Journal article
Dual-frequency ultrasound for designing two dimensional catalyst surface: Reduced graphene oxide-Pt composite
K Vinodgopal, B Neppolian, N Salleh, IV Lightcap, F Grieser, M Ashokkumar, TT Ding, PV Kamat
Colloids and Surfaces A Physicochemical and Engineering Aspects | ELSEVIER SCIENCE BV | Published : 2012
Abstract
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. © 2012 Elsevier B.V..
Grants
Awarded by Australian Research Council
Funding Acknowledgements
KV acknowledges the support of NSF CREST HRD-0833184. NS acknowledges the support of NSF HRD-0807055. FG and AM gratefully acknowledges support from the Particulate Fluids Processing Centre at the University of Melbourne, and the Australian Research Council. P.V.K. acknowledges the support of the Office of Basic Energy Sciences of the U.S. Department of Energy. This is Contribution No. NDRL-4925 from the Notre Dame Radiation Laboratory.