LAUSR

Hierarchical nano/micro-structured photocatalysts design draws attention to enhance photocatalytic performances. In this work, first time we report d eep eutectic solvents (DESs) assisted synthesis of flower structured BiOCl/BiVO 4 (BOC/BVO) with g-C 3 N 4 (BOC/BVO/g-CN) ternary heterojunction composites were successfully prepared using a simple wet-chemical method as a good acidic and alkaline oxygen evolution reaction (OER) catalysts. The OER activity showed on BOC/BVO/g-CN-15 achieved an enhanced photocatalytic activity with overpotential of 570 mV in 1M H 2 SO 4 and 220 mV in 1M KOH electrolyte at the current density of 10 mA cm -2 with excellent stability and extraordinary durability of the catalysts. The ternary heterojunctions reveal the extended lifetime of photogenerated charges and enhanced the separation efficiency of photogenerated electron-hole pairs, which is helpful to enhance the photocatalytic OER. Furthermore, we demonstrate the photocatalytic active performance of ternary heterojunctions in aqueous solution by using the photocatalytic dye degradation of methyl orange (MO) as a model pollutant displays a 95% degradation of 20 ppm of MO in 210 minutes under the irradiation of a 35 W Xe arc lamp. This works not only provides new insight into the design of catalysts using green solvents method, but also the design of highly efficient metal-free OER photocatalysts for applications in acidic and alkaline media.