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This paper presents a gray-box equivalent circuit model (ECM) in order to predict the performance of direct methanol fuel cell (DMFC) unit. The ECM is composed of electronic components ranging from operational amplifier resistors to diodes. The current–voltage profiles and current–power profiles of this ECM are validated by the simulation results of the COMSOL model. Afterward, the influences of methanol...
A four-cell air-breathing micro direct methanol fuel cell (μDMFC) stack with two double-side patterned PDMS distributors was designed, fabricated, and tested in this paper. A novel n-inlet and n-outlet (NINO) smooth parallel flow field was first introduced. Based on the NINO smooth parallel flow field, the other three kinds of parallel flow field: square protrusion parallel flow field, semicircle...
To improve the low mass transfer efficiency and poor performance of micro direct methanol fuel cells (μDMFCs), a detailed study on the micro direct methanol fuel cell flow field structure is developed in this paper. Since the flow field structure plays an important role in increasing the performance of cells. Silicon-based self-breathing μDMFCs with the gird, parallel, single serpentine, double serpentine...
In this paper, a brief description about the development of micro polymer electrolyte fuel cell (PEFC) was presented. PEFCs were divided into two different types: micro proton exchange membrane fuel cell, which used hydrogen as fuel, and micro direct methanol fuel cell, which used liquid methanol as fuel. To compete with the advanced batteries technology, the miniaturization of the fuel supply system...
Design and fabrication of a silicon-based micro direct methanol fuel cell (μDMFC) are presented in this paper, and a novel encapsulating method adopting PDMS is also designed, which could easily achieve close contact of the critical cell components. Meanwhile, serpentine flow field is found to have the optimal performance by different flow field structures of μDMFC tests, and the optimized size of...
In this paper, an active oxygen-supplying micro direct methanol fuel cell (μDMFC) and an air-breathing μDMFC were designed, fabricated and tested. Stainless steel plates with the thickness of 200μm were chosen to fabricate the current collectors by the micro stamping. The 5-layered membrane electrode assembly (MEA) was fabricated by the catalyst coated membrane (CCM) method. The polymethyl methacrylate...
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