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Identification of novel materials with enhanced thermoelectric (TE)performance is critical for advancing TE research. In this direction, this isthe first report on TE properties of low-cost, nontoxic, and abundantcore-shell Cu@Cu2O nanocomposites (NCs) synthesized using a facile and cheapsolution-phase method. They show ultralow thermal conductivity of nearly 10-3of copper bulk value, large thermopower ~0.373 mVK-1, and consequently, a TEfigure of merit (ZT) of 0.16 at 320 K which is larger than those of many of thepotential TE materials such as PbTe, SnSe and SiGe, showing its potential forTE applications. The ultralow thermal conductivity is mainly attributed to themultiscale phonon scattering from intrinsic defects in Cu2O, grain boundaries(GBs), lattice-mismatched interface as well as dissimilar vibrationalproperties. The large thermopower is associated with sharp modulation incarrier density of states (DOS) due to charge transfer between Cu and Cu2Onanoparticles (NPs), and carrier energy filtering.

Ultralow Thermal Conductivity and Large Figure of Merit in Low-Cost and Nontoxic Core-Shell Cu@Cu2O Nanocomposites