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Stockholm techies use water to charge mobile phones -
2012-03-06 11:55:18 GMT
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"The hockey puck like container called the Powerpukk has sodium silicide which produces hydrogen gas when combined with water. Then there is a tray with a little opening where you pour in water, about a tablespoon. Sodium silicide is a specially developed chemical from SiGNa Chemistry. When mixed with water to release hydrogen gas, it is a key element of this system."
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