New organic-inorganic nanocomposite materials for energy storage applications
- Univ. of Wyoming, Laramie, WY (United States). Dept. of Chemistry
A method is described by which the disulfide dimer of 2,5-dimercapto-1,3,4-thiadiazole (diDMcT) can be oxidatively intercalated into the layered structure of a V{sub 2}O{sub 5} xerogel. This intercalation reaction produces a new organic-inorganic composite material with a layer spacing of 13.5 {angstrom}, in contrast to the 11.55 {angstrom} spacing for the parent V{sub 2}O{sub 5} xerogel. During this oxidative intercalation, the diDMcT is polymerized to produce a polymer with thiadiazole rings linked by disulfides in the polymer main chain PDTT. The composite material is characterized by UV-visible spectroelectrochemistry, X-ray diffraction, FTIR, and electrochemistry. The electrochemical experiments comprised charging (oxidation) and discharging (reduction) of the material, with the bulk of the redox reaction occurring over a broad potential range of 0.5 to {minus}0.6 V versus saturated calomel electrode. The cyclic voltammogram of the composite material shows features that can be attributed to the DMcT-PDTT redox response. However, during or after reduction of the composite, the monomeric DMcT dithiolate appears to be expelled from the V{sub 2}O{sub 5} interlayer region, leading to an evolution of the electrochemical response back to that of the original V{sub 2}O{sub 5} material. Evidence is presented suggesting that the V{sub 2}O{sub 5} host material facilitates the redox reactions of the thiol-disulfide redox couple while it is within the interlayer region.
- OSTI ID:
- 679999
- Report Number(s):
- CONF-980314--
- Journal Information:
- Langmuir, Journal Name: Langmuir Journal Issue: 3 Vol. 15; ISSN LANGD5; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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