Study on the electrochemical properties of Fe{sub 2}O{sub 3}-TiO{sub 2} films prepared by sol-gel process
- Academia Sinica, Shanghai (China). Shanghai Inst. of Optics and Fine Mechanics
- East China Univ. of Science and Technology, Shanghai (China). Inst. of Glass and Ceramics
Electrochemical materials (EC) are of importance in energy conservation and in control of temperature, lighting in buildings, automobiles, etc. Transparent Fe{sub 2}O{sub 3}(1 {minus} x)-TiO{sub 2}(x) (x = 0, 0.3, 0.5, 0.6, 0.7, 0.8, and 0.9 in molar fraction) thin films on indium-tin oxide (ITO)/glass substrates were made by sol-gel dip-coating. The iron-ion-containing sols were prepared from Fe(NO{sub 3}){sub 3} {center_dot} 9H{sub 2}O and Ti(OC{sub 4}H{sub 9}){sub 4} precursors. The electrochemical investigation of the Li{sup +} ion storage process in Fe{sub 2}O{sub 3}-TiO{sub 2} films has been made in a Pt/LiClO{sub 4}-PC(1 M)/Fe{sub 2}O{sub 3}-TiO{sub 2}/ITO cell between {minus}1.5 and 1.0 V potential range vs. saturated calomel electrode (SCE). The total electric charge inserted and extracted during a cycle has been determined by the cyclic voltammetry. The electric charge transition ability is mainly influenced by the composition and thickness of films, heat-treatment temperature, and the precursor concentration of sols. In a pure iron oxide system, amorphous Fe{sub 2}O{sub 3} exhibited better Li{sup +} ion storage behavior than {alpha}-Fe{sub 2}O{sub 3} phase. In the Fe{sub 2}O{sub 3}-TiO{sub 2} composite systems, Fe{sub 2}O{sub 3}(0.3)-TiO{sub 2}(0.7) films showed the best reversibility of the insertion-deinsertion process while their maximal Q/d value is about 0.12 mC/cm{sup 2} nm.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 511952
- Journal Information:
- Journal of the Electrochemical Society, Vol. 144, Issue 5; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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