Electrochemical and Photoelectrochemical Detection of Hydrogen Peroxide Using Cu₂O/Cu Nanowires Decorated with TiO_2−x Deriving from MXenes

Abstract

H 2 O 2 is a major transmitter of redox signals in electrochemical processes, whose detection is relevant for various industries. Herein, we developed a new fabrication method for a Cu 2 O/Cu nanowire-based nonenzymatic H 2 O 2 electrochemical sensor that was decorated with irregular TiO 2−x nanoparticles deriving form Ti 3 C 2 MXene. The TiO 2−x /Cu 2 O/Cu-NW electrodes possess excellent selectivity, stability, and reproducibility for H 2 O 2 detection in both EC and PEC operational modes. In the EC detection of H 2 O 2 , the TiO 2−x /Cu 2 O/Cu-NW electrode shows a linear relationship in the range from 10 μM to 42.19 mM and a low detection limit of 0.79 μM (S/N = 3), which has a similar sensitivity but a much broader linear range compared with the commercial H 2 O 2 analyzer (0−5.88 mM, Q45H/84, US-QContums). It also shows excellent recovery in detecting H 2 O 2 in the real orange juice and milk samples with the recovery ranging from 96.9 to 105%, indicating the potential for practical applications. In the PEC detection of H 2 O 2 , the TiO 2−x /Cu 2 O/Cu-NW electrode shows a lower detection limit of 59 nM (S/N = 3), which is 13 times more sensitive than the EC electrode. The enhanced PEC performance can be attributed to the formation of p−n heterojunction between TiO 2−x and Cu 2 O, which improves light utilization and inhibits the recombination of photo-induced electrons and holes. This work illuminates the extraordinary potential of MXene-derived TiO 2 in electrochemical and photoelectrochemical applications.

The in situ decoration of Ti3C2 quantum dots on Cu nanowires for highly efficient electrocatalytic reduction of nitric oxide to ammonia

“…41 However, the presence of Ti 3 C 2 QDs can be confirmed from the HRTEM image of Ti 3 C 2 QDs/Cu NWs as shown in Fig. 1D, which shows the distance of the lattice fringes to be 0.26 nm 42 corresponding to the Ti 3 C 2 QDs (0110) plane, and a distance of 0.198 nm 43 corresponding to the Cu (111) plane. The SEM image of Ti 3 C 2 QDs/Cu NWs shown in Fig.…”

UiO-66-Derived PBA Composite as Multifunctional Electrochemical Non-Enzymatic Sensor Realizing High-Performance Detection of Hydrogen Peroxide and Glucose

“…Herein, several anti-interference substances were selected based on the consideration of components in real body blood, including NaCl, uric acid (UA), dopamine (DA), ascorbic acid (AA), and lactic acid. In order to maintain consistency with previous reports, the concentration ratio of H 2 O 2 and interferents with 10:1 was adopted for the anti-interference test. − Herein, 50 μM H 2 O 2 , 5 μM NaCl, 5 μM UA, 5 μM lactate, 5 μM AA, and 5 μM DA were added sequentially to a 0.1 M NaOH solution at 0.65 V. As illustrated in Figure c that there was a significant current response with the addition of H 2 O 2 , yet the negligible current response to NaCl, UA, lactic acid, AA, and DA, which indicated that PBA/UiO-66/NF had excellent selectivity to H 2 O 2 . Similarly, the reproducibility of the PBA/UiO-66/NF electrode was also assessed.…”

Graphene Oxide Covered WO3 Nanosheet Arrays as Photoelectrode for Photoelectrochemical Detection of Trace H2O2

“…Trace level detection of H 2 O 2 is crucial in the food industry, life science, domestic settings, etc. , Because H 2 O 2 is readily converted to strong oxidizing species, such as hydroxyl free radicals ( • OH), superoxide radical (O 2 – •), singlet oxygen, etc., which may promote the aging of the cell, induce the oxidation of lipids and proteins, damage the structure of the DNA, and so on. − Although various techniques have so far been developed to identify and monitor H 2 O 2 , including colorimetric analysis, , fluorescence analysis, , electrochemical analysis, , etc., the cost, stability, and sensitivity obtained by these tactics are poor and lower minimum detection limit of H 2 O 2 is relatively high . Therefore, seeking suitable strategies to achieve the cost efficiency and detection accuracy of trace H 2 O 2 is of tremendous urgency but is a great challenge in the modern chemical industry.…”