Multi-Tailoring of a Modified MOF-Derived CuxO Electrochemical Transducer for Enhanced Hydrogen Peroxide Sensing

Reasonable control of the redox states within the catalytic units together with the interconnection degrees of the substrate is of great significance in the modulation of a well-performed transducer. Herein, a novel carbon black (CB)-modified copper metal-organic framework nanomaterial (CB@Cu-MOF) prepared at room temperature was utilized as the precursor to synthesize its deriving mixed-valent copper-oxide composite catalysts (NC/CuxO-T). Via tuning the carbonization process of the precursor at different temperatures (T=100 ℃, 200 ℃, 300 ℃ and 400 ℃), the different ratio configurations of the redox-alternated CuxO portions were successfully controlled, simultaneously with the effective tailoring of defect aboundance in the N-doped carbon substrate. As a result, an optimized NC/CuxO-300 electrochemical H2O2 sensor was able to present a low detection limit (0.26 uM) and decent linear ranges (0.02-1.79 mM and 2.29-9.29 mM). Our strategy using easily available initial materials with mild preparation condition was expected to promote the practical application of the star materials out from laboratories.