Recyclable Near‐Hemispherical Aligned Porous Piezoceramics for Green Catalysts

Piezocatalytic technology exhibits great potential in the field of pollutant degradation. However, a major challenge is the difficulty of recovering powder‐based catalysts, which lead to secondary pollution of the environment. In this work, near‐hemispherical aligned porous barium strontium titanate (Ba 0.75 Sr 0.25 TiO 3 , BST) ceramics are prepared on the surface of superhydrophobic coatings by freeze‐casting method. The abundant aligned micropores of the ceramics provide opportunities for sufficient exchange of chemical substances between the ceramic and the solution, while the near‐hemispherical structure effectively improves the piezoelectric response. Under the synergistic effect of specific surface area and piezoelectric potential, BST ceramics with optimal dimensions exhibit the highest piezocatalytic degradation efficiency, reaching 59.1% in 120 min, with a first‐order kinetic rate constant k of 7.36 × 10 − 3 min − 1 . This study provides a new approach for the cost‐effective fabrication and performance optimization of green catalysts.