Volume 94 Issue 32 | p. 9 | Concentrates
Issue Date: August 8, 2016

Hybrid power source delivers high-energy bursts

Glucose-fueled device combines a fuel cell and supercapacitor for powering medical implants
Department: Science & Technology
News Channels: Biological SCENE, Materials SCENE
Keywords: energy storage, glucose, fuel cell, biofuel cell, implants, supercapacitor
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A coin-sized hybrid device that integrates a supercapacitor into a glucose fuel cell (left) could power medical implants.
Credit: Shelley Minteer/U. Utah
Photo of hybrid biofuel cell and supercapacitor next to a quarter for scale.
 
A coin-sized hybrid device that integrates a supercapacitor into a glucose fuel cell (left) could power medical implants.
Credit: Shelley Minteer/U. Utah

Fuel cells that run on glucose could be ideal alternatives to batteries for powering implanted medical devices, such as pacemakers and brain stimulators. But fuel cells alone cannot generate the quick, high-energy pulses such devices need. Researchers have now made a compact power source that delivers such bursts by combining a glucose fuel cell with a supercapacitor (ACS Energy Lett. 2016, DOI: 10.1021/acsenergylett.6b00225). Shelley D. Minteer of the University of Utah and colleagues coated carbon electrodes with enzymes that catalyze redox reactions to produce an electric current. 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.

 
Chemical & Engineering News
ISSN 0009-2347
Copyright © American Chemical Society

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