Japanese researchers report in the latest issue of Energy and Environmental Science that they have created a biofuel cell that uses enzymes to break down sugars. Four of the cells combined produce 100 milliwatts of power— enough to run an MP3 player with speakers or a remote-controlled car.
Each cell consists of an anode and cathode separated by a proton-conducting membrane. Sugar—or another renewable fuel— is oxidized at the nanode, where it generates electrons and protons. The electrons and protons then combine with oxygen at the cathode to form water.
The researchers amped up the cell’s energy output by using an electron transfer mediator to move electrons between the electrodes and enzymes.
The Japanese biofuel cell is the first to have an energy output high enough for practical applications, so hopefully it will unleash a flurry of interest in the field. And who knows—in the future, you may power even larger electronics with biofuel cells.
Future MP3 players may eat sugar to recharge
Electricity from sugar
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