Electrochemical reduction of oxygen and hydrogen peroxide catalyzed by a surface copper(II)-2,4,6-tris(2-piridil)-1,3,5-triazine complex adsorbed on a graphite electrode

51Citations
Citations of this article
24Readers
Mendeley users who have this article in their library.
Get full text

Abstract

A graphite electrode irreversibly adsorbed by 2,4,6-tris(2-piridil)-1,3,5- triazine (abbreviated as TPT) was examined by cyclic voltammetry. The adsorbed TPT exhibited two irreversible reduction waves in the potential range of -0.7 and -1.0 V (versus SCE). Upon strong adsorption, TPT can serve as a coordination ligand for copper ions to form a surface complex. Its three adjacent nitrogen positions provide strong affinity to the metal ions and bond copper(II) to an electrode surface. A 1:1 coordination between Cu(II) or Cu(I) and the TPT ligand to form [Cu(II)(TPT)]2+or [Cu(I)(TPT)]+is the predominant process, evidenced by spectrophotometry, surface cyclic voltammetry, and coordinated structural feasibility of Cu(II)/Cu(I)-TPT complexes. The predominant copper(II)-TPT surface complex shows a reversible redox wave, which is identified as one-electron process of [Cu(II)(TPT)]2+↔ [Cu(I)(TPT)]+. The electrode adsorbed by [Cu(II)(TPT)]2+complex showed electrocatalytic activity towards oxygen and/or hydrogen peroxide reductions. The catalyzed reduction of oxygen and hydrogen peroxide were identified as four-electron and two-electron process to form water. It is suggested that the possible electrocatalytic reductions were due to an inner-sphere mechanism, which involved a coordination between substrate (O2or H2O2) and [Cu(I)(TPT)]+. The reduction kinetics were also investigated by a rotating disk electrode method. © 2004 Elsevier B.V. All rights reserved.

Cite

CITATION STYLE

APA

Dias, V. L. N., Fernandes, E. N., Da Silva, L. M. S., Marques, E. P., Zhang, J., & Marques, A. L. B. (2005). Electrochemical reduction of oxygen and hydrogen peroxide catalyzed by a surface copper(II)-2,4,6-tris(2-piridil)-1,3,5-triazine complex adsorbed on a graphite electrode. Journal of Power Sources, 142(1–2), 10–17. https://doi.org/10.1016/j.jpowsour.2004.09.032

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free