Electrochemical and Photoelectrochemical Detection of Hydrogen Peroxide Using Cu2O/Cu Nanowires Decorated with TiO2−x Deriving from MXenes

• DOI: 10.1021/acsami.2c19531
• Publication Date: 2022-12-15T17:32:20Z
• Authors: Quan Li; Shufei Fu; Xing Wang; Liang Wang; Xin Liu; Yongsheng Gao; Qin Li; Wentai Wang
• Keywords: MXenes; Linear range

H2O2 is a major transmitter of redox signals in electrochemical processes, whose detection relevant for various industries. Herein, we developed new fabrication method Cu2O/Cu nanowire-based nonenzymatic sensor that was decorated with irregular TiO2-x nanoparticles deriving form Ti3C2 MXene. The TiO2-x/Cu2O/Cu-NW electrodes possess excellent selectivity, stability, and reproducibility both EC PEC operational modes. In the H2O2, electrode shows linear relationship range from 10 μM to 42.19 mM low limit 0.79 (S/N = 3), which has similar sensitivity but much broader compared commercial analyzer (0-5.88 mM, Q45H/84, US-QContums). It also recovery detecting real orange juice milk samples ranging 96.9 105%, indicating potential practical applications. lower 59 nM 13 times more sensitive than electrode. enhanced performance can be attributed formation p-n heterojunction between Cu2O, improves light utilization inhibits recombination photo-induced electrons holes. This work illuminates extraordinary MXene-derived TiO2 photoelectrochemical