Dual-frequency ultrasound for designing two dimensional catalyst surface: Reduced graphene oxide-Pt composite
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- 作者：K. Vinodgopal ; B. Neppolian ; Najah Salleh ; Ian V. Lightcap ; Franz Grieser ; Muthup ; ian Ashokkumar ; Tomas T. Ding ; Prashant V. Kamat
- 关键词：Reduced graphene oxide ; Graphene ; Dual frequency ultrasound
- 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
- 出版年：2012
- 出版时间：5 September, 2012
- 年：2012
- 卷：409
- 期：Complete
- 页码：81-87
- 全文大小：1429 K
文摘
Few-layered reduced graphene oxide-Pt composites are prepared using a combination of two ultrasound frequencies at 20 kHz and 211 kHz. Such a unique dual frequency arrangement operating in tandem, yields large exfoliated graphene sheets with platinum nanoparticles dispersed on them. The extent of reduction achieved by the use of this dual frequency sonication arrangement is evaluated by XPS, IR, and Raman spectroscopies. Transmission electron and atomic force microscopies confirm the morphology of resulting assemblies to be bi- and single layered sheets. These composites show good electrocatalytic activity towards methanol oxidation.