The anode is loaded with glucose dehydrogenase and coated with polyethylenimine, which stores charge and acts as the supercapacitor. As glucose becomes oxidized, electrons travel through an external circuit to the cathode, which is coated with bilirubin oxidase. Some of the electrons charge the capacitive polymer layer. During spikes in power demand, the supercapacitor discharges, providing the needed high-energy bursts. The researchers encased the device in a metal mesh so that blood can reach the electrodes and provide a constant supply of glucose. The new device has a capacitance of 300 faradays per gram, more than four times as high as previous biobased supercapacitors delivering comparable voltage. /articles/94/i32/Hybrid-power-source-delivers-high.html 20160808 Glucose-fueled device combines a fuel cell and supercapacitor for powering medical implants Concentrates 94 32 /magazine/94/09432.html /departments/.html /collections/con.html Hybrid power source delivers high-energy bursts Science & Technology Prachi Patel, special to C&EN A coin-sized hybrid device that integrates a supercapacitor into a glucose fuel cell (left) could power medical implants.
by Prachi Patel, special to C&EN |
August 08, 2016