A-site deficient La_0.52Sr_0.28Ti_0.94Ni_0.06O₃ by low-pulsed electric current treatment: achieved exsolution of B-site Ni nanoparticles and significant improvement of electrocatalytic properties

Abstract

A-site deficient La0.52Sr0.28Ti0.94Ni0.06O3 by low-pulsed electric current treatment: achieved exsolution of B-site Ni nanoparticles and significant improvement of electrocatalytic properties

Nonreducing Ambient Atmosphere: Pulsed Electric Current Treatment of Co/Ni Doped Perovskite Oxides to Achieve Exsolution Enhanced Electrochemical Performance

“…The two groups of perovskite powders were placed inside the sample tank, and the electric pulse equipment and the homemade pulse device were used to apply a PEC treatment to them. Optimizing the parameters of the previously reported PEC experiments, , the present experiments were performed using 600 V, 3 Hz current, and a pulse time of 90 s. After the pulse was completed, the powders were collected again. Figure shows a schematic of the PEC-processing device.…”

“…This method is conducted under a nonreducing ambient atmosphere and continuously supplies reducing electrons to promote exsolution and continuous growth of NPs. While the promotion of B-site NP exsolution using PEC treatment is dominated by doped Ni elements only, , the impact of PEC treatment on perovskite oxides doped with different B-site elements remains largely unexplored. The combined effect of oxygen vacancies and a surface cobalt oxide layer was demonstrated in soot combustion to give Co a relatively high CO oxidizing activity, and the exsolution of Co species promoted further mobility of the adsorbed oxygen species, thus increasing the activity of the whole surface.…”

Conductive origin and design principles of electrically controllable high conductivity La-doped perovskites

“…Neagu et al 2 found that perovskite materials with A-site defects are more likely to undergo metal NP exsolution on the surface of the materials in the same environment. Yu et al 14 also observed that A-site defects can promote the NP exsolution of perovskite, thus improving the electrocatalytic activity of the material under low pulse electric currents. Therefore, it is of great importance to design A-site defects and La element doping to enhance the conductivity of perovskite materials, and then apply them to PECINE to enhance the electrocatalytic properties of the materials.…”

“…In recent years, there has been growing interest in using exsolution techniques to enhance the electrocatalytic properties of perovskite materials. 1–6 Compared to the traditional high-temperature treatment under a reducing atmosphere for more than ten hours which promotes the exsolution of perovskite, 7–10 researchers have turned their attention to rapid and efficient exsolution processes, such as thermal shock, 11 plasma, 12,13 and pulse electric current; 14 especially, the use of pulse electric currents under non-reducing atmospheric ambient conditions has attracted extensive attention. Pulse electric current-induced nanoparticle exsolution (PECINE) offers several advantages, including simple process equipment, high exsolution efficiency, and a short experimental process.…”