Cobalt nanoparticles as sacrificial templates for the electrodeposition of palladium nanomaterials in an ionic liquid, and its application to electrochemical sensing of hydrazine

Abstract

We report on the electrodeposition of palladium nanomaterials in choline chloride-based ionic liquid ethaline. A glassy carbon electrode (GCE) was modified with cobalt nanoparticles (acting as sacrificial templates) and a GCE modified with palladium nanoparticles (PdNPs) were fabricated and used to study the electrocatalytic oxidation of hydrazine (N 2 H 4 ). Scanning electron microscopy revealed that the PdNP modified GCE has a uniform morphology. Zero current potentiometry was used for in-situ probing the changes in interfacial potential of the oxidation of hydrazine. An amperometric study showed that the PdNP modified GCE possesses excellent electrocatalytic activity towards N 2 H 4 . The modified electrode displays a fast response (<2 s), high sensitivity (74.9 μA m(mol L −1 ) −1 cm −2 ) and broad linearity in the range from 0.1 to 800 μmol L −1 with a detection limit of 0.03 μmol L −1 (S/N03).

Highly Sensitive Hydrazine Sensor Based on Co(OH)2 Nanoflakes Electrochemically Deposited on MWCNTs

“…In order to detect the hydrazine through electrochemical methods, many nanomaterials modified glassy carbon electrodes have been fabricated due to their high surface to volume ratio, good catalytic activity and high sensitivity. Remarkably, noble metal nanoparticles such as silver (Ag) , gold (Au) , platinum (Pt) and palladium (Pd) nanomaterials have been used in recent years. Although, noble metal nanoparticles modified electrodes have tendency to decrease the over potential and increase the faradaic current of hydrazine, the commercialization of those expensive noble metal nanoparticles is limited.…”

A low-cost and label-free assay for hydrazine using MnO2 nanosheets as colorimetric probes

“…A c c e p t e d M a n u s c r i p t 5 In order to address the above-mentioned problems, we report a novel, low-cost, and label-free assay for hydrazine using MnO 2 nanosheets as colorimetric probes for the first time. The related chemical reaction of this assay can be accomplished within 1 min.…”

“…Up to now, several methods have been developed for the detection of hydrazine, including chromatography, electrochemistry, chemiluminescence, titrimetry, and colorimetry [4][5][6]. Among these techniques, colorimetric methods are particularly attractive due to their advantages in terms of simplicity, rapidity, reliability, and no requirement of any sophisticated instrumentation.…”

Using AuCo alloy nanoparticles/HS-graphene modified electrode for the selective determination of dopamine, ascorbic acid and uric acid

“…Compared with their monometallic counterparts, they oen exhibit enhanced performances because of the bifunctional effect and the electronic effect, such as a high catalytic activity, good stability, magnetic property and corrosion resistance. [1][2][3][4][5][6][7] Among these properties, the catalytic activity is especially noticeable, and some bimetallic NPs, such as AuPt, [8][9][10][11] AuAg, [12][13][14] AuPd, 15,16 PtPd, 17,18 PtAg, 19,20 CoPd, 21 AgCu, 22 and AuCo, [23][24][25] have been applied in electrochemical research for catalyzing biomolecules with good selectivity and sensitivity. 26 In this work, the cauliower-like AuCo NPs were synthesized via an electro-deposition method and was incorporated with thiol group functional graphene (HS-GR) for the selective determination of dopamine (DA), ascorbic acid (AA) and uric acid (UA).…”