Technology

#96: Microbes Build Better Batteries

Microbes can help wind and solar by storing energy as methane; viruses make clean and cheap batteries.

By Elizabeth SvobodaDec 17, 2009 12:00 AM

Newsletter

Sign up for our email newsletter for the latest science news
 

In the never-ending search for improved ways to store energy, two groups are looking to biology, enlisting microbes to produce methane and viruses to build batteries.

Penn State environmental engineer Bruce Logan and his colleagues identified micro­organisms called methanogens that efficiently reduce carbon dioxide to methane. When the microbes receive an electric jolt, Logan reported in March, they use the electrons to combine CO2 and protons, creating methane gas. Methane can be stored and later used to fuel a vehicle or run a generator. Exploiting the microbes’ chemistry might be a way to make inconsistent energy sources like wind and solar more practical.

Along the same lines, MIT materials scientist Angela Belcher has engineered viruses to help store electricity. Her genetically modified bacteriophages (viruses that infect bacteria) cloak themselves in iron phosphate, a metal salt, then attach to carbon nanotubes to produce a framework of microscopic conductive wires that can hold a charge just like a car battery. Genetic tweaks enabled the virus to bind tightly to the carbon nanotube, creating a high-powered battery, as she described in a May issue of Science. Unlike traditional battery manufacturing, the process requires no toxic chemicals and can be set up very cheaply. Belcher is working to improve the batteries’ storage capacity further by experimenting with different virus-coat materials.

1 free article left
Want More? Get unlimited access for as low as $1.99/month

Already a subscriber?

Register or Log In

1 free articleSubscribe
Magazine Examples
Want more?

Keep reading for as low as $1.99!

Subscribe

Already a subscriber?

Register or Log In

More From Discover
Recommendations From Our Store
Shop Now
Stay Curious
Join
Our List

Sign up for our weekly science updates.

 
Subscribe
To The Magazine

Save up to 70% off the cover price when you subscribe to Discover magazine.

Copyright © 2021 Kalmbach Media Co.