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- Adsorption of dihydrogen phosphate ion on platinum electrodes in aqueous media monitored by probe-beam deflection
- Bidoia, Ederio Dino
- Universidade Estadual Paulista (UNESP)
- 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 × 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. © 2005 Elsevier B.V. All rights reserved.
- Chemical Physics Letters, v. 408, n. 1-3, p. 1-4, 2005.
- Charge transfer
- Negative ions
- Anion adsorption
- Electrode surfaces
- Probe-beam detection
- Acesso restrito
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