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The mixed-anion fluorosulfide Yb3F4S2 was examined as a solid electrolyte for all-solid-state fluoride-ion batteries. The synthesized Yb3F4S2 compound by solid-state reaction under vacuum contained Yb2O2S impurities, which originated from the starting materials. The conduction properties of Yb3F4S2 are discussed herein based on the electrochemical impedance and DC blocking measurements, which indicate mixed ionic and electrical conduction of Yb3F4S2. Yb L3-edge X-ray absorption measurements demonstrate the mixed valence state of ytterbium ion.

In order to improve oxygen reduction performances of an air electrode using perovskite type La 0.7 Ca 0.3 CoO 3 as an electrocatalyst, a layered double hydroxide (LDH) containing magnesium and aluminum was examined as an ionconducting additive. Although the addition of LDH impeded gas permeation of the catalyst layer of the electrode, it was effective in reducing charge transfer resistance of the electrode, and as a result, the oxygen reduction reaction of the air electrode was remarkably enhanced.

The adsorption and dissociation of H2 on the Na2O (110) surface have been studied with the first-principles molecular dynamics method. It is found that the adsorption configuration is energetically preferred when the H2 molecule is situated at the bridge site of the Na and O atoms, which indicates the formation of a Na−Hδ-···Hδ‘+−O dihydrogen bond, as confirmed by the charge distribution features and bond lengths between the concerned atoms. The molecular dynamics simulations reveal the dissociation of the newly discovered H···H dihydrogen bond, which facilitates the Na2O + H2 → NaH + NaOH reaction.