Cation substitution of B-site in LaCoO3 for bifunctional oxygen electrocatalytic activities

Vacancy effect on the electrocatalytic activity of LaMn1/2Co1/2O3−δ for hydrogen and oxygen evolution reactions

“…The structure of the parent material is reported before. 10 The oxygen-deficient material also has the same structure, as evident from the powder X-ray diffraction data (Fig. 2a and Fig.…”

“…The overpotential for LaMn 0.5 Co 0.5 O 3 is 460 mV, consistent with the values reported for similar compositions. 10,29 However, the overpotential is drastically decreased, by about 100 mV, when oxygen-deficiencies are incorporated in the material, giving Z 10 E 360 mV for LaMn 0.5 Co 0.5 O 3Àd . The overpotential of the oxygen-deficient material is lower than that reported for the precious metal catalyst RuO 2 (Z 10 = 400 mV), 30 and those of some other oxide catalysts, such as Co 3 O 4 (Z 10 = 400 mV) 31 and CaSrFeMnO 6Àd (Z 10 = 370 mV).…”

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.…”

“…The leading search for such catalysts is quite successfully carried out among many compounds of transition metals or their combinations (borides, carbides, nitrides, phosphides, chalcogenides, oxides, or hydroxides, etc.). In addition, these multicomponent systems and composite materials containing carbon nanosheets or nanotubes have been actively studied in recent years as electrocatalysts for Zn-air batteries and water splitting. , It fully applies to Ln- and Co-containing complex oxides of the AB O 3 -type, where for perovskites, A -positions usually correspond to a rare-earth or alkaline earth element, and B is commonly a transition metal or a combination thereof. − In general, it is considered that both types of metal influence the oxygen-catalytic activity of perovskites in the A - and B -sites . 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 .…”

Regulating the Electronic Structure of Ruddlesden–Popper-Type Perovskite by Chlorine Doping for Enhanced Oxygen Evolution Activity

“…More importantly, introducing defects into A, B, or oxygen atomic sites of perovskite-type structures would significantly change the electronic configuration of transition metals, thereby enhancing OER performance. − Among them, the anion mixing strategy is considered a very promising approach to exploring high-performance catalysts . As far as we know, chlorine halide (Cl) has a low electronegativity to oxygen (O), which can enhance the covalence of metal–oxygen and promote charge transfer in the electrocatalytic process.…”