Enhanced oxygen and hydrogen evolution activities of Pt/LaCoO3 perovskite oxide via in-situ exsolution of Pt nanoparticles

Rapid electrochemical detection of MiRNA-21 facilitated by the excellent catalytic ability of Pt@CeO2 nanospheres

“…04-0802). 40 The above results verified the high purity and crystallinity of the synthesized Pt@CeO 2 NSs. The presence of O 1s, Ce 3d and Pt 4f in the XPS full spectrum further confirmed the elemental chemical states and electronic structure of Pt@CeO 2 NSs ( Fig.…”

The Multifunctionality of Lanthanum–Strontium Cobaltite Nanopowder: High-Pressure Magnetic Studies and Excellent Electrocatalytic Properties for OER

“…As mentioned in the introduction, interest in Ln- and Co-containing perovskites as electrocatalysts for OER in an alkaline environment has increased significantly recently. ,− ,− In order to find out the OER activity for water splitting of the prepared LSCO samples, electrochemical tests were carried out in 1 M KOH electrolyte (pH 14) with the following sequence: multiple current–voltage (CV) scans (until stable electrode operation is achieved), alternative current (AC) impedance, recording of LSV curves with iR correction, long-term chronopotentiometry tests (at a current density of 10 mA·cm –2 ) and reregistration of LSV curves. It should be emphasized that Co- and Ni-containing complex oxides can be entirely or partially in situ transformed into oxides/hydroxides due to electrochemical processes in an alkaline medium. , Accordingly, after a long electrochemical treatment, we investigated the electrode materials to verify the stability of the LSCO catalysts.…”

“…However, the high electrocatalytic activity of perovskites for OER in an alkaline medium is primarily the result of the redox behavior of the hybridization of transition metal 3d and oxygen 2p orbits . Numerical studies of perovskites as electrocatalysts revealed that, in addition to the chemical composition, activity in oxygen electrocatalysis reactions is also affected by a significant number of factors, namely, method and conditions of preparation of the material (annealing at different temperatures and in a controlled atmosphere can cause different types of defects on the surface); , particle size, porosity, and shape (affects active surface area); − , doping; ,,,, and amorphization of the surface …”

“…29 However, the high electrocatalytic activity of perovskites for OER in an alkaline medium is primarily the result of the redox behavior of the hybridization of transition metal 3d and oxygen 2p orbits. 30 Numerical studies of perovskites as electrocatalysts revealed that, in addition to the chemical composition, activity in oxygen electrocatalysis reactions is also affected by a significant number of factors, namely, method and conditions of preparation of the material (annealing at different temperatures and in a controlled atmosphere can cause different types of defects on the surface); 22,31 particle size, porosity, and shape (affects active surface area); [20][21][22]32 doping; 19,23,25,33,34 and amorphization of the surface. 35 It should be noted that, as demonstrated by Mefford et al, 36 for LSCO catalysts, oxygen vacancy defects are a crucial parameter in improving the electrocatalysis of oxygen on metal oxide surfaces, due to which they can control the physical parameters of the ion diffusion rate and reflect the basic electronic structure of the catalyst.…”

Emerging Exsolution Materials for Diverse Energy Applications: Design, Mechanism, and Future Prospects

“…Pt nanocatalysts have also been used to improve the OER and HER properties of surface-exsolved nanoparticles. Li et al 134 designed exsolved Pt nanoparticles on a LaCo 0.94 Pt 0.06 O 3 perovskite system. The enhanced electrochemical properties of the exsolved Pt nanoparticles and the oxygen vacancies formed during the exsolution process improved the OER and HER performance in alkaline electrolytes.…”