THE ROLE OF PHYSICOCHEMICAL PROPERTIES ON ELECTROCHEMICAL PERFORMANCE FOR ONE DIMENSIONAL MANGANESE OXIDE ELECTROACTIVE MATERIALS

摘要

Hollandite and cryptomelane (M_xMn8O_(16), OMS-2) structured materials consist of octahedral units of edge-sharing manganese oxide octahedra (Mn06) which interlink to form tunnels of 2 x 2 (～0.46 nm) dimensions (Figure 1). Bimetallic hollandite type materials have been prepared where cations with 1+ or 2+ charge partially occupy locations within the manganese oxide tunnels, and the Mn cations possess mixed 3+ and 4+ oxidation states. Typically, the ion located within the tunnel is inert, such as for potassium cryptomelane, however, silver hollandite is an interesting case as the Ag+ cationic center is potentially electrochemically active.