The performance of microscale fuel cells with high-aspect-ratio electrodes, defined as the ratio of electrode length to width, is often limited by the depletion of fuel along the length of the anode. Here we present a mathematical model to study electrode aspect ratio in a direct methanol microscale fuel cell. The model is supported with experimental data to show that low-aspect-ratio electrodes achieve higher power densities via improved mass transport to electrodes. The influence of electrode width on overall cell performance was investigated by varying the catalyst deposition region in low-aspect-ratio electrodes. The performance of our experimental fuel cell is consistent with our modeling studies, achieving a maximum power density of 25.3 mW/cm2 at room temperature with 1 M methanol. The model presented here can be used to further improve the geometric design of electrodes in a microscale fuel cell.
- Advanced Energy Systems Division
Model-Based Analysis of Electrode Design in a Direct Methanol Microscale Fuel Cell
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Hollinger, AS, Willis, MG, & Doleiden, DG. "Model-Based Analysis of Electrode Design in a Direct Methanol Microscale Fuel Cell." Proceedings of the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2015 Power Conference, the ASME 2015 9th International Conference on Energy Sustainability, and the ASME 2015 Nuclear Forum. ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology. San Diego, California, USA. June 28–July 2, 2015. V001T06A004. ASME. https://doi.org/10.1115/FUELCELL2015-49496
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