Synthesis and Characterization of Non-noble Metal Catalyst in Oxygen Reduction Reaction of Fuel Cells
Date Issued
2012
Date
2012
Author(s)
Tu, Meng-Hsiu
Abstract
The performance of fuel cell mainly determine by activity of catalyst for fuel decomposition. It’s usually using Pt-based catalyst due to high efficiency. However, Pt is a noble metal; expensive remained a major problem for development fuel cell commercialization. Recent research in cathode catalyst of fuel cell focused on non-noble metal catalyst substitution for Pt-based catalyst, it’s one of solutions to overcome this obstacle. However oxygen reduction reaction (ORR) activity of non-noble metal catalyst is lower than Pt-based catalyst. Thus, improve activity of non-noble metal catalyst become an important issue. Generally, catalytic structure and activity affect by heat treatment which will further influence nitrogen-doped structure in catalyst surface. Different types of nitrogen have different activity for oxygen reduction. Due to the role of heat treatment and carbon support are not fully understood yet, research on these two factors will assist in development fuel cell.
In the present study, synthesis catalyst by impregnation method with various heat temperatures in ammonia condition. Used several analytic techniques to optimize synthesis factors and study formation mechanism with 0 dimension and 2 dimension carbon support. Both catalytic series used X-ray powder diffraction to prove crystal structure. X-ray absorption spectroscopy by using synchrotron radiation was applied for oxidation number of iron. Practical size and morphology studied by transmission electron microscopy. X-ray photoelectron spectroscopy characterized structure of nitrogen in catalyst. Surface area analyzer measured specific surface area. ORR and methanol poison tested by cyclic voltammery. Confirm iron nitride of catalyst change with temperature increase. The best ORR activity is Fe2N phase from 700℃ heat treatment. The carbon support dimension induces diverse loading mode, furthermore control practical size and catalytic activity.
Subjects
Fuel cell
Oxygen reduction reaction
Non-noble metal catalyst
Graphene
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
index.html
Size
23.27 KB
Format
HTML
Checksum
(MD5):ce0c8003a3f54a05c6a0a600c5347068