As　a　possible　anode　for　the　next　generation　of　electrochemical　energy　storage　batteries,　potassium　metal　has　attracted　a　great　deal　of　attention　in　recent　years.　However,　potassium　metal　batteries　suffer　from　poor　stability　and　low　coulombic　efficiency　due　to　unfavorable　dendrite　growth　and　severe　volume　expansion　of　potassium　metal　anodes　during　charge　and　discharge　processes.　Here,　a　strategy　is　developed　to　inhibit　dendrite　growth,　reduce　volume　expansion　and　improve　the　stability　of　the　potassium　metal　anode　by　using　three-dimensional　(3D)　copper　foam　chemically　loaded　with　a　thin　layer　of　uniform　gold　particles　(Au/Cu)　as　the　anode　substrate.　As　the　host　of　potassium　deposition　for　forming　K/Au/Cu　foam　anode,　such　a　3D　copper　foam　with　large　specific　surface　area　can　reduce　the　potassium　deposition　current　density.　The　gold　particles　on　the　Cu　foam　surface　with　a　good　affinity　to　potassium　can　reduce　the　potassium　deposition　overpotential,　provide　deposition　sites　and　realize　uniform　and　dense　deposition.　As　a　result,　a　stable　cycle　of　more　than　500　cycles　is　achieved　by　using　such　a　K/Au/Cu　foam　anode.　A　full　cell　with　K/Au/Cu　foam　anode　and　Prussian　blue　cathode　delivers　much　better　coulombic　efficiency,　cycle　stability　and　low-temperature　performance　when　compared　to　that　without　gold　deposition　anode　(K/Cu).　Both　the　experimental　characterization　for　material　structure/morphology/composition　and　theoretical　DFT　calculations　are　carried　out　for　fundamental　understanding　of　the　performance　enhancement　mechanism.　The　main　advantages　of　this　3D　K/Au/Cu　foam　are　its　potassiophilicity　and　less　volume　expansion　during　charge/discharge　processes,　which　can　reduce　or　eliminate　the　potassium　dendrite　growth　through　forming　favorable　and　stable　solid　electrolyte　interface.　©　2022　Wiley-VCH　GmbH.