Cheaper, greener, alternative energy storage at Stevens

May 23, 2011

Every year, the world consumes 15 Terrawatts of power. Since the amount of annual harvestable solar energy has been estimated at 50 Terrawatts, students at Stevens Institute of Technology are working on a supercapacitor that will allow us to harness more of this renewable energy through biochar electrodes for supercapacitors, resulting in a cleaner, greener planet.

Supercapacitors are common today in solar panels and , but the material they use to store energy, activated carbon, is unsustainable and expensive. Biochar, on the other hand, represents a cheap, green alternative. The Chemical Engineering Senior Design team of Rachel Kenion, Liana Vaccari, and Katie Van Strander has designed biochar electrodes for supercapacitors, and is looking to eventually bring their solution to market. The group is advised by Dr. Woo Lee, the George Meade Bond Professor of Chemical Engineering and Materials Science.

For their project, the team designed, fabricated, and tested a prototype supercapacitor electrode. The group demonstrated biochar's feasibility as an alternative to activated carbon for electrodes, which can be used in hybrid electric automobile batteries or home in .

"While the team's findings are preliminary, the approach taken by us represents a small, but potentially very important step in realizing sustainable energy future over the next few decades," says Dr. Lee.

Biochar is viewed as a green solution to the activated carbon currently used in electrodes. Unlike activated carbon, biochar is the byproduct of the pyrolysis process used to produce biofuels. That is, biochar comes from the burning of organic matter. As the use of biofuels increases, biochar production increases as well. "With our process, we are able to take that biochar and put it to good use in supercapacitors. Our supply comes from goldenrod crop, and through an IP-protected process, most organics, metals, and other impurities are removed. It is a more sustainable method of production than activated carbon," Liana says. Another significant advantage: biochar is nontoxic and will not pollute the soil when it is tossed out. The team estimates that biochar costs almost half as much as activated carbon, and is more sustainable because it reuses the waste from production, a process with sustainable intentions to begin with.

One of the largest concerns for solar panel production today is the sheer cost of manufacturing supercapacitors. Current photovoltaic arrays rely on supercapacitors to store the energy that is harnessed from the sun. And while the growth rate of supercapacitors is advancing at 20 percent a year, their cost is still very high, in part because they require activated carbon. Biochar, on the other hand, is cheaper and readily available as a byproduct of a process already used in production.

"My favorite part of this project was seeing the creation of the prototype," Katie says. "It was cool to be able to hold it in my hand and test it and say that I made this."

"Using this technology, we can reduce the cost of manufacturing supercapacitors by lowering the cost of the electrodes," Katie says. "Our goal is eventually to manufacture these electrodes and sell them to a company that already makes supercapacitors. Once supercapacitors become cheaper, they will become more common and be integrated into more and more devices."

Explore further: Researchers open possible avenue to better electrolyte for lithium ion batteries

Provided by Stevens Institute of Technology

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User comments : 3

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unknownorgin
1 / 5 (1) May 24, 2011
What exactly is new here? Activated carbon has been made from coconut shell, walnut shells and many other high density organic materials for decades.
Biochar
not rated yet Jun 07, 2011
I think you are missing the Point Mr Unknown Origins. The point is sustainability and future tech. You are correct activated carbon has been happening for years but with the event of the propaganda of manmade climate change these students who by their very own admission are working on what they think will be a way for the future. Bravo to them with what they know are challenging the norm and creating a way through the suspicious energy stalemate we have been living in for the last 100 years.
Dolph Cooke
Founder
biocharproject org
(How on earth is this spaqm please ?)
(fix it or lose a subscriber)
J-n
not rated yet Jun 07, 2011
They don't allow folks to put in full website addresses because it prevents others from putting in sites that are not only spam, but intentionally malicious.

There are many more evil things you can do by sending someone to a website aside from trying to sell them things. By preventing the posting of websites it make it just that much more difficult for those who are maliciously minded to do just that.

Personally i would suggest adding the website to your Bio-Info and refer people to that, if you wish to give them a click-able link.

I hope that helps!

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