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Here, we report a vanadium nitride quantum dot\u2010graphene (VNQ\u2010G) composite bidirectional catalyst that accelerates the reversible conversion of polysulfides during both discharging and charging for room\u2010temperature sodium\u2013sulfur (Na\u2013S) batteries. The VNQ\u2010G composite with a quantum\u2010confined VNQ catalyst and a conductive graphene scaffold enables strong d\u2013p hybridization with sodium polysulfide, accelerating redox kinetics and ensuring effective polysulfide trapping and utilization during discharge, and accelerating Na\n                    <jats:sub>2<\/jats:sub>\n                    S oxidation to soluble polysulfides during charging. As a result, the Na\u2010S battery employing VNQ\u2010G effectively mitigates the shuttle effect, delivering a maximum capacity of 302\u00a0mAh\u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 1C, maintaining 70% of its capacity over 400 cycles, and achieving a specific capacity of approximately 30\u00a0Ah per dollar of electrolyte. Our study demonstrates that the bidirectional catalyst is a critical factor in the reversibility of Na\u2013S, and establishes that VNQ\u2010G is a practical interfacial design strategy for realizing high\u2010performance, cost\u2010effective Na\u2013S batteries.\n                  <\/jats:p>","DOI":"10.1002\/smll.74517","type":"journal-article","created":{"date-parts":[[2026,7,8]],"date-time":"2026-07-08T10:59:40Z","timestamp":1783508380000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Vanadium Nitride Quantum\u2010Dot Bidirectional Catalysis for Accelerated Polysulfide Redox in Room\u2010Temperature Na\u2013S Batteries"],"prefix":"10.1002","volume":"22","author":[{"given":"Hun\u2010Seong","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Energy System Engineering Gyeongsang National University  Gyeongnam South 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