Hydrazine High-Performance Oxidation and Sensing Using a Copper Oxide Nanosheet Electrocatalyst Prepared via a Foam-Surfactant Dual Template

Abstract

This work demonstrates hydrazine electro-oxidation and sensing using an ultrathin copper oxide nanosheet (CuO-NS) architecture prepared via a versatile foam-surfactant dual template (FSDT) approach. CuO-NS was synthesised by chemical deposition of the hexagonal surfactant Brij®58 liquid crystal template containing dissolved copper ions using hydrogen foam that was concurrently generated by a sodium borohydride reducing agent. The physical characterisations of the CuO-NS showed the formation of a two-dimensional (2D) ultrathin nanosheet architecture of crystalline CuO with a specific surface area of ~36 m2/g. The electrochemical CuO-NS oxidation and sensing performance for hydrazine oxidation revealed that the CuO nanosheets had a superior oxidation performance compared with bare-CuO, and the reported state-of-the-art catalysts had a high hydrazine sensitivity of 1.47 mA/cm2 mM, a low detection limit of 15 μM (S/N = 3), and a linear concentration range of up to 45 mM. Moreover, CuO-NS shows considerable potential for the practical use of hydrazine detection in tap and bottled water samples with a good recovery achieved. Furthermore, the foam-surfactant dual template (FSDT) one-pot synthesis approach could be used to produce a wide range of nanomaterials with various compositions and nanoarchitectures at ambient conditions for boosting the electrochemical catalytic reactions.

Supercapacitance Performance of Mesoporous Mono- and Bi-Metallic Cobalt and Nickel Hydroxides Nanoflakes Chemically Deposited from Foam-Surfactant Liquid Crystal Dual Templates

“…Chemicals and materials.-The chemical of non-ionic surfactant (Brij ® 78; polyoxyethylene (23) >99%] were supplied by BDH. The deionized (DI) water with a resistivity of less than 18.2 MΩ cm was obtained from (Milli-Q, Millipore, Inc.) and used to prepare all stock solutions.…”

“…Recently our research group developed a synthesis approach of foam-surfactant dual templates (FSDT) at ambient temperature to prepare a range of transition metal hydroxides mesoporous nanoarchitectures for the application of enhancing the methanol, 20 urea, 21 glucose 22 and hydrazine 23 oxidation reactions. The obtained mesoporous metal/hydroxide nanoarchitectures revealed more than a 10-fold enhancement of electrocatalytic activity towards small hydrocarbon molecules oxidation that is attributed to the presence of highly electroactive surface area and internally connected mesoporous network.…”

Electrochemical sensor based on PVP coated cobalt ferrite/graphite/PANI nanocomposite for the detection of hydrazine

“…The detection limit of the electrochemical sensor based on CF/G/PANI has been estimated to be 2.24 μM using the formula, LOD = 3S b /S where S b is the standard deviation and S is the slope of the calibration plot [20]. The applied potential was + 0.22 V. Successive addition of 1 μM to 100 μM hydrazine at regular interval shows fluctuations of current drift as the hydrazine concentration which is sufficient for the sensing [21][22][23].…”

Fabrication of a highly sensitive ultrathin nanosheet-like CuO nanostructure-based non-enzymatic electrochemical sensor for hydrazine detection

“…Recently, CuO nanostructures have been utilized in the fabrication of electrochemical-based hydrazine sensors. [33][34][35][36][37][38] For example, the Almutairi group synthesized ultrathin CuO nanosheets using a foam-surfactant dual template-based method and utilized it for hydrazine sensing and achieved a high sensitivity of 1.47 mA mM À1 cm À2 . 33 Khan et al used alumina-supported CuO nanoparticles as electrocatalysts that displayed excellent activity for hydrazine oxidation in an alkaline buffer.…”

“…[33][34][35][36][37][38] For example, the Almutairi group synthesized ultrathin CuO nanosheets using a foam-surfactant dual template-based method and utilized it for hydrazine sensing and achieved a high sensitivity of 1.47 mA mM À1 cm À2 . 33 Khan et al used alumina-supported CuO nanoparticles as electrocatalysts that displayed excellent activity for hydrazine oxidation in an alkaline buffer. 34 Lu et al constructed a sensor using MOF-derived nano-CuO for hydrazine sensing.…”