Photoelectrochemical characterization of A{sub {ital x}}C{sub 60}(A=Li,K) thin films in a solid state cell
- Instituto de Fisica, Facultad de Ingenieria, C. C. 30, 11000 Montevideo (Uruguay)
- Dipartimento di Chimica, Universita ``La Sapienza``, 00185 Roma (Italy)
Solid-state electrochemical cells have been prepared with C{sub 60} vacuum-evaporated thin films, a Li- or K-source counter electrode and a polymer PEO-LiClO{sub 4} (PEO-KCl) electrolyte. The electrochemical intercalation in C{sub 60} of Li{sup +} (or K{sup +}) ions has been performed under constant current conditions up to a formal stoichiometry of the fulleride film equal to Li{sub 12}C{sub 60} (K{sub 5}C{sub 60}). A complete charge-transfer process from the intercalated alkali to the alkali-metal compound has been assumed. Several quasi-equilibrium potential plateaux were observed during intercalation, that we associate with the coexistence of phases with different intercalant concentration. The electrochemical intercalation process is irreversible to a large extent. Photoelectrochemical spectroscopy of the fulleride films was done {open_quote}{open_quote}in-situ{close_quote}{close_quote} at different moments of the intercalation reaction by illuminating the film electrodes through the transparent and conducting glass substrates. The photoelectrochemical response shows a minimum for {ital x}=3 (in the K{sub {ital x}}C{sub 60} compound) and a maximum at {ital x}=4 (in both K{sub {ital x}}C{sub 60} and Li{sub {ital x}}C{sub 60} compounds), in agreement with previous conductivity results. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 451089
- Report Number(s):
- CONF-9409431-; ISSN 0094-243X; TRN: 9703M0094
- Journal Information:
- AIP Conference Proceedings, Vol. 378, Issue 1; Conference: Surfaces, vacuum and their applications, Cancun (Mexico), 19-23 Sep 1994; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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