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Although Janus TMDs mitigates this issue by activating the basal plane through an inherent vertical asymmetry structure and synthesis\u2010induced chalcogen vacancies, achieving a high density of edge sites and exploring their interplay with Janus dipole remains a critical challenge. Herein, we demonstrate a strain\u2010driven crack engineering strategy for monolayer Janus WSeS. The lattice strain inherent in the room\u2010temperature sulfurization conversion from WSe\n                    <jats:sub>2<\/jats:sub>\n                    to Janus WSeS spontaneously induces a dense distribution of nanoscale cracks, creating abundant active edges. In addition, these crack edges synergistically interact with sulfur vacancies to modulate the electronic states near\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>F<\/jats:sub>\n                    and optimize the hydrogen adsorption\/desorption kinetics for enhanced HER activity. The resulting material achieves outstanding HER performance in acidic electrolyte, with a low overpotential of 214\u00a0mV at 10\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    and a Tafel slope of 68\u00a0mV dec\n                    <jats:sup>\u22121<\/jats:sup>\n                    . This work provides an approach to precisely tailor edge morphology in 2D materials, bridging the structure\u2013performance relationship for advanced electrocatalysis.\n                  <\/jats:p>","DOI":"10.1002\/anie.2242006","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T03:52:49Z","timestamp":1790740369000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Edge\u2010Vacancy Synergy in Cracked Janus WSeS Monolayers for Efficient Hydrogen Evolution"],"prefix":"10.1002","author":[{"given":"Yi","family":"Zhou","sequence":"first","affiliation":[{"name":"Department of Chemistry Zhejiang Key Laboratory of Excited\u2010State Energy Conversion and Energy Storage State Key Laboratory of Silicon Materials Zhejiang University  Hangzhou P. R. 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