Ag₂Se is a promising near-room-temperature thermoelectric material with prospective applications in solid-state cooling and waste heat recovery. To advance the practical application of Ag₂Se, it is imperative yet challenging to further boost its average dimensionless figure of merit (zT) and mechanical performance. Herein, we effectively enhance the two types of performance by constructing Ag₂Se/AgSbSe₂ composite architectures with uniform distribution of AgSbSe₂ inclusions, which was realized by sintering solution-synthesized mixtures of Ag₂Se nano/micro-particles and Sb₂Se₃ nanorods. Particulate AgSbSe₂ and as-built Ag₂Se/AgSbSe₂ interfaces enable intensified phonon scattering and impeded crack propagation, and refined grain size additionally contributes to optimized thermal and mechanical properties. As a result, (Ag₂Se)_0.98(2AgSbSe₂)_0.02 composite approaches a low lattice thermal conductivity of 0.15 W m^–1 K^–1 at 375 K and an excellent average zT of ∼0.89 between 300 and 375 K; mechanically, this composite obtains a compressive strength of 197.3 MPa, which is improved by ∼125% compared to that of Ag₂Se and represents the highest value ever reported for this compound. This study sheds light on the efficacy of introducing secondary-phase particles on simultaneously boosting the thermoelectric and mechanical performance of Ag₂Se.

Ag ₂ Se 是一种很有前途的近室温热电材料，在固态冷却和余热回收方面具有广阔的应用前景。_{为了推进 Ag 2} Se的实际应用，进一步提高其平均无量纲品质因数 ( zT ) 和机械性能势在必行，但也具有挑战性。在此，我们通过构建具有均匀分布的 AgSbSe _{2夹杂物的 Ag 2} Se/AgSbSe _{2复合结构有效地增强了两种类型的性能，这是通过烧结溶液合成的 Ag 2} Se 纳米/微粒和 Sb ₂ Se的混合物实现的₃纳米棒。颗粒状 AgSbSe₂和内置的 Ag ₂ Se/AgSbSe ₂界面可增强声子散射并阻止裂纹扩展，细化的晶粒尺寸还有助于优化热性能和机械性能。因此，(Ag ₂ Se) _0.98 (2AgSbSe ₂ ) _0.02复合材料在 375 K 时的晶格热导率低至 0.15 W m ^–1 K ^–1 ，在300 至 375 K 之间的平均zT极佳，约为 0.89；在机械方面，该复合材料获得了 197.3 MPa 的抗压强度，与 Ag _{2相比提高了约 125%}Se 和代表该化合物的最高值。这项研究阐明了引入二次相粒子对同时提高 Ag ₂ Se 的热电和机械性能的功效。