Sulfur-mediated transformation from osmium nanocrystals to single atoms for efficient alkaline hydrogen evolution reaction - Wendan Xue; Qixing Zhou; Pengfei Wang; Sijin Zuo; Fengxiang Li; Jiwei Jiang; Fan Mo; Chuan Yin; Gaolei Liu; Zhan Ban; Yuanyuan Wei; Wen An; et al. (Proceedings of the National Academy of Sciences, 2025)