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"Municipal transit agencies have tried to reduce the carbon footprint of their bus fleets using a range of options over the years, from biofuels and hydrogen to batteries and hybrid-electric diesel. Now a Chinese company and its U.S. partner say that ultracapacitors could offer the greenest and most economical way of powering inner-city buses."

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A research group at the University of Texas at Austin has taken a carbon-based nanomaterial called graphene, and developed it into a device that has the potential to vastly improve upon the energy storage capacity of batteries. Reportedly, graphene could also double the current maximum storage capacity of the group of battery alternatives known as ultracapacitors

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An advance by researchers at the Research Institute of Chemical Defense, in China, could boost ultracapacitors' ability to store energy.

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