Potassium　metal　battery　(KMB)　have　been　recognized　as　a　feasible　alternative　electrochemical　energy　device　for　practical　application.　However,　the　dendrite　growth　and　the　instability　of　the　potassium　anode　are　the　major　issues　hindering　its　practicability.　In　this　paper,　a　layer　of　Pd　is　coated　on　the　rib　surface　of　Cu　foam　through　a　replacement　reaction　in　the　liquid-phase　synthesis　to　form　Pd/Cu　foam　current　collector,　and　then　K　metal　is　deposited　on　this　Pd/Cu　foam　to　prepare　the　K/Pd/Cu　foam　anode　material　for　KMBs.　This　K/Pd/Cu　foam　is　assembled　into　a　KMB　using　Prussian　blue　(PB)　as　the　cathode　material　to　achieve　high　capacity　and　cycle-ability　even　at　low-temperature　(−　20　°C).　Experimental　results　confirm　that　this　K/Pd/Cu　foam　can　significantly　reduce　K　dendrite　growth,　increase　K+　ion　diffusion　within　the　solid　electrolyte　interface　(SEI)　film　and　reduce　the　side　reaction.　Based　on　the　experiment　measurements,　material　characterization,　and　theoretical　DFT　calculations,　the　possible　enhancement　mechanism　of　the　highly　potassiophilic　interface　of　Pd/Cu　foam　during　the　cycling　of　KMB　is　also　explored.　©　2022　Elsevier　Ltd