The designed power source (IMAGE) Proceedings of the National Academy of Sciences Caption The designed power source is composed of GO inks and rGO inks with different ion concentration and a pair of silver electrodes. Credit Image credit: Di Wei. Usage Restrictions None 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.