Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jpowsour.2008.04.002
DC FieldValue
dc.titleEnhanced Pt utilization in electrocatalysts by covering of colloidal silica nanoparticles
dc.contributor.authorZeng, J.
dc.contributor.authorChen, J.
dc.contributor.authorLee, J.Y.
dc.date.accessioned2014-06-17T07:40:15Z
dc.date.available2014-06-17T07:40:15Z
dc.date.issued2008-10-01
dc.identifier.citationZeng, J., Chen, J., Lee, J.Y. (2008-10-01). Enhanced Pt utilization in electrocatalysts by covering of colloidal silica nanoparticles. Journal of Power Sources 184 (2) : 344-347. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jpowsour.2008.04.002
dc.identifier.issn03787753
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/63845
dc.description.abstractThis work aims at enhancing Pt utilization in electrocatalysts by covering of preformed silica nanoparticles. Pt/C electrocatalysts were prepared by reductive deposition of Pt by citrate at moderate temperatures on silica nanoparticles with varying atomic silica to Pt ratios (1.7:1 and 3.3:1) to study the effects of silica to Pt ratio. Considerable voidages were created by inter-situated 10-20 nm silica nanoparticles between support carbon particulates to facilitate mass transfer of reactants and products. This particular method of catalyst preparation increases the Pt metal utilization, and generates a large amount of accessible voidage in the interpenetrating particle network of carbon and silica to support the facile transport of reactants and products. Electrochemical hydrogen adsorption/desorption has shown an increase in electrochemically active surface area by this approach. Methanol electro-oxidation was used as a test reaction to evaluate the catalytic activity. It was found that the Pt catalyst modified with silica at silica:Pt = 1.7:1 atomic ratio was more active than a catalyst prepared when silica to Pt ratio increased to 3.3:1. © 2008 Elsevier B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.jpowsour.2008.04.002
dc.sourceScopus
dc.subjectElectrocatalysts
dc.subjectMethanol electro-oxidation
dc.subjectPt utilization
dc.subjectSilica
dc.typeArticle
dc.contributor.departmentCHEMICAL & BIOMOLECULAR ENGINEERING
dc.description.doi10.1016/j.jpowsour.2008.04.002
dc.description.sourcetitleJournal of Power Sources
dc.description.volume184
dc.description.issue2
dc.description.page344-347
dc.description.codenJPSOD
dc.identifier.isiut000259889100003
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