Corncob-Biochar Supercapacitor (image) University of Illinois at Urbana-Champaign Caption This corncob-biochar supercapacitor generates enough energy to power an LED bulb. Wood biochar is easier to use in large-scale applications and has more energy potential. Credit L. Brian Stauffer Usage Restrictions Image may be used only to accompany stories about the research described in this release. Credit required: L. Brian Stauffer Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.