Graphite Nanosheets as Multifunctional Nanoinclusions to Boost the Thermoelectric Performance of the Shear‐Exfoliated Bi ₂ O ₂ Se

As an eco-friendly oxide-based thermoelectric material, Bi2O2Se exhibits considerable potential for practical device application, but its low electrical conductivity needs to be further improved achieve higher performance. Here, a record-high figure of merit, ZT >0.7 at 773 K in the shear-exfoliated nanostructured with graphite nanosheets as multifunctional secondary nanoinclusions, is achieved. The introduced regularize arrangement nanograins, strengthen anisotropy, and act “expressway” improve by simultaneously enhancing electron carrier concentration mobility hybrid materials, leading high power factor ≈6.0 µW cm–1 K–2 K. Also, liquid-phase shear exfoliation refines both into nanosheets. Moreover, as-sintered bulk materials composed these possess dense grain phase boundaries, well various lattice imperfections, such distortions stacking faults formed physical shearing, which can significantly scatter phonons different wavelengths turn contribute thermal only 0.63 W m–1 K–1 K, contributing competitive ≈0.73 this temperature, indicating great applications.