Effect of Se modification on RuSey/C electrocatalyst for oxygen reduction with phosphoric acid

Title
Effect of Se modification on RuSey/C electrocatalyst for oxygen reduction with phosphoric acid
Authors
박희영유성종김수진이상영함형철성영은김수길황승준김형준조은애헨켄스마이어디억남석우임태훈장종현
Keywords
PEMFC; catalyst; phosphoric acid; ruthenium; high-temperature PEMFC; Se-modified-Ru catalyst; Oxygen reduction reaction
Issue Date
2013-02
Publisher
Electrochemistry communications
Citation
VOL 27, 46-49
Abstract
Carbon-supported Se-modified-Ru catalysts (RuSey/C) were synthesized, and their phosphate adsorption characteristics were evaluated using electrochemical techniques and in-situ X-ray absorption spectroscopy (XAS). When phosphoric acid was added, the ORR activity of unmodified Ru/C decreased by 26.8% because the active sites were blocked by electrochemical adsorption, as confirmed by CV. However, for RuSey/C, the ORR activity was enhanced with phosphoric acid (RuSe1.56/C: 63.8%), which indicates that the kinetics at each site increased to compensate for the site blocking effect. The XAS results demonstrated that, for RuSey/C, phosphoric acid molecules or phosphate anions primarily interacted with Se atoms, and the oxidation state of Ru atoms decreased. Therefore, it was concluded that the enhanced ORR kinetics originated from the decreased oxygen binding energy with larger electrostatic repulsion.
URI
http://pubs.kist.re.kr/handle/201004/44319
ISSN
13882481
Appears in Collections:
KIST Publication > Article
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