Electrocapillary maximum and potential of zero charge of carbon aerogel

文献情報

出版日 2010-06-03

DOI 10.1039/B916331J

インパクトファクター 3.676

著者

Jürgen Biener, Dominik Kramer, Raghavan N. Viswanath, Theodore F. Baumann, Alex V. Hamza

原文を見る

要旨

We present an electrochemical study of carbon aerogel (CA) in aqueous sodium fluoride solutions, focusing on the comparison of two quantities that are related to the potential of zero charge (pzc): the capacitance minimum and the ‘electrocapillary maximum’ of the surface forces. Capacitance minima are well resolved in our samples. Their potential emerges reproducibly as around 90 mV (vs. Ag/AgCl in KCl), similar to the value, 70 mV, of bulk glassy carbon which we use for comparison, and similar to previous reported pzc values for carbon materials. Significantly, no electrocapillary maximum is found in this potential range. This demonstrates that the pzc does not necessarily coincide with the potential of the maximum of surface stress. We also determined the area-specific capacitances, ca = 2.8 μF cm−2, which agrees well with reports for the basal-plane of graphite single crystals. Our experiments yield large reversible strain amplitudes, up to 0.45%.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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