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Article

# The Amount of Hydrophobic Resin Binder in the Micro Diffusion Layer for DMFC

[+] Author and Article Information
Minehisa Imazato, Hayato Hommura, Go Sudo, Kenji Katori, Koichi Tanaka

Core Technology Development Group, Micro Systems Network Company, Sony Corporation, Yokohama-shi, Kanagawa, 240-0036, Japan

J. Fuel Cell Sci. Technol 1(1), 66-68 (Jul 05, 2004) (3 pages) doi:10.1115/1.1794710 History: Received April 04, 2004; Revised July 05, 2004

## Abstract

The micro-diffusion layer for DMFC consists of carbon and hydrophobic resin used as a binder. The function of the micro diffusion layer on carbon paper is not only to support the catalyst layer to conduct electricity, but also to maintain a stable mixture of gas and liquid. The amount of hydrophobic resin binder in the micro diffusion layer is therefore a critical parameter. The amount of hydrophobic resin binder is normally less than $50wt%$, but we investigated this parameter and found that there is another high performance area around $80wt%$.

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## Figures

Figure 1

Effect of the amount of hydrophobic resin in the cathode diffusion layer on maximum power density in the case of oxygen (solid line) and air (dotted line) as oxidant

Figure 2

Effect of the amount of hydrophobic resin in the anode diffusion layer on maximum power density in the case of oxygen (solid line) and air (dotted line) as oxidant

Figure 3

Electrical resistance across the diffusion layer

Figure 4

Dependence of cell impedance on the amount of hydrophobic resin in the cathode diffusion layer in the case of oxygen (circle) and air (square) as oxidant

Figure 5

Dependence of cell impedance on the amount of hydrophobic resin in the anode diffusion layer in the case of oxygen (circle) and air (square) as oxidant

Figure 7

Top view of diffusion layer with (a) 60, (b) 80, (c) 90, (d) 95wt% of hydrophobic resin

Figure 6

Gas permeability of the diffusion layer with different amounts of hydrophobic resin

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