Solar-driven seawater production H2O2 catalyzed by hydroxyl functionalized crystalline K-doped g-C3N4 under ambient conditions

Three hydroxyl functionalized crystalline K-doped g-C3N4 were synthesized from dicyandiamide, melamine, ammonium chloride, ammonium oxalate, and ammonium citrate via ionothermal polycondensation using KCl as molten salt under N-2 atmosphere, which served as efficient recyclable photocatalysis realized that generating H2O2 directly from seawater with air by 2e(-) ORR pathway under stimulated solar irradiation in ambient conditions. Under optimized conditions, the highest H2O2 production rate of 1622 mu mol g(-1) h(-1) for duration of 10 h was obtained. The cycling performances of HPCN-2 displayed reusable for five times without noticeably loss of its catalytic activity. This work presents a real safer, sustainable, and economical approach for production of H2O2 directly from abundant natural seawater.

Automated summary

In this study, three hydroxyl functionalized crystalline K-doped g-C3N4 materials were synthesized via ionothermal polycondensation. These materials can directly generate H2O2 from seawater under ambient conditions and exhibit efficient recyclability.