Back Cover Image, Volume 7, Number 5, May 2025

Back cover image: Regulating the freedom and distribution of H2O molecules is crucial for enlarging the electrochemical window of aqueous electrolytes. Hao and Qiu et al. fabricated a heterogel electrolyte by utilizing the bicontinuous microemulsion as template. In this image, the brown pipelike passage represents the interpenetrating oil phase, while the green “tadpole-shaped” objects are actually the surfactant Tween 20. The hydrophobic tail of the surfactant tends to orderly assemble at the electrode surface and enrich the oil phase to create a hydrophobic interfacial microenvironment, thus preventing the proximity of H2O molecules, resulting in an expanded electrochemical window. Article number: 10.1002/cey2.697