Copper/cobalt-doped LaMnO3 perovskite oxide as a bifunctional catalyst for rechargeable Li-O2 batteries

Halide Perovskite Materials for Energy Storage Applications

“…The halide perovskite materials could be extended to a range of secondary battery systems. The application of halide perovskites in various energy systems is promising, since the perovskite structures have been found applicable to a number of alkali-ion batteries, [241,242] lithium-sulfur batteries, lithiumoxygen batteries, [243][244][245][246][247][248][249][250][251][252][253][254][255][256] and zinc-air batteries. [257][258][259][260][261] Further deployment depends on the improvement of the halide perovskites stability when they are in contact with the salient species in the battery devices, such as the aqueous environment and basic/acidic electrolyte.…”

Graphene Nanosheet-Wrapped Mesoporous La0.8Ce0.2Fe0.5Mn0.5O3 Perovskite Oxide Composite for Improved Oxygen Reaction Electro-Kinetics and Li-O2 Battery Application

“…In Mn 2p 3/2 , two doublet peaks were observed for the co-existence of the mixed oxidation state of Mn 3+ and Mn 4+ . Several Mn 3+ can be oxidized into Mn 4+ while doping with other elements on the B site; however, the high intensity of Mn 3+ indicates that the main component is present in the form of +3 in composite [ 27 ]. The ratio of Mn 4+ /Mn 3+ was calculated as 0.68, and it was obtained from the peak area of Mn 4+ and Mn 3+ .…”

“…peak indicates the stronger covalence of the B-O bond, which favors the O 2 − /OH − exchange. The obtained results suggest that the doping of Ce and Fe in LaMnO 3 perovskite structures can increase the Mn 4+ generation and oxygen vacancies, which will improve the kinetics of ORR and OER performance [ 25 , 26 , 27 ].…”

“…In addition, the RDE measurements were conducted using the LCFM(8255)-gly/GNS composite electrode at different rotational speeds in the range of 400–2500 rpm ( Figure 5 C). The electron transfer number (n) can be calculated from these RDE polarization curves, which is one of the major factors for ORR catalyst evaluation [ 25 , 27 ]. To analysis the ORR reaction kinetics, the Koutecky–Levich Equations (1) and (2) can be followed based on the relation of inverted limiting current density J −1 versus square roots of rotation speed (ω −1/2 ), the data can be seen in Figure 5 D. where J , J L and J K are the measured currents, diffusion-limited current and kinetic current densities, respectively, ω is the electrode angular rotation speed, n is the electron transfer number, F is the Faraday constant (96485 A∙s mol −1 ), ν is the kinematic viscosity (0.01 cm 2 s −1 ), C 0 is the bulk concentration (1.9 × 10 −5 mol cm −3 ) and D 0 is the diffusion coefficient (1.2 × 10 −6 mol cm −3 ) of dissolved O 2 in 0.1 M KOH electrolyte.…”

High-Performance-Based Perovskite-Supported Nanocomposite for the Development of Green Energy Device Applications: An Overview

“…The research findings of Lv and his coworkers showed that the perovskite-type LaMn 0.8 Cu 0.2 O 3 and LaMn 0.8 Co 0.2 O 3 had good bi-functional catalytic activities due to the presence of Mn 4+ /Mn 3+ and oxygen vacancies. The study exemplified that B-site doping is an effective solution to improve the ORR and OER catalytic activity of perovskite in Li-O 2 batteries [ 124 ].Many researchers have shown that the catalytic activity of the ABO 3 perovskite toward the oxygen reduction reaction and oxygen evolution reaction is enhanced while tuning the A site’s deficient and excessive stoichiometry [ 125 ]. In a study, Miao and his coworkers chose the simplest Mn-based perovskite (LaMnO 3 ) to explain the deficient effects and enhancing mechanisms on both ORR and OER.…”