p‐Nitrophenol (p−NP) is a high priority toxic pollutant and that has harmful effects on human, animals and plants. Thus, the detection and determination of p−NP present in the environment is an urgent as well as highly important requisite. The present article, therefore focused on the construction of a novel electrochemical sensor based on NiO nanoparticles/α‐cyclodextrin functionalized reduced graphene oxide modified glassy carbon electrode (NiO−NPs‐α‐CD‐rGO‐GCE) for the selective and sensitive detection of p−NP. UV‐vis, high resolution transmission electron microscopy (HR‐TEM), selected area electron diffraction pattern (SAED) and X‐ray diffraction (XRD) analysis confirms the formation of highly pure NiO nanoparticles. Field emission scanning electron microscopy (FE‐SEM), energy dispersive X‐ray spectroscopy (EDS), and cyclic voltammetry (CV) were used to characterize the step‐wise electrode modification process. DPV was carried out to quantify p−NP within the concentration range of 1−10 μM and found the detection limit of 0.12 nM on the basis of the signal‐to‐noise ratio S/N=3. The electrode can able to detect different isomers of nitrophenols. Interferences of other pollutants such as phenol, p‐aminophenol, o‐ and m‐ nitrophenol, 4‐chlorophenol, 2,6‐dichlorophenol and ions like K+, Cd2+, Cl−, SO42− did not affect the sensing of p−NP. The newly developed sensor exhibited diffusion controlled kinetics and had excellent sensitivity, selectivity and reproducibility for the detection of p−NP. The electrode showed good recoveries in real sample analysis.

Oxidation of water is the most crucial step in electrochemical water splitting and artificial photosynthesis. To ease the water oxidation process, the development of stable, robust, and efficient catalyst is...

Highly active, robust, cheap, and environmentally benign electrocatalysts for oxygen evolution reaction (OER) are critically important to develop a sustainable artificial energy cycle. Here, we report the in-situ synthesis of...

A magnetic nanomaterial based electrochemical sensor was developed by immobilizing Fe 3 O 4 nanoparticles (ca. 12 nm d.) on a pyridine molecule grafted glassy carbon electrode (Py-GCE) for the selective and sensitive determination of two important neurotransmitters, dopamine (DA) and epinephrine (EP) at neutral pH. The synthesised Fe 3 O 4 magnetic nanoparticleswere characterized by FTIR, UV-Vis, TEM, XRD and XPS methods, whereas thefabricated electrodeswere characterized by using SEM, ATR-FTIR, CV and EIS techniques. Differ-ential pulse voltammetry was used for the determination of DA and EP in the linear range of 0.2 to 1.2 μM with the detection limits (S/N = 3) of 0.34 nM and 0.61 nM, respectively. The sensor electrode exhibited high stability, reproducibility, good selectivity in the presence of potential interfering agents viz. ascorbic acid, uric acid, citric acid, glucose, etc. Theproposed method was successfully applied for the simultaneous determination of DA and EP in human blood sample and the recovery result was excellent.

Chlorophenols are considered priority pollutants and are harmful to humans and the environment; consequently, sensitive, and selective detection of chlorophenols is very significant. In the present article, a glassy carbon...