Non-Enzymatic Amperometric Sensing of Hydrogen Peroxide Based on Vanadium Pentoxide Nanostructures

Abstract

Herein, a simple and selective electrochemical sensor was proposed for non-enzymatic determination of hydrogen peroxide (H 2 O 2 ). This sensor was fabricated by incorporation of the novel nanostructured orthorhombic vanadium pentoxide (V 2 O 5 ) into the carbon paste electrode (CPE) which provides significant catalytic activities for H 2 O 2 reduction. The electrochemical impedance spectroscopy (EIS) studies illustrated lower charge transfer resistance (R ct ) of the V 2 O 5 modified CPE compared to the unmodified CPE. The effects of various experimental factors such as solution pH, applied potential and amount of modifier were studied in an amperometric mode. After optimization, the proposed method displayed a wide linear detection range from 5.0 to 1400.0 μM with a low detection limit of 2.5 μM based S/N = 3 and a response time less than 5 s. The sensitivity of 3.44 μA μM −1 cm −2 was acquired in the present method for H 2 O 2 quantification is considerably better than other reported amperometric sensors with similar detection limits. In addition, the designed sensor depicted good reproducibility, remarkable selectivity, and excellent stability. The modified CPE was applicable for analysis of H 2 O 2 in some cosmetic and personal care products.

Orange Peel Derived‐Nitrogen and Sulfur Co‐doped Carbon Dots: a Nano‐booster for Enhancing ORR Electrocatalytic Performance of 3D Graphene Networks

“…It is proven that the function of the modified electrode primarily relies on the modifier characteristics employed in the modification procedure [67][68][69][70][71][72][73][74][75][76]. One of the vigorous candidates as electrode modifier for utilizing in ORR is graphene emerged as a peculiar class of two dimensional (2D) carbon materials thanks to its unique physicochemical features [3,77].…”

Structure and Photoluminescence Properties of Thermally Synthesized V2O5 and Al-Doped V2O5 Nanostructures

“…The above doped V 2 O 5 materials possess potential applications in light emitters, photocatalysts, and cathodic materials for ionic batteries. Owing to the layered structures and tunable photoluminescence properties, V 2 O 5 has many applications, including electrochromic devices [ 17 ], solar cells [ 18 , 19 ], catalysts [ 20 ], solid-state batteries [ 21 ], gas sensors [ 22 ], chemical species sensors [ 23 ], smart windows [ 4 ], etc. The dopants as mentioned above were not metallic powders.…”

Preparation of Graphene Oxide-Embedded Hydrogel as a Novel Sensor Platform for Antioxidant Activity Evaluation of Scutellaria baicalensis

“…On the other hand, electrochemical methods have attracted a lot of attention because of their rapidity and efficiency (Kilmartin, 2001;Blasco et al, 2007;Teixeira et al, 2013;Apak et al, 2016). The non-radical electrochemical methods include cyclic voltammetry, enzyme voltammetry, and potentiometric analysis (Ghanei-Motlagh et al, 2019;Ghanei-Motlagh and Baghayeri, 2020;Naderi Asrami et al, 2020;Karimi-Maleh et al, 2021c;Nodehi et al, 2021). Electrode poisoning is the reduction of efficiency on the electrode surface due to the deposition of reactants (Karimi-Maleh et al, 2020).…”