Protonation (IMAGE) The University of Hong Kong Caption Chemists at HKU discover a fundamental catalyst protonation process to enhance productivity of solar-driven water-splitting for hydrogen by eight times, catalysing green energy without CO2 emissions. Credit The University of Hong Kong Usage Restrictions N/A 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.