Abstract
The twodimensional MX 2-slabs of titanium, niobium and tantalum dichalcogenides present in contact with electrolyte solutions matrix units of highly flexible and reversible solid state redox systems. In the reduced polyelectrolyte state (negative charge density of layers = 0.1–0.3 e −/unit cell) exchangeable solvated cations are located in the interlayer space. Cation density is coupled with the redox state of the layers. In the oxidized state (charged density = 0) layers are held together by van der Waals bonding. A high degree of cooperativity is found for these topotactic systems. It is shown in addition that many so-called intercalation compounds of dischalcogenides are reduced forms with exchangeable cations in the interlayer space.
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