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'Unzipped' Carbon Nanotubes Could Help Energize Fuel Cells And Batteries

Multi-walled carbon nanotubes riddled with defects and impurities on the outside could replace some of the expensive platinum catalysts used in fuel cells and metal-air batteries, according to scientists at Stanford University. The carbon nanotube is a rolled-up sheet of pure carbon, commonly called graphene, which is one-atom thick and more than 10,000 times narrower than a human hair.  Carbon nanotubes are a promising low-cost alternative because they are excellent conductors of electricity and relatively inexpensive to produce.
Image credit: Guosong Hong