What kind of different energy sources can future mobile devices use? E.g. solar energy.

Nanotechnology holds out the possibility that the surface of a device will become a natural source of energy via a covering of “Nanograss” structures that harvest solar power. At the same time new high energy density storage materials allow batteries to become smaller and thinner, while also quicker to recharge and able to endure more charging cycles.

Source: http://www.nokia.com/link?cid=EDITORIAL_882484

Samsung Electro-Mechanics has developed a micro-fuel cell and hydrogen generator that runs on water. When the handset is turned on, metal and water in the phone react to produce hydrogen gas. The gas is then supplied to the fuel cell where it reacts with oxygen in the air to generate power.

Source: http://www.sem.samsung.com/cms/_work/en/company/news/newsView.jsp?seq=641

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