Electrochemical oxidation and reduction of La4Ni3O10 in alkaline media

In this work we used electrochemical polarization for oxidizing and reducing, in a controlled way, the Ruddlesden-Popper phase La₄Ni₃O₁₀. With a careful choice of electrochemical parameters, we were able to obtain samples of La₄Ni₃O_10± never obtained before. The oxygen stoichiometry can range between 9.78 (=–0.22) and 10.12 (=0.12). The oxidized phase, La₄Ni₃O_10.12, was obtained using a galvanostatic mode (I=20 A) and the reduced phase, La₄Ni₃O_9.78, using potentiostatic conditions (E=0.46 V). The evolution of the electrical conductivity has been studied as a function of .