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Fuel Cells

Fuel Cells convert an electrochemical reaction to electticity. There are applications that are sationary, portable and those used in transportation. All Fuel Cells are composed of an anode, cathode and electrolyte and are typically characterized by the composition of he electrolyte. The most common is the Proton Exchange Membrane (PEM). Others are Phospheric Acid (PAFC), Solid Oxide (SOFC), Molten Carbonate (MCFC) and Direct Methane (DMFC).

500 Questions

What is the effect if a bulb is broken in a parallel or series circuit?

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parallel circuit: Providing that the breakage does not result in a short circuit the other bulbs will still light.

series circuit: If the breakage results in a short circuit through the bulb the other bulbs will light more brightly. If the breakage results in a breakage of the connection through the bulb then the other bulbs will not light.

When will Fuel cells be mass produced for cars?

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Only if the marketplace demands it. Like everything else, "Supply and Demand."

What happens in a hydrogen oxygen fuel cell?

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Oxygen diffuses through the cathode

Why are fuel cells used on the space shuttle instead of batteries?

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Two reasons:

  1. Weight. Batteries are heavier per energy unit than fuel cells.
  2. Capacity. Fuel cells can store much more energy than batteries.

As a bonus, the weight for the fuel cell fuel reduces the weight of another required consumable: water. The "exhaust" of fuel cells is pure water which astronauts can drink.

How does fuel cell differ from a battery?

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A fuel cell is different from a battery cell in so far as reactants are constantly supplied to a fuel cell making it an open system whereas a battery cell is a closed system that stores the reactants within it. A fuel cell works as long as fuel is supplied to it whereas a battery cell requires regular replacements.