Fabrication of Nano Flower‐shaped Platinum on Glassy Carbon Electrode as a Sensitive Sensor for Lead Electrochemical Analysis

Abstract

Platinum nanoflowers modified glassy carbon electrodes (PtNFs/GCE) was fabricated simply for lead determination in water samples. The modified electrodes were prepared by electrodeposition in hexachloroplatinic acid solution at constant potential. The influence of deposition time and potential on surface morphology, chemical composition, electrochemical properties of electrode were investigated. At À 0.2 V of potential and 150 s of deposition duration, platinum developed as nanoflower shape and scattered densely all over the glassy carbon surface, producing the largest electrochemically active surface areas. The highest differential pulse stripping voltammetry (DPSV) signal of lead was obtained by using the prepared electrode. Under optimized experimental condition of electrolyte, accumulation potential and time, the peak current was found to be linear proportion to lead concentration in range of 1 to 100 μg L À 1 (slope = 0.371) with a limit of detection of 0.398 μg L À 1 . The method has good repeatability and reproducibility with relative standard deviations of 1.47 % and 4.83 %, respectively. The modified PtNFs/GCE also demonstrated an excellent long-term stability with only 9 % decrease in Pb peak current over 30 days. Moreover, the performance of the modified PtNFs/GCE in determination of Pb(II) in two industrial wastewaters was good agreement with data obtained by a graphite furnace atomic absorption spectrometry (GFAAS) method.

Relation of the electrochemical interplay between H2PtCl6 and H2O/H3O+/H2+ and the hydrogen‐evolution reaction

“…[41] Electrodeposited polycrystalline platinum on a glassy carbon surface does not, however, display (110) and (100) crystalline facets and it is in fact the (111) facet that dominates. [42] This is also the case on our platinum surface, electrodeposited onto a glassy carbon support, having been obtained through potential cycling (see Figure 5). The remainder of the peaks (not labeled) in the diffractogram are those of carbon.…”

A home-made nanoporous gold microsensor for lead(ii) detection in seawater with high sensitivity and anti-interference properties

“…Mercury, bismuth, antimony, tin, and indium-based metal film electrodes have also been used for trace metal detection, 17–21 but the lower chemical stability of such electrodes under atmospheric conditions limits their applications, despite the high sensitivity. Recently, rod-like poly tyrosine/Bi, 22 vertically aligned two-dimensional MoS 2 nanofilms, 23 flower-like MoS 2 /rGo composites, 24 amino-functionalized attapulgite, 25 and flower-shaped Pt modified electrodes 26 have allowed sensitive detection of Pb. Moreover, calixarene/SPCE, 27 exfoliated graphite oxide, 28 carbon nanotubes-benzo-18-crown composites, 29 cyclodextrins, 30 and poly-xylenol orange-modified electrodes 31 have been reported for selective detection of Pb.…”

Sensitive Electrochemical Detection of Pb(II) and H2O2 via a Dual‐functional Sn‐doped Defective Bi2S3 Microspheres

“…While hydrogen peroxide (H 2 O 2 ), as one of the representative reactive oxygen species (ROS), plays a critical role for aging and disease in physiological process [8, 9]. So far, a series of excellent results have been achieved on the separately electrochemical detection of heavy metal ions (Pb(II)) and biological molecules (H 2 O 2 ) [10, 11]. However, in order to extend the practicability of electrochemical techniques, it would be greatly important and meaningful to explore a dual‐functional electrochemical sensor that applied in environmental monitoring and medical diagnosis.…”