An electrochemical synthesis strategy for composite based ZnO microspheres–Au nanoparticles on reduced graphene oxide for the sensitive detection of hydrazine in water samples

Abstract

An electrochemical synthesis strategy has been approached to prepare the novel composite viz.reduced graphene oxide nanosheets/ZnO microspheres (~0.6 µm)-Au nanoparticles (~50 nm) modified glassy carbon electrode (GCE/RGO/ZnO-Au) for the trace level detection of hydrazine. The as-prepared composite is characterized by using Scanning Electron Microscopy (SEM) along with Energy Dispersive X-ray (EDX) analysis confirm the presence of Au nanoparticles along with globular ZnO microspheres embedded over the entire surface of graphene nanosheets. The electrochemical detection of hydrazine is performed by using cyclic voltammetry and chronoamperometry methods. Fascinatingly, the oxidation peak current of hydrazine at RGO/ZnO-Au modified GCE is 4.1 fold higher than that of RGO-Au modified GCE and 2.4 fold higher than ZnO/Au-modified GCE along with favorable lower overpotential at 0.1 V. The chronoamperometric hydrazine sensor shows a very lower detection limit of 18 nM with higher sensitivity of 5.54 µA µM -1 cm -2 . The excellent analytical parameters of the RGO/ZnO-Au modified electrode over the various related modified electrodes suggests that the electrode can be widely used for the trace level detection of hydrazine for several industrial applications with low cost, ease of preparation, repeatability and long-term stability.

Facile synthesis of electrospinning Mn2O3-Fe2O3 loaded carbon fibers for electrocatalysis of hydrogen peroxide reduction and hydrazine oxidation

“…Therefore, developing a rapid, reliable and economical method for determination of H 2 [20] and so on. As expected, electrochemical analysis [21] has evolved as a viable alternative for N 2 H 4 detection by the advantages given above.…”

Recent Progress on Graphene-based Electrochemical Biosensors

“…Graphene‐based electrochemical sensors have also been employed to detect other analytes, such as gas (NO and NH 3 ), environmental pollutants (hydroquinone, catechol, methyl jasmonate, hydrazine, and mercury ions), pharmaceutical medicine (nimodipine, rutin, paracetamol, etc. ), industrial compounds (methanol and ethanol), explosives (TNT), and pesticides (triazophos).…”

Deriving Efficient Porous Heteroatom‐Doped Carbon Electrocatalysts for Hydrazine Oxidation from Transition Metal Ions‐Coordinated Casein

“…In particular, much attention has been given to fuel cells because they can generate electricity from chemicals derivable from various non‐fossil fuel sources (e.g., water) at the expense of wind, solar, geothermal energy, etc. Among many types of fuel cells, hydrazine (N 2 H 4 )‐powered fuel cells are notable because hydrazine has a relatively high theoretical energy output, is easy to transport/store as it is liquid at ambient conditions, and does not emit the greenhouse gas CO 2 when it is used as fuel . However, the hydrazine oxidation reaction (HzOR), which is used in these fuel cells, is kinetically slow and requires a high amount of electrical energy to take place.…”