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dracodraconisSun-powered device converts CO2 into fuel - tech - 18 February 2009 - New Scientist
Researchers at Pennsylvania State University have developed a device composed of titanium dioxide nanotubes coated with copper and platinum that is able to convert carbon dioxide and water into methane using only solar energy. The conversion rate is still far too low to make the process commercializable, but is a 20 faster higher than previous approaches. They expect that they can increase the conversion rate by up to 2 orders of magnitude by tweaking the process.