Increasing Graphene Selectivity for H₂O₂Electro-Production Using Phosphorus Doped Carbon Nitride Quantum Dots as Self-Antibiofouling Dissolved Oxygen Sensor

Dissolved oxygen (DO) is a crucial indicator of the aquatic environment. The electrochemical DO sensor is renowned for superior precision. However, the unfavorable biofilm growth on the electrode surface and affect its sensitivity. H 2 O 2 , generated from the 2e - pathway ORR, emerges as a potent for degrading the biofilm attached on the electrode surface. Developing electrocatalyst material for selective 2e - pathway ORR that is challenging, while most are work for 4e - pathway. Herein, we design P-CNQD attaching to functionalized graphene (P-CNQD/Gr) that possesses highly selective 2e - pathway ORR. Upon the combination, the P-CNQDs were successful in altering the H 2 O 2 selectivity, resulting in 85% H 2 O 2 selectivity inside neutral medium. The reliable electrocatalyst with outstanding sensitivity and self-antibiofouling performance to be employed in fish farming Figure 1