Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Wipf, David
Committee Member
Thomas MaGee, Thomas Gloria
Committee Member
Xia, Kang
Date of Degree
12-15-2007
Original embargo terms
MSU Only Indefinitely
Document Type
Graduate Thesis - Campus Access Only
Major
Chemistry
Degree Name
Master of Science
College
College of Arts and Sciences
Department
Department of Chemistry
Abstract
The tip generation/substrate collection mode (TG/SC) of scanning electrochemical microscopy (SECM) was used to study the ORR reactivity on Pt catalysts in sulfuric acid solution. The SECM reactivity image and the photographic image of different single crystalline regions of the etched Pt electrode correlated well. The electron backscatter diffraction (EBSD) image of Pt confirmed the surface single crystalline orientation. The image resolution is improved by employing smaller tip-substrate distance. The kinetics of the ORR on Pt surface was also studied at -15 - 30 C by means of the rotating disk voltammetry techniques. The calculated Tafel slopes for 0.1 m and 0.9 m HClO4 changed with decreasing temperature, indicating lower kinetics at low temperature. Peroxide is produced at potentials below 0 V vs SCE.
URI
https://hdl.handle.net/11668/16339
Recommended Citation
Sun, Xiaojing, "Study of the oxygen reduction reaction on platinum with scanning electrochemical microscopy and rotating disk voltammetry" (2007). Theses and Dissertations. 4138.
https://scholarsjunction.msstate.edu/td/4138
Comments
rotating ring-disk electrode||scanning electrochemical microscopy||oxygen reduction reaction||rotating disk electrode