scispace - formally typeset
Search or ask a question
Topic

Supporting electrolyte

About: Supporting electrolyte is a research topic. Over the lifetime, 5011 publications have been published within this topic receiving 104172 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: Compared with the conventional stripping approach, this chemically modified glassy carbon electrode procedure presented good discrimination against interference from Cu(II) in up to 10-fold molar excess.
Abstract: In this work, the organic compound 2-mercaptobenzimidazole was covalently bound on the surface of a glassy carbon rod, via silanization, yielding a material capable of selectively complexing Hg2+ ions. This material was applied as an electrode for voltammetric determination of mercury(II) following its nonelectrolytic preconcentration. After exchanging the medium, the voltammetric measurements were carried out by anodic stripping in the differential pulse mode (pulse amplitude, 50 mV; scan rate, 1.25 mV s-1) using 10-2 mol L-1 NaSCN solution as supporting electrolyte. An anodic stripping peak was obtained at 0.06 V (vs SCE) by scanning the potential from −0.3 to +0.3 V. After a 5 min preconcentration period in a pH 4.0 Hg2+ solution, this electrode shows increasing voltammetric response in the range 0.1−2.2 μg mL-1, with a relative standard deviation of 5% and a practical detection limit of 0.1 μg mL-1 (5.0 × 10-7 mol dm-3). Compared with the conventional stripping approach, this chemically modified glass...

61 citations

Journal ArticleDOI
TL;DR: In this article, the electrochemical oxidation and re-reduction of N′,N′, N,Tetrahexylphenylene diamine (THPD) deposited in form of microdroplets on a basal plane pyrolytic graphite or gold electrode is shown to be a chemically reversible process in the presence of aqueous electrolyte media containing NO3−, SCN−, ClO4−, or PF6−.
Abstract: The electrochemical oxidation and re-reduction of N′,N′,N,N-tetrahexylphenylene diamine (THPD) deposited in form of microdroplets on a basal plane pyrolytic graphite or gold electrode is shown to be a chemically reversible process in the presence of aqueous electrolyte media containing NO3−, SCN−, ClO4−, or PF6−. Sharp voltammetric responses with a mid point potential, Emid, characteristic of the type of anion and its concentration are observed. The oxidation product, an ionic liquid, undergoes rapid ion exchange when the anion of the aqueous electrolyte is exchanged with anions of lower Emid replacing anions of higher Emid. Although the effect of the supporting electrolyte cation in the case of the alkali metals K+, Na+, and Li+ is not significant, a considerable change in the voltammetric peak shape and Emid occurs in the presence of protons. This effect, attributed to the protonation of THPD, is also sensitive to the type of anion present with anions of lower Emid causing more facile protonation. After protonation of THPD, oxidation and re-reduction can be shown to be associated with H+ expulsion and uptake. Deposited onto the rough surface of a gold coated planoconvex quartz crystal oscillator the [THPD+ClO4−]oil deposit can be observed in form of micron-sized droplets in SEM images. A strong frequency response of the crystal oscillator in an electrochemical quartz crystal microbalance experiment associated with the oxidation and re-reduction of THPD can be detected but is not related to changes in mass. Rather, this frequency response may be attributed to changes in the viscosity and/or coverage of the oily deposit.

61 citations

Journal ArticleDOI
TL;DR: In this article, square wave voltammetry is employed to examine the electro-oxidation of nitrite and the reaction mechanism and electrode kinetics are investigated, pointing out the effects of the solution pH, the electrode material (glassy carbon, edge plane pyrolytic graphite and gold) and the supporting electrolyte.

61 citations

Journal ArticleDOI
TL;DR: In this paper, the electrocatalytic oxidation of methanol at a glassy carbon electrode modified by a thin film of poly(o-aminophenol) (PoAP) containing Pt, Pt-Ru and Pt-Sn microparticles has been investigated using cyclic voltammetry as analytical technique and 0.10m perchloric acid as supporting electrolyte.
Abstract: The electrocatalytic oxidation of methanol at a glassy carbon electrode modified by a thin film of poly(o-aminophenol) (PoAP) containing Pt, Pt-Ru and Pt-Sn microparticles has been investigated using cyclic voltammetry as analytical technique and 0.10 M perchloric acid as supporting electrolyte. It has been shown that the presence of PoAP film increases considerably the efficiency of deposited Pt microparticles toward the oxidation of methanol. The catalytic activity of Pt particles is further enhanced when Ru or specially Sn is co-deposited in the polymer film. The effects of various parameters such as the thickness of polymer film, concentration of methanol, medium temperature as well as the long term stability of modified electrodes have also been investigated.

61 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive electrochemical investigation of the dissolved oxygen in DMSO containing 0.1 M TBAP as the supporting electrolyte was presented. But the calculated k0 values are different from the previously cited values.

61 citations


Network Information
Related Topics (5)
Aqueous solution
189.5K papers, 3.4M citations
86% related
Adsorption
226.4K papers, 5.9M citations
83% related
Oxide
213.4K papers, 3.6M citations
82% related
Electrolyte
124.6K papers, 2.3M citations
81% related
Nanoparticle
85.9K papers, 2.6M citations
81% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202335
2022104
2021109
2020122
2019122
2018147