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A well-ordered highly crystalline g-C 3 N 4 nanorods (CNR) is rationally tailored by molten salt-assisted anti-defect engineering for efficient artificial photosynthesis of H 2 O 2. [Display omitted] • Highly crystalline and well-ordered g-C 3 N 4 nanorods are tailored. • Molten salt-assisted preparation of highly crystalline organic polymeric materials. • Anti-defect engineering promotes charge separation and transfer. • The H 2 O 2 generation rate reaches 1.58 mmol g-1h−1 only using air as oxygen source. • Molten salt-assisted anti-defect engineering to improve photocatalytic activity. Graphite carbon nitride (g-C 3 N 4) is widely recognized as one of the most popular catalysts for photocatalytic hydrogen peroxide (H 2 O 2) production. However, it is often overlooked that general g-C 3 N 4 materials contain numerous dangling bonds and defects, which serve as recombination centers for photogenerated carriers and significantly hinder their catalytic activity. Herein, we present a novel approach to address this issue by rationally tailoring well-ordered g-C 3 N 4 nanorods (CNR) through molten salt-assisted anti-defect engineering. The resulting highly crystalline CNR demonstrates high efficiency in the artificial photosynthesis of H 2 O 2. Experimental results indicate that enhancing the crystallinity of g-C 3 N 4 while reducing the defect concentration effectively promotes charge separation and transport. As a result, it exhibits a remarkable H 2 O 2 generation rate of 1.58 mmol g-1h−1 using air as the oxygen source, accompanied by an apparent quantum yield of 18.00 % (λ = 400 nm). The excellent photocatalytic performance of CNR surpasses that of all previously reported pristine g-C 3 N 4 materials. This work sheds light on the effectiveness of molten salt-assisted anti-defect engineering in improving catalyst activity, with potential applications in solar cells, sensor devices and other catalytic systems. [ABSTRACT FROM AUTHOR]

A fantastic 2D/1D hierarchical layered ZnIn 2 S 4 /TiO 2 hetero-structure is reported as an efficient catalyst for in- situ H 2 O 2 production via 2-electrons oxygen reduction (ORR) process and be activated to high concentration hydroxyl radical (•OH) for water purification under visible light irradiation. [Display omitted] • Solar-driven H 2 O 2 synthesis to purify water via cascade reaction. • A fantastic 2D/1D hierarchical layered heterojunction of ZnIn 2 S 4 /TiO 2. • ZnIn 2 S 4 effectively promote the activation of in- situ generated H 2 O 2. • The superior H 2 O 2 production rate arrives 1530.59 μmol h−1 g−1. Hydrogen peroxide (H 2 O 2) is a significant green oxidant for environment and new energy, especially for Fenton-like system. Onsite production and sustainable consumption of H 2 O 2 are the two critical challenges. Here, a fantastic 2D/1D hierarchical layered ZnIn 2 S 4 /TiO 2 heterojunction is reported as an efficient catalyst for in- situ H 2 O 2 production via 2-electrons oxygen reduction (ORR) process and be rapidly activated to high concentration hydroxyl radical (•OH) for water purification under visible light irradiation. The high-quality catalyst enables superior H 2 O 2 production rate of 1530.59 μmol h−1 g−1 with an external quantum efficiency of 10.39% illuminated at 400 nm, is much higher than that of reported photocatalysts. The bimetallic sulfide ZnIn 2 S 4 can effectively promote the activation of H 2 O 2 due to the unsaturation of sulfur atoms, so that the wastewater containing tetracycline (50 ppm) can be degraded by 90% only within 60 min by ZnIn 2 S 4 /TiO 2 via this cascade reaction. This work provides a novel strategy and ZnIn 2 S 4 -based catalyst for photocatalytic Fenton-like reaction. [ABSTRACT FROM AUTHOR]