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

Hee Young Park; Sung Jong Yoo; Soo Jin Kim; Sang Young Lee; Hyung Chul Ham; Yung Eun Sung; Soo Kil Kim; Seung Jun Hwang; Hyoung Juhn Kim; Eunae Cho; Dirk Henkensmeier; Suk Woo Nam; Tae Hoon Lim; Jong Hyun Jang

doi:10.1016/j.elecom.2012.10.032

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

Hee Young Park, Sung Jong Yoo, Soo Jin Kim, Sang Young Lee, Hyung Chul Ham, Yung Eun Sung, Soo Kil Kim, Seung Jun Hwang, Hyoung Juhn Kim, Eunae Cho, Dirk Henkensmeier, Suk Woo Nam, Tae Hoon Lim, Jong Hyun Jang

GREEN SCHOOL (Graduate School of Energy and Environment)

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Carbon-supported Se-modified-Ru catalysts (RuSe_y/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 RuSe_y/C, the ORR activity was enhanced with phosphoric acid (RuSe_1.56/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 RuSe_y/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.

Original language	English
Pages (from-to)	46-49
Number of pages	4
Journal	Electrochemistry Communications
Volume	27
DOIs	https://doi.org/10.1016/j.elecom.2012.10.032
Publication status	Published - 2013 Feb

Keywords

High temperature-PEMFC
Oxygen reduction reaction
Phosphoric acid
Se-modified-Ru catalyst

ASJC Scopus subject areas

Electrochemistry

Access to Document

10.1016/j.elecom.2012.10.032

Cite this

@article{ba43617e5220485c9e2a83ad7bc3b58d,

title = "Effect of Se modification on RuSey/C electrocatalyst for oxygen reduction with phosphoric acid",

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.",

keywords = "High temperature-PEMFC, Oxygen reduction reaction, Phosphoric acid, Se-modified-Ru catalyst",

author = "Park, {Hee Young} and Yoo, {Sung Jong} and Kim, {Soo Jin} and Lee, {Sang Young} and Ham, {Hyung Chul} and Sung, {Yung Eun} and Kim, {Soo Kil} and Hwang, {Seung Jun} and Kim, {Hyoung Juhn} and Eunae Cho and Dirk Henkensmeier and Nam, {Suk Woo} and Lim, {Tae Hoon} and Jang, {Jong Hyun}",

note = "Funding Information: This work was supported by the Joint Research Project funded by the Korea Research Council of Fundamental Science & Technology (KRCF), Republic of Korea (Seed-10-2) .",

year = "2013",

month = feb,

doi = "10.1016/j.elecom.2012.10.032",

language = "English",

volume = "27",

pages = "46--49",

journal = "Electrochemistry Communications",

issn = "1388-2481",

publisher = "Elsevier Inc.",

}

TY - JOUR

T1 - Effect of Se modification on RuSey/C electrocatalyst for oxygen reduction with phosphoric acid

AU - Park, Hee Young

AU - Yoo, Sung Jong

AU - Kim, Soo Jin

AU - Lee, Sang Young

AU - Ham, Hyung Chul

AU - Sung, Yung Eun

AU - Kim, Soo Kil

AU - Hwang, Seung Jun

AU - Kim, Hyoung Juhn

AU - Cho, Eunae

AU - Henkensmeier, Dirk

AU - Nam, Suk Woo

AU - Lim, Tae Hoon

AU - Jang, Jong Hyun

N1 - Funding Information: This work was supported by the Joint Research Project funded by the Korea Research Council of Fundamental Science & Technology (KRCF), Republic of Korea (Seed-10-2) .

PY - 2013/2

Y1 - 2013/2

N2 - 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.

AB - 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.

KW - High temperature-PEMFC

KW - Oxygen reduction reaction

KW - Phosphoric acid

KW - Se-modified-Ru catalyst

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U2 - 10.1016/j.elecom.2012.10.032

DO - 10.1016/j.elecom.2012.10.032

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JO - Electrochemistry Communications

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