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Electrochemical preparation of Pt-based catalysts on carbon paper treated with Sn sensitization and Pd activation

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Title: Electrochemical preparation of Pt-based catalysts on carbon paper treated with Sn sensitization and Pd activation
Authors: Ahn, Sang Hyun1, Choi, Insoo1, Kwon, Oh Joong2, Lim, Taeho1, Kim, Jae Jeong1 jjkimm@snu.ac.kr
Source: International Journal of Hydrogen Energy. Jan2012, Vol. 37 Issue 1, p41-50. 10p.
Subjects: Electrochemical analysis, Platinum catalysts, Carbon paper, Tin, Activation (Chemistry), Cobalt plating, Nucleation, Hydrophilic compounds, Oxidation
Abstract: Abstract: CoRuPt and CoPtRu catalysts were prepared on carbon paper (CP) using various electrochemical processes including Sn sensitization, Pd activation, Co electrodeposition and galvanic displacement. The Sn–Pd process is a surface treatment that guarantees a larger number of nucleation sites on CP for subsequent Co electrodeposition by modifying the surface to be more hydrophilic. Co particles were deposited on Sn-Pd-treated CP (SCP) by controlling deposition potential and time. Then, Pt and Ru galvanic displacements were performed on the Co particles to form CoRuPt/SCP and CoPtRu/SCP catalysts. Electrochemical measurements confirmed that the CoRuPt/SCP – 1 catalyst with a 1.02 Pt/Ru surface molar ratio showed a peak potential of 741 mV (vs. NHE) for methanol oxidation and 637 mV for carbon monoxide stripping. These values were 80 and 8 mV lower, respectively, than those of a PtRu/C commercial catalyst. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: CoRuPt and CoPtRu catalysts were prepared on carbon paper (CP) using various electrochemical processes including Sn sensitization, Pd activation, Co electrodeposition and galvanic displacement. The Sn–Pd process is a surface treatment that guarantees a larger number of nucleation sites on CP for subsequent Co electrodeposition by modifying the surface to be more hydrophilic. Co particles were deposited on Sn-Pd-treated CP (SCP) by controlling deposition potential and time. Then, Pt and Ru galvanic displacements were performed on the Co particles to form CoRuPt/SCP and CoPtRu/SCP catalysts. Electrochemical measurements confirmed that the CoRuPt/SCP – 1 catalyst with a 1.02 Pt/Ru surface molar ratio showed a peak potential of 741 mV (vs. NHE) for methanol oxidation and 637 mV for carbon monoxide stripping. These values were 80 and 8 mV lower, respectively, than those of a PtRu/C commercial catalyst. [Copyright &y& Elsevier]
ISSN:03603199
DOI:10.1016/j.ijhydene.2011.09.074