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December Newsletter: Page 7

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Professor Roy’s Research Group 

Continued from page 3

Due to its low cost and abundance, glycerol is a fuel of particular interest for DAAFCs. Electro-oxidation of glycerol at the anode surface is the driving factor for energy conversion in a direct alkaline glycerol fuel cell (DAGFC). Figure 3 shows illustrative results of EIS measurements performed in Roy’s laboratory to characterize the catalytic function of a gold anode, configured as a rotating disc electrode (RDE) in an alkaline fuel solution of glycerol. The interfacial reactions and their products are identified by measuring the numbers of electrons released during the intermediate steps. The EIS data lead to a circuit model that helps to identify the kinetics of the reactions generating the intermediate products of glycerol oxidation. The RDE setup employed here helps to quantify the role of convective mass transport in supporting the fuel cell’s operation. Detailed results of this investigation have recently appeared in Physical Chemistry Chemical Physics [17 (2015) 11432]. Professor Dipankar Roy is the Chair of Clarkson University’s Physics Department.  Further information about Professor Roy’s current research can be found at:

Fuel cells

Figure 3Nyquist impedance plots recorded using EIS for a gold disc anode rotated at 10 rpm in an alkaline fuel of 2M NaOH + x M Glycerol (Gly); x = (A) 0 and (B) 0.1.Z' and Z" are the real and imaginary parts of the electrode impedance, respectively. The symbols and the lines represent, respectively, experimental data and complex nonlinear least square fits used to develop a circuit model (not shown here) of the catalytic interface. The operating potentials of the half-cell are set at: (a) -0.4, (b) -0.2, (c) 0.0, (d) 0.2 and (e) 0.4V. The potential dependence of the data in (A) reflects the formation and further oxidation of incipient hydrous Au-oxide. The inset in (B) is a close-up view of the high-frequency data. In going from -0.4 to 0.0 V in (B), the overall impedance of the electrode progressively decreases (the Nyquist arcs shrink) as the rate of Gly oxidation increases. Above 0.0 V, adsorbed intermediates act to reverse this trend.  

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Senior University Professor Richard Partch an Invited International Symposium Speaker

Dr. Partch

Senior University Professor Richard Partch 

Senior University Professor Richard Partch was one of eight international speakers invited to the Symposium on Advanced Materials Science and Nanotechnology on December 7-9, 2015 at the University of Costa Rica in the capitol city San Jose. The symposium was sponsored by the MRS. His presentation was titled "Colloids for Medical Therapy: Nanoparticle Approaches for Chemical Overdose Treatment."