Journal
CHEMICAL PHYSICS LETTERS
Volume 408, Issue 1-3, Pages 1-4Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2005.03.138
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Probe-beam deflection (PBD) was used to monitor concentration gradients of anions adjacent to the surface of a platinum electrode in acidic aqueous media containing H3PO4. PBD can measure the potential-dependent extent of adsorption of H2PO4 on the Pt electrode surface and permits the Langmuir isotherm to be fitted to the experimental data. The value thus obtained for the surface concentration was 1.3 x 10(-11) Mol mm(-2), or 1.7 atoms of Pt per H2PO4. Also, the electron transfer number obtained was 0.24, signifying an incomplete transfer of charge, and the equilibrium constant is 1.80 suggesting a reversible adsorption process. (c) 2005 Elsevier B.V. All rights reserved.
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