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Soon to replace the miniature batteries used in portable custom electronics, hydrogen fuel cells could come. The source reports that the smallest in the world has been created by chemical engineers in the United States hydrogen fuel cell.
The dimensions of the prototype are only 3 x 3 x 1 mm. With comparable to the usual battery-sized, a fuel cell can hold much more energy and means that the electronics powered by such a source will work longer.
Nevertheless, batteries are still easier in production. After all, inside the fuel cell contains the fuel pump and control electronics. Besides in order to achieve their small size, it is still necessary to achieve their low intrinsic energy consumption, which makes building tiny fuel cells challenging task. The head of the project, Saeed Mogaddam, spoke about these features Moghaddam) at the University of Illinois.
A feature of the development of Mogaddam and colleagues was the design of the fuel cell, which implies zero energy consumption by its own cells. It consists of 4 components: membrane, water tank, chamber and metal hydride.
Through thin holes in the membrane, water molecules (steam) enter the chamber, where form hydrogen. This allows you to fill the chamber and press on the diaphragm to she cut off further water access. When reacting with electrodes, hydrogen dries up, forming energy flow. This re-activates the membrane, opening up access to the vapors water, and the process resumes.
The same design features of the device allow the fuel cell to be inverted and turned whatever you want, which is important for mobile consumer electronics.
The prototype generates a voltage of 0.7 V and a current of 0.1 mA. So he can work for 30 hours until it runs out of fuel. For now this is not enough to power a mobile phone, but this is only a prototype and is underway work on improving the characteristics, but this is already enough to supply more small electronics.