The highly efficient degradation and purification of organic pollutants in waste water by photocatalysis is still challenging. Herein, a piezoelectric potential activated interfacial electric field (IEF) was constructed to endow BiFeO₃@BaTiO₃ (BFO@BTO) heterojunction as a round-the-clock photocatalyst for polluted water remediation. BFO@BTO heterojunction composited with BiFeO₃ nanoparticles decorated on the surface of BaTiO₃ nanorods, shortens the carrier migration path. More importantly, IEF can be activated and reconstructed under ultrasonic waves irradiation, leading to the lower potential barrier and the enhanced separation efficiency for photogenerated carriers. Impressively, the degradation rate constant k value of BFO@BTO heterojunction reached up to 0.038 min^-1, which was 1.9 and 7.0 times higher than that of piezocatalysis and photocatalysis alone, respectively. It also exhibited excellent stability in three light-dark cycles for high concentration (25 mg·L^-1) of rhodamine B and tetracycline hydrochloride. This study provides a promising strategy to design highly active photo-assisted piezocatalysts for environmental energy utilization and round-the-clock catalysis.

SiGe is recognised as an excellent thermoelectric material with superior mechanical properties and thermal stability in regions with high temperatures. This study explores a novel strategy for co-regulating thermoelectric transport parameters to achieve high thermoelectric properties of p-type SiGe in the mid-temperature region by incorporating nano-TaC into SiGe combined ball milling with spark plasma sintering. By optimizing the amount of TaC in the SiGe matrix, the power factors were significantly increased due to the modulation doping effect based on the work function matching of SiGe with TaC. Simultaneously, the ensemble effect of the nanostructure leads to a significant decrease in thermal conductivity. Thus, a high ZT of 1.06 was accomplished at 873 K, which is 64 % higher than that of typical radioisotope thermoelectric generator. Our research offers a novel strategy for expanding and enhancing the thermoelectric properties of SiGe materials in the medium temperature range.