Evidence of oxygen intercalation and mobility at room temperature in oxides: An electrochemical quartz microbalance study of intercalation in La2CuO4

This paper offers direct evidence for the electrochemical intercalation of oxygen in an oxide with the K2NiF4 structure, namely, La2CuO4, at room temp erature. Organic solvents, as well as water, allow that reaction to occur. The charge-to-mass ratio evaluated from a comparison with fluoride intercal ation implies that either OH- or Odelta- species are being intercalated. Co mparison with previous work seems to favor the latter. If an oxygen with lo wer charge is moving, that could indeed explain why oxygen conductivity can be observed at such low temperatures.