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Potentiometric titration

About: Potentiometric titration is a research topic. Over the lifetime, 11681 publications have been published within this topic receiving 216077 citations.


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Journal ArticleDOI
TL;DR: In this article, a method for determination of intrinsic ionization and complexation constants of oxide surface sites from potentiometric titration data is reported using these experimental properties and the stoichiometry of surface reactions, surface charge, σo, adsorption density, Γi, and diffuse layer potentials, ψd, at the oxide/water interface.

1,493 citations

Journal ArticleDOI
TL;DR: In this article, the surface chemistry is affected by the type of nitrogen precursor and specific groups present on the surface before the treatment leading to the incorporation of nitrogen, and the most important functional groups affecting energy storage performance are pyrrolic and pyridinic nitrogen along with quinone oxygen.
Abstract: Microporous activated carbon originating from coconut shell, as received or oxidized with nitric acid, is treated with melamine and urea and heated to 950 °C in an inert atmosphere to modify the carbon surface with nitrogen- and oxygen-containing groups for a systematic investigation of their combined effect on electrochemical performance in 1 M H2SO4 supercapacitors. The chemistry of the samples is characterized using elemental analysis, Boehm titration, potentiometric titration, and X-ray photoelectron spectroscopy. Sorption of nitrogen and carbon dioxide is used to determine the textural properties. The results show that the surface chemistry is affected by the type of nitrogen precursor and the specific groups present on the surface before the treatment leading to the incorporation of nitrogen. Analysis of the electrochemical behavior of urea- and melamine-treated samples reveal pseudocapacitance from both the oxygen and the nitrogen containing functional groups located in the pores larger than 10 A. On the other hand, pores between 5 A and 6 A are most effective in a double-layer formation, which correlates well with the size of hydrated ions. Although the quaternary and pyridinic-N-oxides nitrogen groups have enhancing effects on capacitance due to the positive charge, and thus an improved electron transfer at high current loads, the most important functional groups affecting energy storage performance are pyrrolic and pyridinic nitrogen along with quinone oxygen. (C)2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

1,409 citations

Journal ArticleDOI
TL;DR: In this paper, a critical review of conversion constants amongst various reference electrodes reported in the literature reveals that in most cases the comparisons of redox potential values are far from accurate, and therefore, caution should be exercised when one is comparing the redox properties of complexes measured in CH 3 CN solutions versus different reference electrodes.

1,212 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of unknown junction potentials on acid dissociation constants has been investigated, with particular references to nitrilotriacetic acid (NTA) and ethylenediaminetetric acid (EDTA).

1,197 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023215
2022533
2021198
2020203
2019192
2018205