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Bi4O4SeCl2 nanoinclusions enable heat-charge transport decoupling in Cu2Se thermoelectric composites
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DOI：10.1016/j.jeurceramsoc.2026.118731.png)
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Abstract
En 中文
Copper selenide (Cu₂Se) is a promising thermoelectric material, but its performance is limited by coupled heat and charge transport. Here, Bi₄O₄SeCl₂ (BOSC), a heteroanionic compound with intrinsically low thermal conductivity, was introduced as a nanoscale secondary phase in Cu₂Se. Cu₂Se powders were synthesized by ball-milling-assisted microwave hybrid heating, manually blended with 0.00–1.00 wt% BOSC, and consolidated by a second microwave treatment. BOSC incorporation preserved the mixed α-/β-Cu₂Se phase constitution while introducing heterogeneous interfaces, lattice strain, and defect-rich regions. These features increased carrier concentration, reduced mobility, and substantially suppressed total thermal conductivity, while the Seebeck coefficient, power factor, and weighted mobility remained comparatively well preserved at low-to-moderate BOSC contents. The 0.50 wt% BOSC composite achieved the best balance between electrical and thermal transport, reaching a maximum ZT of 0.76 at 450 °C. These results demonstrate the potential of BOSC-assisted interface engineering for improving Cu₂Se-based thermoelectrics.
Keywords:
Cu2Se
Bi4O4SeCl2
Thermoelectric composites
Heat–charge transport decoupling
Microwave hybrid heating
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6.2
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1.7W
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5.1W
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