Strategic B-site cation engineering in Sillén–Aurivillius perovskite oxyhalides for ultra-high efficiency piezocatalytic H ₂ O ₂ production

under visible light irradiation-a 210.84-fold improvement over conventional photocatalysis, achieved without sacrificial agents. These findings establish a new paradigm in ferroelectric material design, combining computational prediction, structural innovation, and exceptional catalytic performance for sustainable chemical production.