Efficient NH3-Tolerant Nickel-Based Hydrogen Oxidation Catalyst for Anion Exchange Membrane Fuel Cells (IMAGE) University of Science and Technology of China Caption Mechanisms of NH3 poisoning and electron states regulation. Credit Image by WANG Yehua et al. Usage Restrictions none License Original 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.