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Can candle soot help power Electric Vehicles?

Can candle soot help power Electric Vehicles?

Technology News |
By eeNews Europe



The discovery opens up the possibilities to use carbon in more powerful batteries which will drive down the costs of portable power.

Dr. Chandra Sharma and Dr. Manohar Kakunuri from the Indian Institute of Technology found that because of the shape and configuration of the tiny carbon nanoparticles, the carbon in candle soot is suitable for use in bigger batteries. The soot can also be produced quickly and easily, it is a scalable approach to making batteries.

“If you put a water droplet on candle soot it rolls off – that’s an observation that’s been made in the last few years. The material candle soot is made of, carbon, also has electric potential. So why not use it as an electrode?” asked Dr. Sharma, author of the study from the Indian Institute of Technology. “We looked into it and saw it also shows some exceptional electrochemical properties, so we decided to test it further.”

When a candle burns, it gives off clouds of black soot made of carbon. The researchers looked at the soot collected from the tip of a candle flame and from the middle of the flame and compared the size, shape and structure of the carbon. The results showed that the burning process forms nanoparticles of carbon that are 30-40 nm across and are joined together in an interconnected network. They also found that the soot recovered from the tip of a candle flame, which burns at 1400°C, has fewer impurities like wax, making it perform better as an electrical conductor.

The researchers then analyzed the effectiveness of the soot as a conducting material to use in a battery. The effectiveness of batteries and materials used in batteries can be tested through a technique called cyclic charge-discharge (CCD). The rate of charge/discharge reflects how powerful the battery is; the higher the rate, the more powerful the battery; the results showed that the candle soot carbon performed best at higher rates.

The shape and size of the carbon nanoparticles, and the way they are joined together, means candle soot is a suitable material to use in electric car batteries. Not only is the technology efficient and cost-effective, it is also scalable. Dr. Sharma estimates that one hybrid car would need ten kilograms of carbon soot, which would be deposited in about an hour using candles.

“Generally we overlook the simpler things; candle soot is not new but we’re only now looking at it as a potential source of carbon,” said Dr. Sharma. “We’re very excited about the results. This new approach is very easy and the costs involved are minimal – it would make battery production cheaper.”


The researchers now plan to develop a candle soot battery to test the technology further. They are also planning to test hybrid materials that contain candle soot to see if they can make it an even better material for batteries.

Reference
‘Candle Soot derived Fractal-like Carbon Nanoparticles Network as High-Rate Lithium Ion Battery Anode Material’ by Manohar Kakunuri and Chandra S. Sharma (doi: 10.1016/j.electacta.2015.08.124). The article appears in Electrochimica Acta, Volume 180 (October 2015), published by Elsevier.

Related articles and links:

www.sciencedirect.com/science/article/pii/S0013468615303728

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