Amperometric Non-Enzymatic Hydrogen Peroxide Sensor Based on Aligned Zinc Oxide Nanorods

Abstract

Zinc oxide (ZnO) nanorods (NRs) have been synthesized via the hydrothermal process. The NRs were grown over a conductive glass substrate. A non-enzymatic electrochemical sensor for hydrogen peroxide (H 2 O 2 ), based on the prepared ZnO NRs, was examined through the use of current-voltage measurements. The measured currents, as a function of H 2 O 2 concentrations ranging from 10 µM to 700 µM, revealed two distinct behaviours and good performance, with a lower detection limit (LOD) of 42 µM for the low range of H 2 O 2 concentrations (first region), and a LOD of 143.5 µM for the higher range of H 2 O 2 concentrations (second region). The prepared ZnO NRs show excellent electrocatalytic activity. This enables a measurable and stable output current. The results were correlated with the oxidation process of the H 2 O 2 and revealed a good performance for the ZnO NR non-enzymatic H 2 O 2 sensor.

Electrochemical Hydrogen Peroxide Sensor Based on Macroporous Silicon

“…It is known that the oxygen molecules [ 34 , 35 ] dissolved in water are adsorbed (chemisorbed) on the MPS active sites; consequently, it converts to active oxygen ions with the capture of electrons from the surface of MPS. This can be understood through the following reactions [ 31 , 35 ]: …”

“…Previously, we reported on the application of zinc oxide (ZnO) nanorods for H 2 O 2 detection [ 31 ], the prepared ZnO nanorods showed a linear response in the range of 10 μM to 700 μM with a sensitivity of 295 nA μM –1 ∙cm –2 . The low-range response may be due to the degradability of ZnO once it is in contact with the analyte [ 32 , 33 ], or to the limit in the active sites.…”

Rational design of ZnO@ZIF-8 nanoarrays for improved electrochemical detection of H2O2

“…The prepared sensor has a linear range of 10–700 μM and a lower detection limit of 42 μM. 13 In addition, Li et al prepared Au–ZnO composite nanofibers by electrospinning as the electrode material of the H 2 O 2 sensor, which has a good linear relationship and sensitivity in the range of 1–6000 μM, and a lower detection limit of 0.1 μM. 14 Although the proposed H 2 O 2 sensor based on the ZnO nanostructure has a wide linear range and a low detection limit, due to the inevitable agglomeration of ZnO used as a sensing material, the specific surface area and active center of the nanomaterial are reduced, thus reducing the service life and stability of the sensor.…”

H2O2 biosensor consisted of hemoglobin-DNA conjugate on nanoporous gold thin film electrode with electrochemical signal enhancement

“…As a main by-product of enzymatic reactions, concentration of H 2 O 2 is considered as a parameter for activity coefficient of physiological reactions [11]. Consequently, various types of biosensors have been developed to detect H 2 O 2 [12, 13]. Kauffmann’s group developed the H 2 O 2 biosensor using enzyme horseradish peroxidase (HRP) entrapped in a polypyrrole electrode [14].…”