Harvesting　waste　heat　into　electricity　through　thermoelectric　(TE)　material　can　make　a　great　contribution　to　reducing　energy　consumption　and　environment　pollution.　Cu2S　has　proved　itself　to　be　a　highly　promising　TE　material,　whereas　the　poor　electrical　property　restricts　its　practical　application.　Therefore,　the　way　to　improve　its　electrical　property　by　doping　elements　with　high　carrier　concentration　in　an　environmental-friendly　method　accelerate　its　application.　Herein,　Ag　nanoparticles　are　incorporated　into　a　p-type　Cu2S　(Ag/Cu2S)　by　a　facile　hydrothermal　method　to　improve　the　thermoelectric　properties.　The　introduction　of　Ag　can　effectively　tune　the　carrier　concentration,　resulting　in　a　high　power　factor　of　1698　mu　W　m(-1)　K-2;　meanwhile,　Ag　doping　can　also　enhance　the　phonon　scattering,　further　reducing　the　thermal　conductivity.　Eventually,　a　ZT(max)　peak　value　approximate　to　1.4　@　773　K　is　achieved　in　the　0.5　wt%　Ag-doped　Cu2S　samples.　The　design　principle　for　Ag/Cu2S　composites　opens　up　a　new　pathway　for　the　synthesis　and　application　of　thermoelectric　material.　(C)　2022　Elsevier　B.V.　All　rights　reserved.