Whereas most conventional PEM-based fuel cells are limited to operation in acidic media, these membraneless fuel cells can also operate in alkaline media, which enhances reaction kinetics at both the anode and cathode and thus overall fuel cell performance. Advantages of the membraneless designs include the elimination of: fuel crossover, water management issues, and restrictions on media. The occurrence of laminar flow at the microscale eliminates the need for the usual static barrier of a polymer electrolyte membrane (PEM). We are pursuing the development of membraneless micro fuel cells in which two aqueous streams containing fuel and oxidant, respectively, flow side-by-side in a single microfluidic channel with the anode and cathode placed on opposing sidewalls.
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Designs need to be adjusted to account for, or even utilize, the characteristics of the microscale. The development of microchemical systems often entails more than mere miniaturization of macro or meso-scale systems. My program focuses on exploratory, multidisciplinary research in microchemical systems including stand-alone applications, such as microreactors and microfuel cells, as well as microfluidic tools that enable or facilitate other studies. In modern science and engineering, some of the best opportunities for research come at the borders between existing fields. Microchemical Systems: Microreactors, Microfuel Cells, and Microfluidic Tools
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Postdoctorate, Harvard University, 1997-2000.114 Roger Adams Laboratory For more information