"Graphene in new ‘battery’ breakthrough? " - fact or fiction?

Fact or fiction?:

Mar 8, 2012, Graphene in new ?battery? breakthrough?:

Quote: "... Researchers at Hong Kong Polytechnic University claim to have invented a new kind of graphene-based "battery" that runs solely on ambient heat. The device is said to capture the thermal energy of ions in a solution and convert it into electricity. ... According to the researchers, the battery works rather like a solar cell. ..."

1 Mar 2012, Self-Charged Graphene Battery Harvests Electricity from Thermal Energy of the Environment: PDF:

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Glenn