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Each pixel consists of an anode and cathode separated by a thin, organic membrane.
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Many lithium batteries, particularly in the mobile space, use graphite as an anode but this has limited capacity.
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There are several sorts of fuel cell, but all consist of two electrodes (an anode and a cathode) separated by a material called an electrolyte.
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These run from anode to cathode and thus create an electric current.
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In most fuel cells hydrogen is fed to the anode, where it is ionised into a proton and an electron.
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Bacteria oxidize the organic matter and, in the process, produce electrons that run from the anode to the cathode within the fuel cell, creating an electrical current.
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