Methane Art (IMAGE) Washington State University Caption Methane carbon-hydrogen bond activation over nickel clusters (silver spheres) is promoted by low concentrations of surface carbon (brown spheres within the nickel cluster) or by a positive electric field. Credit Washington State University 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.