Loading…
Effect of Heat Treatment on Activity of Fe/N/C Catalyst Prepared by Hemin for Oxygen Reduction Reaction
Carbon-supported Fe/N/C catalysts synthesized from hemin have recently shown high oxygen reduction reaction (ORR) activity for the cathode use of fuel cells. In previous studies, such hemin-based catalysts were usually prepared by heat treatment at temperatures ranging from 600 to 900°C at a fixed c...
Saved in:
Published in: | ECS transactions 2014-09, Vol.61 (29), p.31-37 |
---|---|
Main Authors: | , , , , |
Format: | Article |
Language: | English |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | Carbon-supported Fe/N/C catalysts synthesized from hemin have recently shown high oxygen reduction reaction (ORR) activity for the cathode use of fuel cells. In previous studies, such hemin-based catalysts were usually prepared by heat treatment at temperatures ranging from 600 to 900°C at a fixed calcination time of about 2 hours. In this study, we compare the ORR activity of hemin-based catalyst prepared by different calcination times: 100 s, 30 min, or 2 hrs. The results show that the calcination time dependence of ORR activity dynamically changes depending on the calcination temperature. When the heat treatment temperature is 600°C, the ORR activity consistently improves as the calcination time increases from 100 s to 2 hrs. At 750 and 900°C, first the ORR activity improves and then plateaus or decreases with the increase of the calcination time. The optimum calcination time of our catalyst seems to exist below 30 minutes at 750°C. These calcination time dependences are explained by the different rate of the formation of FeNx ORR active site and its extinction depending on the calcination temperature. |
---|---|
ISSN: | 1938-5862 1938-6737 |
DOI: | 10.1149/06129.0031ecst |