materials structure (IMAGE) Penn State Caption Researchers doped cobalt oxide with tin to create a more efficient electrode for use in supercapacitors. This microscopic image shows the new material on graphene film. Credit JIA ZHU/PENN STATE Usage Restrictions non commercial use only License Licensed content 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.