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Title: Enhanced Pt utilization in electrocatalysts by covering of colloidal silica nanoparticles
Authors: Zeng, J.
Chen, J.
Lee, J.Y. 
Keywords: Electrocatalysts
Methanol electro-oxidation
Pt utilization
Issue Date: 1-Oct-2008
Citation: Zeng, 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.
Abstract: This 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.
Source Title: Journal of Power Sources
ISSN: 03787753
DOI: 10.1016/j.jpowsour.2008.04.002
Appears in Collections:Staff Publications

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