High　temperature　proton　exchange　membrane　fuel　cell　is　one　of　the　prominent　power　generators　without　consuming　fossil　fuels.　Meanwhile,　absorption　carbon　capture　system　plays　an　important　role　in　carbon　emission　reduction.　In　this　paper,　by　integrating　these　two　systems,　we　propose　a　novel　hybrid　system　to　achieve　improved　hydrogen　utilization　efficiency　and　negative　carbon　emission.　Considering　the　electrochemical　and　thermodynamic　irreversible　losses　involved,　as　well　as　the　matching　between　the　two　subsystems,　the　power　density　and　efficiency　for　each　subsystem　and　the　overall　system　are　derived　analytically.　The　optimal　performance　and　operation　of　the　hybrid　system　are　analyzed　and　discussed.　Notably,　compared　to　the　standalone　high　temperature　proton　exchange　membrane　fuel　cell,　the　maximum　power　density　of　the　hybrid　system　increases　by　24.0%　and　reaches　3933W⋅m−2　for　the　given　parameter　values,　and　the　corresponding　efficiency　rises　from　20.9%　to　23.1%.　Additionally,　the　impacts　of　key　parameters　are　investigated,　which　indicates　the　important　role　of　the　absorbent　with　appropriate　mass　to　heat　transfer　coefficient　ratio　in　performance　enhancement.　In　the　end,　the　performance　comparisons　with　various　hybrid　systems　based　on　high　temperature　proton　exchange　membrane　fuel　cell　are　presented.　The　outcomes　show　that　the　advanced　absorbents　with　higher　operating　temperature　lead　to　competitive　performance　of　the　proposed　hybrid　system.　©　2025　Elsevier　Ltd