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CAER Seminars

Advanced Carbon Materials for Energy and Electroanalytical Applications

Speaker:
Doo Young Kim
University of Kentucky Chemistry Department
Lexington, KY

Date:
October 25, 2011 at 10:00am
Ben Bandy Conference Center
UK Center for Applied Energy Research

Abstract:
In the first part of my talk, I will report on my research in developing advanced carbon-support material in proton exchange membrane (PEM) fuel cells. Our approach is to modify sp2 carbon powder (e.g. Glassy Carbon (GC), Ketjen Black (KB)) with an overlayer of boron-doped ultra-nanocrystalline diamond (B-UNCD) using microwave-assisted chemical vapor deposition. Many unique and interesting material properties of conductive diamond, which are not seen in the sp2 carbon counterpart will be presented. How diamond nucleates at the edge plane of sp2 carbon and how the interface is formed between two carbon phases will be addressed. Based on our results from TEM, XRD, in-situ Raman spectroscopy, and electrochemical methods, B-UNCD-coated KB powder showed significantly improved stability of Pt catalyst compared to unmodified KB powder.

In the second part of my talk, very recent data on the electrochemical modification of graphene material will be presented. Due to many interesting and unique properties such as excellent thermal and electrical conductivity, optical transparency, and high surface area (2600 m2/g for single layer graphene), graphene-based materials attracted strong scientific and technological interests and have been extensively studied in many research areas such as energy storage and conversion devices as well as sensing and bioanalytical applications (optics, electricity, and electrochemistry-based). In this presentation, voltammetric and electrochemical impedance data, the effect of electrolyte on double-layer capacitance and the electrochemical modification of graphene electrode surface in order to tailor electron transfer properties will be discussed.