Outside Back Cover: Volume 4 Issue 5

Outside back cover image: Metal sulfur battery, which allows for storing electrical energy at low cost, is highly appealing to the long-term needs of future society. While being able to succeed in real application, some stiff hurdles derived from complicated conversion reactions in cell operation need to be overcome. Over the past, burgeoning concerns have focused on smart cathode design to delicately tailor the physiochemical interactions between the sulfur hosts and polysulfides. We summarize the recent key progress made in two-dimensional host materials, with deep mechanism exploration of enhanced polysulfide adsorption as well as accelerated conversion rate. This review will provide prospective fundamental guidance for the future sulfur host design and beyond. (DOI: https://doi.org/10.1002/smm2.1186)