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Rohm: Recharge smartphones with hydrogen cells

Posted: 24 Sep 2012 ?? ?Print Version ?Bookmark and Share

Keywords:hydrogen fuel cell? mobile device charging? calcium hydride?

Japanese electronic parts supplier Rohm, in collaboration with Aquafairy Corp. and Kyoto University, unveiled its latest discovery-a compact, high-output, eco-friendly, portable hydrogen-powered fuel cell for recharging smartphones.

This series of hydrogen fuel cells uses a solid that creates hydrogen by adding water using the water droplet method. The result is power with no harmful by-products such as carbon dioxide or volatile organic compounds. As a result the fuel cells can be disposed of as general waste.

Rohm, along with its research partners, has succeeded in solidifying calcium hydride in a sheet configuration. This allows the generation of about 4.5l of hydrogen from a sheet that measures 38-mm by 38-mm by 2-mm thick, which is less than 3 cubic centimeters in volume. This source of hydrogen weighs about 3g and provides an energy output of 5-watthours and allows the cell to fully charge a smartphone in less than two hours, according to Rohm.

Calcium hydride sheet

The hydrogen fuel cells are compact and can operate at ambient temperatures, making them suitable for use in smartphone chargers, tablet PCs, as power sources outdoors and in remote areas, and in emergency backup power supplies. Rohm has two formats for smartphone chargers, an enclosure version measuring 140-mm by 65-mm by 20-mm and a card case format measuring 86-mm by 52-mm by 19-mm. Operating temperature range for both is -5 degrees to +40 degrees C.

They also have an advantage over lithium-ion batteries and direct methanol fuel cells can only store energy for a limited time. The hydrogen fuel cells use laminated aluminium to enable storage without losing energy of more than 20 years, Rohm claimed.

In addition to producing hydrogen fuel cells for smartphone chargers, Rohm and Aquafairy, in collaboration with Kinkei System Corp., are also developing fuel cells for powering seismometers in remote areas that prevent the use of traditional power supplies. Compared with conventional lead batteries with the same energy capacity, the hydrogen fuel cells reduce weight by 25 per cent, making it possible to provide 400-Whr from a device that weighs 3kg, Rohm said.

Construction of hydrogen fuel cell. Source: Rohm

- Peter Clarke
??EE Times

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