Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 16, Pages 5456-5463Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.02.073
Keywords
terephthalic acid; terephthalate; adsorption; IRAS; single crystal; cold electrode
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Adsorption of terephthalic acid on Au(100), Au(111) and Au(110) electrodes in neutral solution has been investigated using in situ Fourier transform infrared (FT-IR) spectroscopy, differential capacity measurements and scanning tunneling microscopy (STM). At negative potentials, the terephthalate anions in solution adsorb in a flat orientation onto the electrode via the pi electrons of the aromatic ring. At positive potentials, the terephthalate anions adsorb in a vertical orientation via the oxygen atoms of one of the carboxyl groups as a form of dianion. At more positive potentials, the anions adsorb in a vertical orientation as a form of hydrogen terephthalate. For the three electrodes examined, the overtone and/or combination bands, due to vertically oriented hydrogen terephthalate, were observed at 2642 and 2517 cm(-1), respectively. For the Au(111) electrode, STM observations indicated a flat orientation in the form of terephthalic acid. (c) 2008 Elsevier Ltd. All rights reserved.
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