LaFexCo(1G??x)O3 Thin-Film Oxygen Reduction Catalysts Prepared Using Spray Pyrolysis without Conductive Additives
creator
Dervishogullari, Dilek (Class of 2016)
creator
Sharpe, Christopher A. (Class of 2018)
creator
Sharpe, Lee R. (Faculty/Staff)
Title
LaFexCo(1G?AEx)O3 Thin-Film Oxygen Reduction Catalysts Prepared Using Spray Pyrolysis without Conductive Additives
supporting host
Grinnell College. Chemistry
Index Date
2017
Date Issued
43047
Publisher
Grinnell College
Genre
Essays
Digital Origin
born digital
Extent
7 pages
Media Type
application/pdf
description
LaFexCo(1G?AEx)O3 thin films were prepared on fluorine-doped tin oxide conducting glass substrates by spray pyrolysis without any conductive additives and evaluated for their ability to catalyze the oxygen reduction reaction. Onset potential and current density were found to be comparable to platinum, and the resulting crystallite size was on the order of 20 nm. Coordination of the precursor metal ions by citrate was found not to be advantageous. Results from multiple scan linear sweep voltammetry suggest lattice oxide saturation during reduction of oxygen and lattice oxide depletion upon water oxidation. The color of the best-performing composition changes dramatically between 1.2 and G?AE1.15 V versus saturated calomel electrode, so X-ray photoelectron spectra of the fully oxidized and reduced films were compared, demonstrating that cobalt in the film changes oxidation state. Performance of the films as a function of iron-to-cobalt ratio is consistent with what others have reported in the literature, indicating that spray pyrolysis is an efficient method to prepare and evaluate new catalytic materials.
Language
English
Topic
Cobalt
Topic
Electrochemistry
Topic
Ferroelectric thin films
Topic
Iron
Temporal
Two thousand seventeen, A.D.
Classification
QD
Related Item
Faculty Scholarship
Related Item
Student Scholarship
Related Item
Scholarship at Grinnell
Related Item
Digital Grinnell
Identifier (hdl)
http://hdl.handle.net/11084/26882
Identifier (local)
grinnell:26882
Access Condition
Copyright to this work is held by the author(s), in accordance with United States copyright law (USC 17). Readers of this work have certain rights as defined by the law, including but not limited to fair use (17 USC 107 et seq.).