All-in-one photocatalysis device for one-step high concentration H2O2 photoproduction

Achieving multi-functions integrating reaction, separation and concentration into one-step catalysis process is a great challenge. Photocatalytic H 2 O 2 generation is the cleanest and cheapest way for its production. Herein, an all-in-one photocatalytic device for H 2 O 2 generation was designed by catalysis layer with ZIF-8/C 3 N 4 composite and carbon dots-based evaporation layer (CDE). With this device, H 2 O 2 solution with high concentration is obtained, and no need for extra separation and concentration processes. Under 2 sun illumination (3 h), H 2 O 2 evolution reaches 17.13 μmol and H 2 O 2 solution concentration gets to 10.15 mmol L −1 . Mole fraction of H 2 O 2 solution obtained by all-in-one device is 1.86 times more concentrated than that of not concentrated H 2 O 2 solution. Besides, multiples devices can work concurrently to realize large-scale production and gain large amounts of H 2 O 2 solution with high concentration. Moreover, all-in-one devices can be reused at least ten cycles. The relation between the structure and performance of the photocatalysis device is further studied by COMSOL Multiphysics software and mathematical analysis. All-in-one photocatalytic device promotes H 2 O 2 photoproduction closer to the practical application due to realizing continuous production of amounts of aqueous solution of H 2 O 2 with high concentration in one-step.