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Solar fuel cell

Rating (?)
Difficulty (?)
Duration (?)2h 0 min.
Cost (?)~10 CHF
Languagefrançais english
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This project illustrates the principle of an 'ecological' fuel cell. Using a photovoltaic solar cell, electrolysis is carried out to separate hydrogen from the oxygen contained in the water. Then it is possible to produce electricity the other way round and lit up a small LED bulb.

The development and commercialization of hydrogen-powered fuel cell cars is regularly announced. These vehicles are often presented as an alternative to combustion engines (gasoline, diesel).


Hydrogen is not found as it is in nature. It is usually produced through electrolysis (the opposite principle of the fuel cell) and requires a lot of electricity. If the electricity used comes from non-renewable and polluting energies, this only shifts the problem and is therefore not an effective response to current environmental challenges. Otherwise, this solution is interesting, especially as a way to store electricity.

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Using an awl, drill in the center of the cap two holes corresponding to the spacing of the two c ...
Cut 2 pieces of 3cm from the large electric wire.   Strip them and check if the copper rods pa ...
Fix the two pieces of copper at the level of the first screws of the connector. Be careful not t ...
Pass the two copper rods through the inner holes of the cap.
On the other side of the cap, slide another connector. With your fingers squeeze the cap inbetwe ...
Strip both ends of the electrical wires (one end on 0.5cm, the other on 2cm).   On the less ba ...
On the other side of the wires, connect  crocodile cla by twisting the bare part of the wires th ...
Pass a blue crimp over the unpointed end of a pencil lead. Unscrew the screws of the lower conne ...
Cut a small rectangle of about 3x1cm in cardboard. At both ends write on one side H (for hydroge ...

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