Search

In situ reduction of AgI to Ag nanoparticles (Ag NPs) supported on C-doped boron nitride (AgI/BN-C) was developed for CO 2 electroreduction to CO with a much enhanced faradaic efficiency (FE) of 99.5 % and a high current density of 56.3 mA cm−2. The enhanced performance is mainly attributed to the controllable construction of Ag0-Ag+ sites, which effectively provides a large number of active sites, enhances the adsorption strength of the intermediate and accelerates the reaction kinetics. [ABSTRACT FROM AUTHOR]

Highlights: [•] A novel cholesterol biosensor was constructed based on ChOx-IL-capped-AuNPs/GCE. [•] IL-capped-AuNPs was synthesized using two-phase synthesis and employed as a conducting matrix to immobilize ChOx. [•] Direct electrochemistry of ChOx on the electrode was obtained. [•] The ChOx-IL-capped-AuNPs/GCE exhibit remarkable performance for cholesterol detection. [ABSTRACT FROM AUTHOR]

Highlights: [•] A novel nonenzymatic H2O2 sensor was constructed on AgNPs/MWCNTs-IL modified GCE. [•] Ionic liquid functionalized carbon nanotube was used as matrices for deposition of AgNPs effectively. [•] AgNPs were uniformly and less agglomerate formed on the MWCNTs-IL film. [•] AgNPs/MWCNTs-IL/GCE displayed good electrocatalytic activity to the reduction of H2O2 and applied to real samples. [•] The electrocatalytic mechanism of the constructed sensor was proposed. [ABSTRACT FROM AUTHOR]

Abstract: A novel cholesterol biosensor was fabricated on hydrophobic ionic liquid (IL)/aqueous solution interface. The hydrophobic IL thin film played a signal amplification role because it not only enriched the cholesterol from the aqueous solution, but also immobilized matrix for cholesterol oxidase (ChOx). Prussian blue (PB) as advanced sensing materials was used as effective low-potential electron transfer mediation toward hydrogen peroxide (H2O2). The fabricated IL-ChOx/PB/Glassy carbon electrode (GCE) was characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammogram (CV), respectively. And it exhibited a linear response to cholesterol in the range of 0.01–0.40mM with a detection limit of 4.4μM. In addition, the kinetics behavior of cholesterol at IL-Chox/PB/GCE electrode was examined, and the electrocatalytic mechanism was proposed as shown in first scheme. ChOx immobilized in hydrophobic IL thin film was used as the first electrocatalyst for the cholesterol into H2O2, and the PB film onto the GCE was used as the second electrocatalyst for the 2e− reduction of the produced H2O2 into H2O. [Copyright &y& Elsevier]

Abstract: The combination of biomolecules-functionalized multiwalled carbon nanotube (MWNTs) and ionic liquid (IL) yields nanostructured biointerfaces, formed a novel kind of structurally uniform and bioelectrocatalytic activity material. Rutin was chosen as a model biomolecules to investigate the composite system. The MWNTs–Rutin–IL composite film was characterized by different methods including thermogravimetric analysis (TGA), UV–vis spectra, electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscope (SECM). A pair of well-defined quasi reversible redox peaks of rutin was obtained at the MWNTs–Rutin–IL composite film modified glassy carbon electrode (GCE) by direct electron transfer between the rutin and the GCE electrode. Dramatically enhanced biocatalytic and electrocatalytic activity was exemplified at the MWNTs–Rutin–IL/GCE electrode by the oxidized of tryptophane. The oxidation peak currents of tryptophane in such modified electrode increased linearly with the concentrations of tryptophane in the range from 8×10−8 to 2×10−5 molL−1 with a detection limit of 3.0×10−8 molL−1. The unique composite material based on biomolecules-functionalized carbon nanotube and ionic liquid have wide potential applications in direct electrochemistry, biosensors, and biocatalysis. [Copyright &y& Elsevier]