View in EDS

Synthesis of an active and stable Ptshell–Pdcore/C catalyst for the electro-oxidation of methanol.

Saved in:
Bibliographic Details
Title: Synthesis of an active and stable Ptshell–Pdcore/C catalyst for the electro-oxidation of methanol.
Authors: Choi, Insoo1,2, Ahn, Sang Hyun2, Kim, Myeong Ho1, Kwon, Oh Joong3 ojkwon@incheon.ac.kr, Kim, Jae Jeong1 jjkimm@snu.ac.kr
Source: International Journal of Hydrogen Energy. Mar2014, Vol. 39 Issue 8, p3681-3689. 9p.
Subjects: Platinum compounds, Palladium catalysts, Chemical stability, Oxidation of methanol, Electrolytic oxidation, Inorganic synthesis, Electroless deposition
Abstract: Abstract: A Ptshell–Pdcore/C catalyst is prepared via electroless deposition and galvanic displacement. The catalyst is active toward the electro-oxidation of methanol and is more stable against COad-poisoning than a commercial Pt/C catalyst. The stable activity of Ptshell–Pdcore/C is ascribed to the tuned electronic property of the Pt over-layer in the Ptshell–Pdcore/C, which leads to weak binding with COad and increases the kinetics of OHad formation. The weakened binding property of the surface Pt with COad and the facile oxidation of COad by OHad were confirmed by a spectroscopic analysis and in a COad-stripping experiment, respectively. The electro-oxidation of COad by OHad is the rate-determining step of methanol oxidation. Therefore, the accelerated formation of OHad contributes to the overall oxidation reaction, preventing COad-poisoning. In addition, Ptshell–Pdcore/C maintains its activity longer than Pt/C does during a prolonged cycle experiment. [Copyright &y& Elsevier]
Copyright of International Journal of Hydrogen Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:Abstract: A Ptshell–Pdcore/C catalyst is prepared via electroless deposition and galvanic displacement. The catalyst is active toward the electro-oxidation of methanol and is more stable against COad-poisoning than a commercial Pt/C catalyst. The stable activity of Ptshell–Pdcore/C is ascribed to the tuned electronic property of the Pt over-layer in the Ptshell–Pdcore/C, which leads to weak binding with COad and increases the kinetics of OHad formation. The weakened binding property of the surface Pt with COad and the facile oxidation of COad by OHad were confirmed by a spectroscopic analysis and in a COad-stripping experiment, respectively. The electro-oxidation of COad by OHad is the rate-determining step of methanol oxidation. Therefore, the accelerated formation of OHad contributes to the overall oxidation reaction, preventing COad-poisoning. In addition, Ptshell–Pdcore/C maintains its activity longer than Pt/C does during a prolonged cycle experiment. [Copyright &y& Elsevier]
ISSN:03603199
DOI:10.1016/j.ijhydene.2013.12.118