Polyamide Membrane Photocatalysts with Turing Surface Structure and Asymmetric Local High‐Charge‐Density Domains for Superior Photocatalytic Hydrogen Peroxide Production

Abstract Hydrogen peroxide (H 2 O 2 ) is a crucial chemical in various industrial applications, yet developing efficient photocatalysts remains a key challenge. Here, the design of polyamide membrane photocatalysts with Turing surface structure and asymmetric local high‐charge‐density domains via an ice interface polymerization strategy for superior photocatalytic H 2 O 2 production is reported. The N‐enriched polymeric backbone enhances local charge density, while the Turing surface pattern significantly improves the exposed photoactive sites and reactant accessibility. The Turing membrane exhibits a superior H 2 O 2 photosynthetic yield, sixfold higher than that of a flat membrane, while also exhibiting excellent recyclability and long‐term stability. To advance practical applications, a prototype channel reactor designed to introduce a sacrificial agent while ensuring high product purity is proposed. Utilizing this reactor, an exceptional H 2 O 2 yield of 5773 µmol g −1 h −1 compared to earlier reported reactors is achieved. Furthermore, the reactor cost is ≈50% lower than standard market prices, with carbon emissions reduced to just 0.9% compared to the industrial process. Moreover, the channel reactor also demonstrates high performance in organic dye degradation, achieving a degradation efficiency of 91%. This study establishes a promising strategy for photocatalytic H 2 O 2 production, offering a scalable, efficient, and environmentally sustainable approach for diverse industrial applications.