration on the MIEC oxides are proposed to design highly active oxide materials and improve the fundamental understanding of the oxygen electrocatalysis at intermediate temperature. The oxygen surface exchange kinetics of a-axis-oriented La2NiO4+[delta] (LNO) thin films increases with decreasing film thickness. Increasing volumetric strains in the LNO films at elevated temperatures are correlated with increasing surface exchange kinetics and decreasing film thickness. Volumetric strains may alter the formation energy of interstitial oxygen and influence on the surface oxygen exchange kinetics of the LNO films. The effect of strontium (Sr) substitution on the oxygen electrocatalysis of RP oxides is also investigated using La2-xSrxNiO4+/-[delta] (LSNO, 0.0
Description
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references.
Subjects
Mechanical Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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