Search

A promising electrochemical sensor, Pt nanoparticles decorated on the surface of reduced graphene oxide (RGO) sheets were facilely synthesized by a one-pot hydrothermal method. The morphology and composition of as-prepared Pt–RGO composites have been characterized by transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and X-ray diffraction (XRD). It is found that Pt nanoparticles with ca. 4.81 ± 1.54 nm in diameter were evenly distributed on the surface of RGO sheets. The cyclic voltammetry shows that Pt–RGO nanocomposite has a higher electron transfer rate and remarkable increase electrochemical activity toward the oxidation of nitrite. The amperometry reveals that the Pt–RGO modified electrode exists a good linear relationship between peak current and concentration of nitrite with a low detection limit of 0.1 μM and high sensitivity of 496.4 μA mM −1 . Moreover, the as-synthesized Pt–RGO electrode display a fast amperometric response within 4 s. Compared to the bare Pt nanoparticles or the RGO modified glassy carbon (GC) electrode, the as-synthesized Pt–RGO nanocomposite shows a well reproducibility, stability and anti-interference electrocatalytic performance toward nitrite sensing. [ABSTRACT FROM AUTHOR]

A facile electrochemical approach to synthesize reduced graphene oxide (RGO) modified glassy carbon (GC) electrode as an excellent support for anchoring PtCuAu nanoparticles is reported. The as-prepared PtCuAu/RGO catalyst has been characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and electrochemical methods. It is found that the PtCuAu nanoparticles formed alloy structures and are evenly distributed on the RGO substrate. Compared with Pt/RGO, PtCu/RGO, PtAu/RGO and CuAu/RGO electrodes, the PtCuAu/RGO catalyst exhibits distinctly enhanced current density and nice stability toward formic acid electrooxidation. The experimental results indicate that the prepared PtCuAu/RGO catalyst has enormous potential applications in direct formic acid fuel cells (DFAFC). [ABSTRACT FROM AUTHOR]

Highlights: [•] The f-RGO/GCE was fabricated by electrochemical method. [•] The flower-like graphene framework has a well-defined distributed on GCE. [•] The f-RGO/GCE shows good responsiveness and high selectivity for DA detection. [ABSTRACT FROM AUTHOR]

Highlights: [•] The Pt–RuNPs/RGO/CCE was fabricated by electrochemical method. [•] Pt–Ru nanoparticles deposited on RGO appear to be well-dispersed. [•] The Pt–RuNPs/RGO/CCE shows high catalytic activity for methanol electrooxidation. [ABSTRACT FROM AUTHOR]

Abstract: A facile and cost effective approach has been developed towards electrochemical fabrication of graphene-modified carbon fiber electrode (GE/CFE) to determine the content of uric acid (UA) via cyclic voltammetry (CV) and potentiostatic (i–t) methods. The combined merits of GE and CFE endow the electrode with large specific surface area and high electrical conductivity. The advantage of thus obtained GE/CFE for UA detection is supported by its higher peak current intensity and lower oxidation potential compared with those of bare glassy carbon electrode (GCE), bare carbon fiber electrode (CFE), and graphene-modified glassy carbon electrode (GE/GCE). Further amperometric study gives a wide liner range from 0.194μM to 49.68μM and a low detection limit of 0.132 μM (S/N =3) with fast response time for the determination of UA on GE/CFE. The determination of UA with GE/CFE is highly selective and reproducible, within a relative standard deviation of 2.8%. [Copyright &y& Elsevier]