Park, Hee-Young Yoo, Sung Jong Kim, Soo Jin Lee, Sang-Young Ham, Hyung Chul Sung, Yung-Eun Kim, Soo-Kil Hwang, Seung Jun Kim, Hyoung-Juhn Cho, EunAe Henkensmeier, Dirk Nam, Suk Woo Lim, Tae-Hoon Jang, Jong Hyun 2024-01-20T13:02:54Z 2024-01-20T13:02:54Z 2021-09-01 2013-02 1388-2481 https://pubs.kist.re.kr/handle/201004/128416 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. (C) 2012 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE INC FUEL-CELLS ADSORPTION RUTHENIUM ALLOY SPECTROSCOPY CATALYSTS PLATINUM SELENIUM KINETICS SURFACE Effect of Se modification on RuSey/C electrocatalyst for oxygen reduction with phosphoric acid Article 10.1016/j.elecom.2012.10.032 1 ELECTROCHEMISTRY COMMUNICATIONS, v.27, pp.46 - 49 ELECTROCHEMISTRY COMMUNICATIONS 27 46 49 scie scopus 000316159200012 2-s2.0-84870346747 Electrochemistry Electrochemistry Article FUEL-CELLS ADSORPTION RUTHENIUM ALLOY SPECTROSCOPY CATALYSTS PLATINUM SELENIUM KINETICS SURFACE Se-modified-Ru catalyst Oxygen reduction reaction Phosphoric acid High temperature-PEMFC