Synthesis of LaMnO₃-reduced graphene oxide or Sr composite and their application in electrochemical properties

Abstract

Perovskite structural metal oxides as electrode materials present promising and potential properties due to excellent storage characteristics. Herein, series of perovskite type LaMnO 3 nanopowders were synthesized by the 'sol-gel' method with a heat treatment at different temperatures (700°C-900°C) for different times. The morphology characterization, structures and electrochemical performances were investigated. The preferable sample for electrochemical energy storage device can be obtained at 900°C with 2 h annealing. Furthermore, to improve the properties of the electrode materials, the samples were combined and rectified with reduced graphene oxide (rGO) and strontium (Sr), respectively. The results indicate that the rGO/Sr-doped LaMnO 3 oxide materials have excellent electrochemical properties. These findings are beneficial for the selection and preparation of electrode materials.

Vacancy‐induced LaMnO3 Perovskite as Bifunctional Air‐breathing Electrode for Rechargeable Lithium‐Air Battery

“…Figure 4 shows the nitrogen adsorption‐desorption isotherm obtained for the hydrothermally‐derived LaMnO 3 sample. It is seen that the observed adsorption‐desorption profile is Type‐IV isotherm which is characteristic of a sample having mesoporous nature [23,24] . The BET specific surface area of the LaMnO 3 sample was found to be 75 m 2 g −1 .…”

“…It is seen that the observed adsorption-desorption profile is Type-IV isotherm which is characteristic of a sample having mesoporous nature. [23,24] The BET specific surface area of the LaMnO 3 sample was found to be 75 m 2 g À 1 . The BJH curve shown in the inset of Figure 4 reveals that the pores are in the range of 2-10 nm.…”

Role of Electrolytes in Electrochemical Properties of La2SrV2O9–rGO Composite as Electrode Material

“…LaMnO doped with rGO synthesized by sol-gel method shows reasonable capacitance and graphene-coated paper electrodes were performed but shows less capacitance of about 100 F g −1 . [31][32][33][34][35][36][37][38] The performance of an electrolyte depends on wide voltage window, high electrochemical stability, low resistance and toxicity. Commonly used electrolytes are organic and aqueous.…”

Nanostructured Fe-Substituted LaMnO3 Perovskites as a High-Performance Electrode for Supercapacitors

“…17 LaMnO 3 was combined with Strontium (Sr) and reduced graphene oxide to approach the efficient storage device. 18 Consequently, LaMnO 3 is considered favorable material for typical supercapacitors applications.…”