Optical Measurement Technique of Water Contents in Polymer Membrane for PEFCs

[+] Author and Article Information
Kazuyoshi Fushinobu

Department of Mechanical and Control Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japanfushinok@mech.titech.ac.jp

Kenji Shimizu, Nariaki Miki, Ken Okazaki

Department of Mechanical and Control Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan

J. Fuel Cell Sci. Technol 3(1), 13-17 (Aug 22, 2005) (5 pages) doi:10.1115/1.2133801 History: Received February 02, 2005; Revised August 22, 2005

The feasibility of an optical technique is examined for the measurement of the membrane water content in polymer electrolyte fuel cells (PEFCs). Transmission of the infrared light of 1.92 μm wavelength is used to measure the water content in the polymer electrolyte membrane. A calibration procedure is examined, and the technique is applied for the transient measurement of a Nafion membrane that gives the value of water diffusion coefficient, consistent with previous reports. The technique is then applied to an operating PEFC to show its applicability for in situ measurement.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Visualization of membrane water content

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Figure 2

Experimental setup

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Figure 3

Membrane holder, positioned at the “Sample Holder” in Fig. 2

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Figure 4

FTIR optical transmission data of Nafion 117 under various water content

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Figure 5

Experimentally obtained calibration curve: optical transmissivity, τ, to water content, λ

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Figure 6

Measured adsorption and desorption isotherm

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Figure 7

Temporal profile of dimensionless water content, Λ, measured at different positions, x. (a) x=2mm; (b) x=4mm

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Figure 8

Profile of dimensionless water content, Λ, as a function of reduced distance, y

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Figure 12

Temporal profile of the membrane water content, λ, at 5mm from gas inlet. [Cell temperature: 30°C, anode: H2(300ml∕min), cathode: air (300ml∕min), i=200mA∕cm2.]

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Figure 11

i-V characteristics of the visualization cell shown in Fig. 8 [Cell temperature: 30°C, Anode: H2(300ml∕min)]

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Figure 10

Schematic of measurement cell (unit: mm)

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Figure 9

Diffusion coefficient, D, as a function of water content, λ



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