Ag is considered to be one of the best candidates for oxygen reduction reaction electrocatalysts in alkaline media for application in various electrochemical energy devices. In this study, we demonstrate that water activation is a key factor in enhancing the ORR activity in alkaline media, unlike in acid environments. Ag supported on LaMnO3 having a high oxophilicity showed a markedly higher OR...

The magnetic structure of LaMnO3 is investigated on three-dimensional clusters of MnO6 octahedra by using a combination of relaxation and Monte Carlo techniques. It is found that the cooperative Jahn-Teller phonons lead to the stabilization of A-type antiferromagnetic and C-type orbital structures in the physically relevant region of parameter space for LaMnO3 with small corrections due to tilt...

Ab initio studies of the stability of orbital ordering, its coupling to magnetic structure and its possible origins ~electron-phonon and/or electron-electron interactions! are reported for two perovskite systems, LaMnO3 and KCuF3. We present an average spin state calculational scheme that allowed us to treat a paramagnetic state and to succesfully describe the experimental magnetic or orbital p...

Single-phase powders of LaMnO3 and LaCoO3, lanthanum-based perovskites, were synthesized using the citric acid combustion method. The surface concentration La in obtained powder was higher LaCoO3 than LaMnO3. These samples decomposed 2-naphthol water dark. decomposition reaction is attributed to Mars–van Krevelen (MvK) mechanism because temperature dependence, activation energy, valence change ...

Developing a highly stable and non-precious, low-cost, bifunctional electrocatalyst is essential for energy storage conversion devices due to the increasing demand from consumers. Therefore, fabrication of an emerging focus promotion dissemination storage/conversion devices. Spinel perovskite transition metal oxides have been widely explored as efficient electrocatalysts replace noble metals in...

In this work, structural and magnetic properties of LaMnO3+δ compound prepared by citrate precursor method and annealed in presence of oxygen are investigated. The structural characterization of LaMnO3+δ by X-ray powder diffraction and using X’pert package and Fullprof program is evidence for a rhombohedral structure (R-3c space group) confirmed by FTIR measurement. The magnetic measurements sh...

Dopamine  (DA)  and  uric  acid  (UA)  are  two  of  important bimolecular widely  circulated  in  body blood. Therefore, development of simple and rapid methods for simultaneous determination of them in  routine  analysis  has  a  great  significance  for  many  researchers. Therefore,  for  the  first  time, nanocomposite  of  graphene  (Gr)LaMnO3has  been  utilized  to  fabricate  the  new  ...