Schematic of Interfacial Catalysis (IMAGE) Science China Press Caption (a) Different activity descriptors for electrochemical reactions and catalytic cycles of (b) hydrogen evolution reaction, (c) oxygen evolution reaction and (d) oxygen reduction reaction in fuel cells. Credit ©Science China Press 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.