This news item is from the Technology review website. Looks like strides in mass transportation is surging. The rest of the news item can be read a at TR
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.
Fast charger: A bus that runs entirely on ultracapacitors charges up at a bus stop in Shanghai. The buses can only travel three to five miles between charges, but the ultracapacitors allow for fast recharging at designated bus stops.
Credit: Sinautec Automobile Technologies
There's just one catch: the best ultracapacitors can only store about 5 percent of the energy that lithium-ion batteries hold, limiting them to a couple of miles per charge. This makes them ineffective as an energy storage medium for passenger vehicles. But what ultracapacitors lack in range they make up in their ability to rapidly charge and discharge. So in vehicles that have to stop frequently and predictably as part of normal operation, energy storage based exclusively on ultracapacitors begins to make sense.
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Ultracapacitors are definitely not batteries. They are much more enhanced and larger versions of ordinary capacitors. They were most definitely made out of some exotic materials, with a higher number of plates and dielectrics and the plates having a larger surface area. Capacitors are charge storage devices found in virtually all electronic devices. Method of releasing their charge can be regulated by means of variable resistors.
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