Oxygen-containing surface groups

Centeno TA, Stoeckli F. The role of textural characteristics and oxygen-containing surface groups in the supercapacitor performances of activated carbons. Electrochimica Acta 2006 52 560-566. [Pg.464]

The oxygen-containing surface groups are responsible for the potential response of carbon electrodes to hydrogen ion concentration in. solution. Potential measurements of carbon materials in buffer solutions show that the relationship E = /(pH) is linear in the pH range 2.0-7.0 and can be de.scribed by a linear equation with a slope between 20 and 60 mV/pH. depending on the nature of the electrode material [160,161]. [Pg.140]

Formation of surface complexes with nitrogen- and/or oxygen-containing surface groups (D—N sample)... [Pg.205]

As for the surface characterization of the catalysts, FTIR is not yet a quantitative method to evaluate the number of several oxygen-containing surface groups of a support or a catalyst. As a consequence, FTIR is unable to distinguish a catalyst prepared by precipitation from another one prepared by incipient wetness impregnation. We have also shown that the absorption band observed at 1384 cm after oxidation is more probably due to adsorbed nitrate groups than carbonate or carboxylate functions. [Pg.1001]

The method of deposition-precipitation can also be used for the preparation of catalysts based on inert supports, like carbon nanofibers (CNFs). This has been demonstrated first in the case of the Ni/CNF system (35). To make the CNF surface reactive, the CNFs were first submitted to an oxidative pretreatment by reflux with acidic solution, HNOj (36), or a mixture of HNO3 and H2S04(35). This treatment induced the formation of polar oxygen-containing surface groups resulting from the hydrolysis of anhydric carboxyl groups. The consequence is a better wettability of the aqueous precursor solutions and a decrease of the PZC from a pH of 5 for the untreated fibers to a pH of 2-3. [Pg.332]

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