Abstract
In order to solve the problem that bolts in traditional packaged direct methanol fuel cells (DMFCs) take up a large area and reduce the specific energy (energy per unit weight) and power density (power per unit area), a new button-type micro direct methanol fuel cell (B-μDMFC) is designed, assembled, and packaged. The cell with four different structures was tested before and after packaging. The results indicate that the button cell with three-dimensional graphene and springs has the best performance. The equivalent circuit and methanol diffusion model was applied to explain the experimental results. The peak volumetric specific power density of the cell is 11.85 mW cm−3. This is much higher than traditional packaged DMFC, because the novel B-μDMFC eliminates bolts in the structure and improves the effective area ratio of the cell.
Highlights
Close attention [1,2,3] has been paid to the micro direct methanol fuel cell, because it is the potential mobile energy for portable devices [4,5,6,7]
A gas-liquid separation membrane was set in the hole in the lid to facilitate experiments was 1 MPa
A new button-type micro direct methanol fuel cell is designed and manufactured and the performance of the cell is compared with the traditional direct methanol fuel cells (DMFCs)
Summary
Close attention [1,2,3] has been paid to the micro direct methanol fuel cell (μDMFC), because it is the potential mobile energy for portable devices [4,5,6,7]. Support the GDL,of a the titanium-plated stainless steelsteel mesh was (FN and stainless stainless wire mesh was added between the gas diffusion layer and the end plate on both sides steel springs) were used as current collectors (CCs) in the of the anode and cathode. The components and structure of the button-type micro direct methanol fuel cell (B-μDMFC) are shown in Figures 1 and 2, respectively. In order to reduce the internal contact resistance of the cell and support the GDL, a titanium-plated stainless steel wire mesh was added between the gas diffusion layer and the end plate on both sides of the anode and cathode. Three-dimensional graphene; S, FN, foam nickel; CP,direct carbonmethanol paper; GDL, diffusion layer;. Graphene; S, springs; FN, foam nickel; CP, carbon paper; GDL, gas diffusion. A gas-liquid separation membrane was set in the hole in the lid to
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