▎ 摘　　要

Silver Selenide (Ag2Se), a promising thermoelectric (TE) material due to its high proficient performance in (300-400) K. In this report, Ag2Se and its composites with reduced graphene oxide (rGO) were synthesized by sonochemical assisted hydrothermal method followed by hotpress densification technique. The structural analysis confirmed the orthorhombic phase of Ag2Se and the composition of Ag-Se-Ag with rGO is confirmed from binding energy shift in X-ray photoelectron spectroscopy (XPS) analysis. The phase transition from orthorhombic to cubic phase is identified around (390-450) K from TG-DTA analysis. For 30 wt % of rGO in Ag2Se, the very low thermal conductivity (kappa) of -0.492 Wm(- 1)K(-1) is obtained at 333 K. The maximum zT of -0.39 is achieved at 363 K for Ag2Se with 30 wt % rGO. The facile synthesis with modification by rGO shows the untapped potential of very low thermal conductivity in Ag2Se that is yet to be uncovered for TE generators.