Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13380
Title: Hydrodynamic focusing in microfluidic membraneless fuel cells : breaking the trade-off between fuel utilization and current density
Authors: Xuan, J
Leung, MKH
Leung, DYC
Ni, M 
Wang, H
Keywords: Computational fluid dynamics
Current density
Fuel utilization
Hydrodynamic focusing
Microfluidics
Issue Date: 2011
Publisher: Pergamon Press
Source: International journal of hydrogen energy, 2011, v. 36, no. 17, p. 11075-11084 How to cite?
Journal: International journal of hydrogen energy 
Abstract: Microfluidic membraneless fuel cell (MFC) is a promising fuel cell type due to its simple structure without the need of proton conducting membrane. However, the common disadvantage is the low fuel utilization. Previous works have shown that adopting a conventional method to increase the fuel utilization would cause a low power density. This study shows that the use of hydrodynamic focusing technology can overcome the trade-off problem between the fuel utilization and the current density. A numerical model has been developed to simulate the MFC operation with the fuel stream being hydrodynamically focused by a buffer stream. The results indicate that both fuel utilization and current density can be increased by properly adjusting the buffer flow rate to enhance the flow focusing. The optimal performance is achieved when the buffer-to-fuel flow rate ratio is around 25. Moreover, high fuel flow rate and shallow channel shape have proven beneficial to the cell performance with the use of hydrodynamic focusing technology. It is predicted that a MFC with a current density above 100 mA cm -2 is capable of achieving fuel utilization up to 50%, which is considerably higher than the previously reported value of 5-8%.
URI: http://hdl.handle.net/10397/13380
ISSN: 0360-3199
EISSN: 1879-3487
DOI: 10.1016/j.ijhydene.2011.05.150
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