Scientists at the National University of Singapore (NUS) have created a microporous covalent organic framework with dense donor–acceptor lattices . This approach employs toxic solvents and expensive noble-metal catalysts, and generates substantial waste from side reactions . In contrast, photocatalytic production of H 2 O 2 from oxygen and water offers an energy-efficient, mild and clean route . The research team led by Professor Jiang Donglin from the NUS Department of Chemistry has developed