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Operational Theory
Refer to Figure 2-3: Cross Section of a Micro-Fuel Cell, which
illustrates the following internal description.
Figure 2-3: Cross Section of a Micro-Fuel Cell (not to scale)
At the top end of the cell is a diffusion membrane of Teflon®,
whose thickness is very accurately controlled. Beneath the diffusion
membrane lies the oxygen sensing element—the cathode—with a
surface area almost 4 cm
sufficient wetting of the upper surface with electrolyte, and it is plated
with an inert metal.
The anode structure is below the cathode. It is made of lead and has
a proprietary design which is meant to maximize the amount of metal
available for chemical reaction.
At the rear of the cell, just below the anode structure, is a flexible
membrane designed to accommodate the internal volume changes that
occur throughout the life of the cell. This flexibility assures that the
sensing membrane remains in its proper position, keeping the electrical
output constant.
Teledyne Analytical Instruments
Figure 2-2: Micro-Fuel Cell
2
. The cathode has many perforations to ensure
3000RS-P
10
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