Xueli Zheng and Bo Zhang, University of Toronto Faculty of Applied Science & Engineering (image) University of Toronto Faculty of Applied Science & Engineering Share Print E-Mail Caption Researchers Xueli Zheng, left, and Bo Zhang test a previous catalyst for the artificial photosynthesis system. The new catalyst works at lower pH, leading to an improvement in the overall efficiency of the system. Credit Marit Mitchell Usage Restrictions None Share Print E-Mail 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.