The fuel cell takes flight. In a car, its autonomy is twice as great as that of batteries. It adapts to a satellite phone as well as a train. Despite a high cost, many public actors opt for this inexhaustible pile.

It was invented in 1839. Before the gasoline engine. But it is only in recent years that the fuel cell (Pac) is taking off. She has (almost) everything to please. She has outstanding performance. Emit nothing but a little water and heat. Fits both a satellite phone and a train. Do not make noise. Do not vibrate. In a car, the battery life is twice as long as the batteries, while the full hydrogen takes only a few minutes.

Technical in focus

What's a Pac? A battery that never runs out, because its chemical reaction is maintained by hydrogen injection. The technique is in focus. It works equally well on German U-214 submarines, Hyundai Nexo and Toyota Mirai cars, as well as on a river shuttle in Nantes and a small German experimental aircraft.

High cost

Only disadvantages: the cost, which will decrease if production volumes increase; and the carbon footprint of hydrogen production, which does not exist in pure form in nature.

But one solves a second problem if it is produced with the energy of wind turbines or solar panels: hydrogen becomes a means of storing their intermittent energy.

On the transport side, public actors are launching: buses in service in the Yvelines, soon in the Pas-de-Calais, Pau and Le Mans. Regional trains in the South West. Auvergne, where Michelin gives the "la", will create a network of twenty stations. Morbihan wants to enter the dance. A network of Parisian taxis has set up. This may give the impetus to develop a network of hydrogen stations. Without them, cars and trucks equipped with Pac will not take off.

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Automobile. The fuel cell is back in


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