Mesures de Conductivité Et de Coefficients de Diffusion Dans Les Mélanges Eau ‐ Hydroxyde de Sodium

Abstract

SUMMARYMeasurements of conductivity and diffusion constants were carried out in H20-NaOH mixtures at NaOH mole fractions ranging from 0.02 to 0.6 (tmax -200°C). Equivalent conductance isotherms and diffusion isotherms of the Tc103~-and Pb0Z2-ions do not show any particular occurrence when the corresponding activation energy values exhibit a broad maximum at about XN~OH = 0.3 and a sharper maximum at QaoH = 0.5. This last composition corresponds to the NaOH.1 H20 distectic. A transition in the mechanism of conductance in molten NaOH hydrates from the proton transfer mechanism to the hydrodynamic mechanism can be suggested.

Graphene Oxide‐Supported β‐Tin Telluride Composite for Sodium‐ and Lithium‐Ion Battery Anodes

“…The use of selenides has recently been reported, as selenium is more conductive (10 −4 S m −1 ) than sulfur, and polyselenides are less soluble than polysulfides . The next chalcogen in row 5 of the periodic table is tellurium, exhibiting several advantages compared to selenium and sulfur: its conductivity is several orders of magnitude higher (200 S m −1 ), it does not form soluble sodiated forms, and the relative volume change associated with sodiation is smaller due to its larger atomic size. The smaller relative volume change prevents electrode pulverization upon repeated charge–discharge cycling.…”