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The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
  • 2015-01-30 11:00:00
  • Article ID: 629012

Transforming Biochar Into Activated Carbon

Bioprocessing engineer turns agricultural residue into energy storage material

  • Credit: Photo by Emily Weber

    Doctoral student KeLiang Wang places a graphene-coated electrode into a button cell to make a supercapacitor.

  • Credit: Photo by Emily Weber

    Doctoral student KeLiang Wang pours dried distillers grain solids, an ethanol byproduct, into a crucible to begin the process of transforming it into graphene.

  • Credit: Photo by Emily Weber

    Golden-colored dried distillers grain solids (DDGS) are heated in an oven flooded with nitrogen gas to produce biochar, which can then be converted to graphene, and ultimately used for energy storage in supercapacitors.

  • Credit: Photo by Emily Weber

    Biochar, left, is converted to graphene by mixing it with a chemical called a catalyst, drying it and then heating it in the oven at a specific temperature once again with nitrogen gas for one hour.

It’s about transforming corn stover, dried distillers grain solids (DDGS) and even native grasses into a product more than 1,000 times more valuable—graphene.

The pyrolysis process turns plant materials into bio-oil and biochar, according to assistant professor Zhengrong Gu of the South Dakota State University agricultural and biosystems engineering department. When the bio-oil is further processed, it becomes biofuel.

Gu is converting biochar, a charcoal-like material, into graphene which can be used in place of expensive, activated carbon to coat the electrodes of energy storage devices—supercapacitors.

Small engines use start-up and run capacitors, Gu explained, but supercapacitors have more rapid charge and discharge rates as well as a higher energy storage capacity. Unlike conventional batteries, supercapacitors can withstand low temperatures.

To manufacture these storage devices, the United States now imports most of its activated carbon from Asia—including Japan, Thailand and China. “We can use these abundant agricultural materials as biofuel to reduce our dependence on petroleum and, at the same time, generate good active carbon to export,” Gu said.

Increasing product value

Gu estimated that approximately 2.2 pounds of graphene is worth at least $1,000. A pound of DDGS costs 7.5 to 9 cents and converts to approximately 7 ounces of graphene.

“That’s the increased value of the product,” Gu said. “We can convert agricultural residue to a high-value product that is easy to ship.”

Once the DDGS or corn stover is transformed to biochar, Gu mixes chemical called a catalyst with the biochar and heats the mixture to 1,292 degrees Fahrenheit for one hour to make porous graphene.

“It’s a one-step process,” he said. He estimated production costs, including feedstock, at about $1.36 for a pound of graphene.

Using the native grass big blue stem as the feedstock, Gu said, “we save more on feedstock.”

In addition, Gu hopes to adapt a new plasma processing technique developed at SDSU that reduces the processing time to five minutes and the temperature to 302 degrees Fahrenheit to convert biochar to graphene.

That could result in a significant cost savings, he added.

Optimizing material properties

Though Gu’s processing method generates graphene with the properties needed to capture and discharge electricity, he admitted, “We don’t know how the reaction happens.”

Through a $775,155 grant from the National Science Foundation along with $332,210 in university matching funds, Gu and a team of SDSU researchers studying carbon materials and biofuel technologies have purchased a transmission electron microscope will help advance this and other projects campuswide. The instrument should arrive this spring.

“We can find out how the process happens and learn how to change the parameters to improve the end product,” Gu said.

With the microscope, he and his team can determine the internal material structure and how the morphology changes its energy storage properties much like doctors use a CT scan to examine the human body, Gu explained. They can also find out whether biochar from one type of feedstock produces better graphene than another.

About South Dakota State University

Founded in 1881, South Dakota State University is the state’s Morrill Act land-grant institution as well as its largest, most comprehensive school of higher education. SDSU confers degrees from eight different colleges representing more than 175 majors, minors and specializations. The institution also offers 32 master’s degree programs, 15 Ph.D. and two professional programs. The work of the university is carried out on a residential campus in Brookings, at sites in Sioux Falls, Pierre and Rapid City, and through Cooperative Extension offices and Agricultural Experiment Station research sites across the state.

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Argonne to Install Comanche System to Explore ARM Technology for High-Performance Computing

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The Challenge of Estimating Alaska's Soil Carbon Stocks

A geospatial analysis determined the optimal distribution of sites needed to reliably estimate Alaska's vast soil carbon.

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Molecular-level understanding of cellulose structure reveals why it resists degradation and could lead to cost-effective biofuels.

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