What's mean is Fuel Cell (1) ? by mary lv

(1)?Hydrogen must be carried in a pressurized bottle. If propane, natural gas

or diesel are used, a reformer is needed to convert the fuel to hydrogen.

Reformers for PEMFCs are bulky and expensive. They start slowly and

purification is required. Often the hydrogen is delivered at low pressure and

additional compression is required. Some fuel efficiency is lost and a

certain amount of pollution is produced. However, these pollutants are typically 90 percent

less than what comes from the tailpipe of a car. The fuel cell concept was developed

in 1839 by Sir William Grove, a Welsh judge and gentleman scientist. The

invention never took off, partly because of the success of the internal

combustion engine. It was not until the second half of the 20th century when

scientists learned how to better utilize materials such as platinum and

Teflon? that the fuel cell could be put to practical use. A fuel cell can be thought of as

electrolysis in reverse, using two electrodes separated by an electrolyte.

Hydrogen is presented to the negative electrode (anode) and oxygen to the

positive electrode (cathode). A catalyst at the anode separates the hydrogen

into positively charged hydrogen ions and negatively charged electrons. On

the PEM system, the hydrogen is catalyzed; the smaller protons migrate across

the membrane to the cathode where they combine with oxygen to produce water

and heat. The electrodes pick up the electrons to produce an electric

current. A single fuel cell produces 0.6 to 0.8V under load. Several cells

are connected in series to obtain higher voltages. more info:www.good-battery.com

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