HowStuffWorks «How Fuel Cells Work» | Electric Cars and Hybrid Vehicle - Green energy

HowStuffWorks «How Fuel Cells Work»

24 мая 2014 | Author: | Комментарии к записи HowStuffWorks «How Fuel Cells Work» отключены
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Polymer Exchange Membrane Cells

The polymer exchange fuel cell (PEMFC) is one of the promising fuel cell This type of fuel will probably end up powering buses and maybe even house. The PEMFC uses one of the reactions of any fuel cell. let’s take a look at in a PEM fuel cell:

In Figure 1 you can see are four basic elements of a

The anode . the negative post of the cell, has several jobs. It the electrons that are freed the hydrogen molecules so that can be used in an external circuit. It has etched into it that the hydrogen gas equally over the of the catalyst.

The cathode . the positive post of the cell, has channels etched it that distribute the oxygen to the of the catalyst. It also conducts the back from the external to the catalyst, where they can with the hydrogen ions and to form water.

The electrolyte is the exchange membrane . This treated material, which something like ordinary plastic wrap, only positively charged ions. The blocks electrons. For a PEMFC, the must be hydrated in order to and remain stable.

The catalyst is a special material facilitates the reaction of oxygen and It is usually made of platinum very thinly coated carbon paper or cloth. The is rough and porous so that the surface area of the platinum can be to the hydrogen or oxygen.

The platinum-coated of the catalyst faces the PEM.

Figure 2. Animation of a working cell

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­Figure 2 shows the hydrogen gas (H 2 ) entering the fuel on the anode side. This gas i­s through the catalyst by the pressure. an H 2 molecule comes in contact the platinum on the catalyst, it splits two H + ions and two electrons (e — ). The are conducted through the anode, they make their way the external circuit (doing work such as turning a and return to the cathode side of the cell.

Meanwhile, on the cathode of the fuel cell, oxygen gas (O 2 ) is forced through the catalyst, it forms two oxygen atoms. of these atoms has a strong charge. This negative attracts the two H + ions through the where they combine an oxygen atom and two of the electrons the external circuit to form a molecule (H 2 O).

This reaction in a single cell produces only 0.7 volts. To get this voltage up to a level, many separate cells must be combined to a fuel-cell stack . Bipolar are used to connect one fuel to another and are subjected to both and reducing conditions and potentials. A big with bipolar plates is Metallic bipolar plates can and the byproducts of corrosion (iron and ions) can decrease the effectiveness of cell membranes and electrodes.

Low-temperature fuel cells use metals . graphite and carbon/thermoset (thermoset is a kind of plastic remains rigid even subjected to high temperatures) as plate material.

In the next section, we’ll see how fuel-cell vehicles can be.

Chemistry of a Cell

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