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The first hydrogen-powered cars are already in action on German roads. In the case of e-scooters, however, installation of a high-pressure tank to store the hydrogen is impractical. An alternative here is POWERPASTE. This provides a safe way of storing hydrogen in a chemical form that is easy to transport and replenish without the need for an expensive network of filling stations. This new paste is based on magnesium hydride and was developed by a research team at the Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM in Dresden. POWERPASTE (c) Fraunhofer IFAM POWERPASTE TRL 5 demonstrator of a power generator with a POWERPASTE cartridge and a 100 watt PEM fuel cell. (c) Fraunhofer IFAM TRL 5 demonstrator of a power generator with a POWERPASTE cartridge and a 100 watt PEM fuel cell. Gasoline and diesel engines, which are powered by fossil fuels, will soon be sidelined by climate change. Instead, new propulsion systems will be required. One fuel with a big potential is hydrogen. Hydrogen vehicles are equipped with a reinforced tank that is fueled at a pressure of 700 bar. This tank feeds a fuel cell, which converts the hydrogen into electricity. This in turn drives an electric motor to propels the vehicle. In the case of passenger cars, this technology is well advanced, with several hundred hydrogen-powered automobiles already in operation on German roads. At the same time, the network of hydrogen stations in Germany is projected to grow from 100 to 400 over the next three years. Yet hydrogen is not currently an option for small vehicles such as electric scooters and motorcycles, since the pressure surge during refilling would be too great. Does this effectively shut out such vehicles from hydrogen technology? POWERPASTE: the hydrogen technology for small vehicles Not at all! Researchers from the Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM in Dresden have now come up with a hydrogen-based fuel that is ideal for small vehicles: POWERPASTE, which is based on solid magnesium hydride. "POWERPASTE stores hydrogen in a chemical form at room temperature and atmospheric pressure to be then released on demand," explains Dr. Marcus Vogt, research associate at Fraunhofer IFAM. And given that POWERPASTE only begins to decompose at temperatures of around 250 degC, it remains safe even when an e-scooter stands in the baking sun for hours. Moreover, refueling is extremely simple. Instead of heading to the filling station, riders merely have to replace an empty cartridge with a new one and then refill a tank with mains water. This can be done either at home or underway. The starting material of POWERPASTE is magnesium, one of the most abundant elements and, therefore, an easily available raw material. Magnesium powder is combined with hydrogen to form magnesium hydride in a process conducted at 350 degC and five to six times atmospheric pressure. An ester and a metal salt are then added in order to form the finished product. Onboard the vehicle, the POWERPASTE is released from a cartridge by means of a plunger. When water is added from an onboard tank, the ensuing reaction generates hydrogen gas in a quantity dynamically adjusted to the actual requirements of the fuel cell. In fact, only half of the hydrogen originates from the POWERPASTE; the rest comes from the added water. "POWERPASTE thus has a huge energy storage density," says Vogt. "It is substantially higher than that of a 700 bar high-pressure tank. And compared to batteries, it has ten times the energy storage density." This means that POWERPASTE offers a range comparable to - or even greater than - gasoline. And it also provides a higher range than compressed hydrogen at a pressure of 700 bar. Suitable for e-scooters - and other applications as well With its huge energy storage density, POWERPASTE is also an interesting option for cars, delivery vehicles and range extenders in battery-powered electric vehicles. Similarly, it could also significantly extend the flight time of large drones, which would thereby be able to fly for several hours rather than a mere 20 minutes. This would be especially useful for survey work, such as the inspection of forestry or power lines. In another kind of application, campers might also use POWERPASTE in a fuel cell to generate electricity to power a coffeemaker or toaster. POWERPASTE helps overcome lack of infrastructure In addition to providing a high operating range, POWERPASTE has another point in its favor. Unlike gaseous hydrogen, it does not require a costly infrastructure. This makes it ideal for areas lacking such an infrastructure. In places where there are no hydrogen stations, regular filling stations could therefore sell POWERPASTE in cartridges or canisters instead. The paste is fluid and pumpable. It can therefore be supplied by a standard filling line, using relatively inexpensive equipment. Initially, filling stations could supply smaller quantities of POWERPASTE - from a metal drum, for example - and then expand in line with demand. This would require capital expenditure of several tens of thousands of euros. By way of comparison, a filling station to pump hydrogen at high pressure currently costs between one and two million euros for each fuel pump. POWERPASTE is also cheap to transport, since no costly high-pressure tanks are involved nor the use of extremely cold liquid hydrogen. Pilot center planned for 2021 Fraunhofer IFAM is currently building a production plant for POWERPASTE at the Fraunhofer Project Center for Energy Storage and Systems ZESS. Scheduled to go into operation in 2021, this new facility will be able to produce up to four tons of POWERPASTE a year - not only for e-scooters. * Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM (ifam.fraunhofer.de) * Research News February 2021 - Hydrogen-powered drives for e-scooters [ PDF 0.31 MB ] Contact Cornelia Muller Contact Press / Media Cornelia Muller Press communication Fraunhofer Institute for Manufacturing Technologies and Advanced Materials IFAM, Branch Lab Dresden Winterbergstr. 28 01277 Dresden Phone +49 351 2537-555 Fax +49 351 2554-495 * Send email Navigation and Social Media Share Print Quick Links * Companies * Scientists * Alumni * Sitemap * Publishing Notes * Data Protection Policy * Contact (c) 2021 Source: Fraunhofer-Gesellschaft Fraunhofer-Gesellschaft - Hydrogen-powered drives for e-scooters Online in Internet; URL: https://www.fraunhofer.de/en/press/ research-news/2021/february-2021/ hydrogen-powered-drives-for-e-scooters.html Date: 4.2.2021 17:07