Renewable New Copper Complex Bulk‐Modified Carbon Paste Electrode: Preparation, Electrochemistry, and Electrocatalysis

Abstract

A conductive carbon paste electrode (CPE) comprised of a new copper-complex of [Cu 2 (Dpq) quinoxaline, Ac ¼ acetate) and carbon powder, was fabricated by the direct mixing method. The electrochemical behavior and electrocatalysis of the new copper-complex modified CPE (Cu-CPE) have been studied in detail. Cyclic voltammograms showed that the Cu-CPE had a favorable electrochemical response of a reversible redox couple of Cu(II)/Cu(I). The Cu-CPE showed good electrocatalytic activity toward the reduction of the bromate, nitrite and hydrogen peroxide. The electrocatalytic reduction peak current of KBrO 3 , KNO 2 and H 2 O 2 showed a linear dependent on their concentrations. All of the results revealed that the Cu-CPE had a good reproducibility, remarkable long term stability and especially good surface renewability by simple mechanical polishing in the event of surface fouling, which is important for practical application.

Syntheses, Structures and Electrochemical Properties of Two New Copper(II) Complexes Based on Isomeric Bis(pyridylformyl)piperazine Ligands and Rigid=Flexible Organic Dicarboxylates

“…As shown in Fig. 8, the cyclic voltammograms exhibit a quasi-reversible redox peak attributed to the redox couple of Cu II /Cu I in the poten- tial range of 240 to −300 mV or 400 to −380 mV [32]. The mean peak potential E 1/2 = (E pa + E pc )/2 was −45 mV for 1-CPE, and −5 mV for 2-CPE.…”

“…An SCE and a platinum wire were used as reference and auxiliary electrodes, respectively. The bulk modified CPEs (1-CPE and 2-CPE) were fabricated following literature methods and taken as working electrodes [32]. (3-bpfp) (2, 2 …”

“…As potential electrochemical and electrocatalytic materials, copper(II) complexes have the ability to undergo a reversible one-electron redox process [32,33]. To study the redox properties of the title copper(II) complexes, carbon paste electrode bulk-modified with complexes 1 and 2 (1-CPE and 2-CPE) were fabricated as working electrodes.…”

An electrochemical sensing platform based on a new copper complex for the determination of hydrogen peroxide and nitrite

“…Meanwhile, the corresponding oxidation peak currents decreased, which indicated that Cu-CPE had good electrocatalytic activity toward the reduction of hydrogen peroxide. The possible reaction processes could be described using the following equations [19,28]: The inset of figure 3 shows that the catalytic current is linear versus hydrogen peroxide concentration in the range of 0.2-2.0 µM. The linear regression equation was I pc (µA) = -10.63C(µM)-7.939 with a correlation coefficient of 0.998.…”

“…Recently, considerable efforts have been directed toward the study of Cu(II) complexes incorporating pyridine, thioether, imidazole and imine donors, which not only stem from their fascinating structures but also from their potential applications as new materials [14][15][16][17]. Wang et al studied the electrocatalytic reduction of NO − 2 by copper complexes containing the chelating ligand dipyrido[3,2-d:2 ,3 -f]quinoxaline [18,19]. The electrochemistry and electrocatalysis of copper complexes with various ligands have been investigated by several groups [20][21][22].…”