Au@Pd core–shell nanoparticles-decorated reduced graphene oxide: a highly sensitive and selective platform for electrochemical detection of hydrazine

Abstract

Tailored fabrication of noble metal based bimetallic nanoparticles decorated reduced graphene oxide (rGO) is highly demanding for their use as a clean, recyclable substrate for electrochemical performances. Here, we have successfully prepared Au core @Pd shell with an average size of ~11.5 nm on rGO support (denoted as GAP) through a surfactant-free, one step synthetic protocol. Use of 2-propanol as a solvent as well as reducing agent for the precursors demonstrates the designed process is economically preferable for scalable synthesis of the desired GAP material. Comparative electrocatalytic efficiency in term of hydrazine (N 2 H 4 ) oxidation discloses the optimized noble metals loading on rGO nanosheets and also the composition to capitalize maximum advantage from the as-synthesized GAP material. Then the most effective electrocatalyst GAP3 with optimized constituents was applied as a substrate to determine N 2 H 4 electrochemically down to a trace concentration level with high selectivity and sensitivity. The limit of detection (LOD) from GAP3 is calculated to be 0.08 µM with a linear range of 2−40 µM from the chronoamperometric (CA) result at -0.15 V vs. SCE. The novelty of N 2 H 4 detection by the designed substrate becomes

Au−Pd Selectivity‐switchable Alcohol‐oxidation Catalyst: Controlling the Duality of the Mechanism using a Multivariate Approach

“…One may notice that any slight shift on the binding energy can be related to the chemical environment since a bimetallic system was under consideration [35] and, although not observed, a minor contribution from Pd 2 + cannot be rejected. [36] The binding energy of 134.8 eV for Sr 3d 1/2 ( Figure 2D) corresponds to SrCO 3 , while the other two binding energies are attributed to SrÀ O bonds (Sr d 3/2 , 132.5 eV; Sr d 3/2 , 134.0 eV). [37] The O 1s peaks tend to be broad due to overlapping of components ( Figure 2E).…”

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).…”

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

“…Many efforts have been made in developing appropriate catalytic materials to increase the electrochemical performances. Noble metal materials (such as platinum (Pt) [23], gold (Au) [24,25] and silver (Ag) [26,27]) are commonly used to modify electrodes for the detection of H 2 O 2 and N 2 H 4 because of their extraordinary catalytic activities. Of note, the relatively high cost and resource scarcity still limit their practical applications.…”