Spontaneous Deposition of Uniformly Distributed Ruthenium Nanoparticles on Graphitic Carbon Nitride for Quantifying Electrochemically Accumulated H2O2

Main observation and conclusion Highly dispersed ultrasmall ruthenium nanoparticles with a clean surface are deposited onto graphitic carbon nitride (C3N4-Ru) through spontaneous redox reaction between the C3N4 sheets and Ru salt without the use of any reductant. The as-prepared C3N4-Ru exhibits distinct peroxidase-like activity. A nanozyme based method is successfully developed for detecting the H2O2 generated in-situ by the two-electron oxygen reduction strategy. The C3N4-Ru nanozyme can realize the detection of H2O2 with a wide linear range and a low detection limit. The testing results are also compared with the conventional modified titration method, and show greater possibility for the practical detection of H2O2 produced via the electrochemical oxygen reduction for its higher selectivity.