Visible-Light Driven Efficient Overall H2O2 Production on Modified Graphitic Carbon Nitride under Ambient Conditions

Abstract Solar-powered photocatalytic H2O2 production via simultaneous oxygen reduction and water oxidation under ambient conditions is intriguing but challenging to achieve both high oxygen reduction and water oxidation efficiencies. Herein, we report an elaborately modified carbon nitride photocatalyst presenting the highest catalytic efficiency (as high as 75 μM h-1) ever reported in ambient conditions without using any additives. The high oxygen reduction efficiency is achieved owing to the promoted adsorption and direct reduction of O2 on the defective sites of the catalyst, and the storage of electrons in redox molecules as a stable and selective medium for the relayed reduction of O2. Meanwhile, the photo-induced holes exhibit high oxidation potential (1.87 V vs NHE) capable of transforming water into H2O2 selectively, and even degrading organic pollutants as well. This work presents a potent example of producing H2O2 in a real sustainable and economical way.