Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.apcata.2006.04.019
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dc.titleActivities of Pt/C catalysts prepared by low temperature chemical reduction methods
dc.contributor.authorZeng, J.
dc.contributor.authorLee, J.Y.
dc.contributor.authorZhou, W.
dc.date.accessioned2014-10-09T06:43:01Z
dc.date.available2014-10-09T06:43:01Z
dc.date.issued2006-07-10
dc.identifier.citationZeng, J., Lee, J.Y., Zhou, W. (2006-07-10). Activities of Pt/C catalysts prepared by low temperature chemical reduction methods. Applied Catalysis A: General 308 : 99-104. ScholarBank@NUS Repository. https://doi.org/10.1016/j.apcata.2006.04.019
dc.identifier.issn0926860X
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/88500
dc.description.abstractCarbon supported Pt nanoparticles were prepared in aqueous solutions by two methods: (1) room temperature NaBH4 reduction of H2PtCl6 with (Pt-1) or without (Pt-2) sodium citrate as the stabilizing agent and (2) microwave-assisted reduction of H2PtCl6 at boiling temperature using citrate as the reducing agent cum stabilizer (Pt-3 and Pt-4). The catalysts were characterized by X-ray diffraction, energy dispersive X-ray microanalysis and transmission electron microscopy, and their activities in room temperature methanol electrooxidation were evaluated by cyclic voltammetry and benchmarked against a commercial E-TEK catalyst with the same Pt loading. TEM showed smaller Pt particles if citrate was present in the synthesis, with average particle sizes of 4.0 and 2.2 nm for Pt-1 and Pt-3, respectively. While the presence of citrate was generally beneficial to forming smaller and more uniform Pt nanoparticles, a large excess of citrate (H2Cyt-:PtCl6 2- = 20:1) in the microwave synthesis had led to a decrease in catalytic activity. The microwave-synthesized Pt/C obtained using a smaller excess of citrate (H2Cyt-:PtCl6 2- = 5:1) demonstrated the best mass activity, surpassing the performance of the commercial catalyst. In addition, a size effect was found in this study: with the decrease in the platinum particle size in the range of 2.2-4 nm, the specific activity of Pt for room temperature methanol oxidation also decreased. © 2006 Elsevier B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.apcata.2006.04.019
dc.sourceScopus
dc.subjectCitrate
dc.subjectMethanol oxidation
dc.subjectMicrowave
dc.subjectPt nanoparticles
dc.subjectSize effect
dc.typeArticle
dc.contributor.departmentCHEMICAL & BIOMOLECULAR ENGINEERING
dc.description.doi10.1016/j.apcata.2006.04.019
dc.description.sourcetitleApplied Catalysis A: General
dc.description.volume308
dc.description.page99-104
dc.description.codenACAGE
dc.identifier.isiut000238728500012
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