Anti-biofouling photothermal film for solar steam generation based on oxygen defects rich and haloperoxidase mimic active V6O13

As a promising sea water desalination technique, solar evaporation has attracted massive attention. But in solar steam generation system, the photothermal film often becomes invalid because of bio-fouling. Haloperoxidase is an ideal choice to reverse this situation, which can catalyze conversion from Br - to HBrO and prevent adhesion of microorganism directly. Herein, oxygen defect rich V 6 O 13 with high photothermal conversion efficiency and haloperoxidase mimic activity is synthesized. As confirmed by Density Function Theory calculations, oxygen defect can strengthen adsorption of V 6 O 13 towards H 2 O 2 and Br - , which enhances haloperoxidase mimic activity greatly. Oxygen defect rich V 6 O 13 also exhibits excellent photothermal conversion property. A photothermal film is fabricated from oxygen defect rich V 6 O 13 and polyacrylonitrile with electrospinning technique. Under 1 ​kW ​m −2 , its evaporation rate reaches 1.25 ​kg ​m −2 ​h −1 with efficiency of 85.3%. The concentrations of Na + , K + , Ca 2+ and Mg 2+ have satisfied the standard of drinking water. More importantly, haloperoxidase mimic activity endows the film perfect anti-biofouling ability and suitable for long time water evaporation in marine environment. It can be expected photothermal film with anti-biofouling ability will exhibits a promising prospect in seawater desalination and sewage treatment. Based on oxygen defects rich V 6 O 13 with high photothermal conversion efficiency and haloperoxidase mimic activity, anti-biofouling photothermal film is fabricated for solar steam generation. • Bi-functional V 6 O 13 is synthesized successfully with rich oxygen defects. • Oxygen defect improves haloperoxidase mimic activity of V 6 O 13 greatly. • V 6 O 13 membrane is used for solar steam generation due to photothermal effect. • Haloperoxidase mimic activity donates V 6 O 13 membrane anti-biofouling ability.