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US researchers say they have demonstrated how cells fuelled by bacteria can be "self-powered" and produce a limitless supply of hydrogen.
"We use those microbes, particularly inside something called a microbial fuel cell (MFC), to generate electrical power. We can also use them in this device, where they need a little extra power to make hydrogen gas."
The next step, Prof Logan explained, was to develop larger-scale cells: "Then it will easier to evaluate the costs and investment needed to use the technology.