This　article　presents　a　comprehensive　and　innovative　investigation　into　the　influence　of　vacuum　thickness　on　the　electronic,　optical,　and　thermodynamic　properties　of　two-dimensional　(2D)　Ta₂C　MXene　using　advanced　first-principles　simulations.　As　MXenes　emerge　as　front-runners　in　various　high-impact　industrial　applications,　understanding　the　nuances　of　their　properties　is　paramount.　Our　findings　reveal　that　vacuum　thickness　significantly　affects　the　electronic　characteristics　of　Ta₂C　MXene.　Additionally,　our　detailed　analysis　of　optical　properties　including　dielectric　function,　reflectivity,　refractive　index,　and　extinction　coefficient　demonstrates　a　consistent　enhancement　in　these　parameters　with　increasing　vacuum　thickness,　underscoring　the　tunability　of　Ta₂C　MXene　for　specific　optical　applications.　Furthermore,　variations　in　vacuum　thickness　leads　to　significant　changes　in　thermodynamic　properties　under　different　temperature　conditions.　This　research　not　only　deepens　our　understanding　of　Ta₂C　MXene　but　also　provides　pivotal　insights　for　the　development　of　next-generation　technologies,　solidifying　the　role　of　vacuum　engineering　in　optimizing　MXene-based　materials　for　energy　storage　devices.　©　2025　Elsevier　Ltd