Researchers advance understanding of energy storage mechanisms in supercapacitors

Mar 05, 2012

An international team of materials researchers including Drexel University's Dr. Yury Gogotsi has given the engineering world a better look at the inner functions of the electrodes of supercapacitors – the low-cost, lightweight energy storage devices used in many electronics, transportation and many other applications. In a piece published in the March 4 edition of Nature Materials, Gogotsi, and his collaborators from universities in France and England, take another step toward finding a solution to the world's demand for sustainable energy sources.

Gogotsi, a professor in Drexel's College of Engineering and director of the A.J. Drexel Nanotechnology Institute, teamed with Mathieu Salanne, Céline Merlet and Benjamin Rotenberg from the Université Paris 06, Paul A. Madden from Oxford University and Patrice Simon and Pierre-Louis Taberna of Université Paul Sabatier. What the group has produced is the first quantitative picture of the structure of ionic liquid absorbed inside disordered microporous carbon in supercapacitors. Supercapacitors have the capability of storing and delivering more power than batteries; moreover, they can last for up to a million of charge-discharge cycles. These characteristics are significant because of the intermittent nature of renewable energy production.

According to the researchers, the excellent performance of is due to ion adsorption in porous carbon electrodes. The molecular mechanism of ion behavior in pores smaller than one nanometer-one billionth of a meter- remains poorly understood. The mechanism proposed in this research opens the door for the design of materials with improved capabilities.

The authors suggest that in order to build higher-performance materials, researchers should know whether the increase in energy storage is due to only a large surface area or if the pore size and geometry also play a role. The results of this study provide guidance for development of better electrical energy storage devices that will ultimately enable wide utilization of renewable energy sources.

"This breakthrough in understanding of energy storage mechanisms became possible due to collaboration between research groups from four universities in three countries," Gogotsi said. "Moreover, the team used carbon structure models developed by our colleagues Dr. Jeremy Palmer and Dr. Keith Gubbins from the North Carolina State University. This is a clear demonstration of the importance of collaboration between scientists working in different disciplines and even in different countries."

Explore further: Atom-thick CCD could capture images: Scientists develop two-dimensional, light-sensitive material

More information: C. Merlet, B. Rotenberg, P.A. Madden, P.-L. Taberna, P. Simon, Y. Gogotsi, and M. Salanne, On the molecular origin of supercapacitance in nanoporous carbon electrodes, Nature Materials (2012) DOI: 10.1038/NMAT3260

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Jeddy_Mctedder
1 / 5 (1) Mar 05, 2012
capacitors will win the transportable electricity wars. batteries are a dead end for vehicle storage of electricity because they will never carry energy as densely and as cheaply as synethic or natural fuels. combustion or catalytic oxidation are always going to destroy battery chemistry---capacitors will smooth the energy demand load and create massive efficiencies and reduce the maintanance and wear on the vehicle's energy generation system. look at the yocar by russia.

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