Zn-SA-MoC/NCFs contributes iodine redox (IMAGE) Science China Press Caption Molybdenum carbide (MoC) nanoclusters embedded in porous nitrogen-doped carbon fibers with atomic Zn-N4 sites exhibit a physicochemical confinement effect on iodine species and enhance electron/ion transfer efficiency, facilitating the reversible redox conversion without polyiodide shuttle effects. Credit ©Science China Press Usage Restrictions Use with credit. 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.