Fuel Cells

The electrochemical cell with solids as electrodes, as in Fig. 10.2a, operates as a battery. That is, it produces current until one of the reactants is exhausted. The cell needs to be charged by operating in the electrolysis mode, as in Fig. 10.2b.

If the active constituents of the two half-cells are gaseous, however, continuous operation is possible. The preceding example dealt with a cell with one gaseous electrode and one solid electrode. In this section, a cell fueled only by gas flows is analyzed. Electrochemical cells fed by external reactant sources are called fuel cells.

The simplest fuel cell is one that combines hydrogen and oxygen to produce only water as a waste product. A schematic of such a cell is shown in Fig. 10.3. The overall cell reaction is:

The unit is operated at room temperature, which permits an aqueous solution to be used as the

Getting Started With Solar

Getting Started With Solar

Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.

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