Honeycomb LaMnO₃ Perovskite Synthesized by a Carbon Sphere as a Self-Sacrificing Template for Supercapacitors

Abstract

A honeycomb-shaped LaMnO 3 supercapacitor material has been successfully fabricated by a sol−gel method utilizing an as-prepared carbon sphere material as a template to control the morphology. The as-prepared materials were characterized by Xray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the N 2 adsorption− desorption isotherm method. Electrochemical tests including cyclic voltammetry (CV), galvanostatic charge and discharge (GCD) measurements, electrochemical impedance spectroscopy (EIS), and cycle life were also carried out to investigate the supercapacitor performance of the as-prepared materials. The experimental results reveal that when the calcination temperature of the dry gel is 600 °C, the performance of the honeycomb LaMnO 3 perovskites is better, and the specific capacitance (535 F g −1 ) of the honeycomb LaMnO 3 perovskites is higher than that of LaMnO 3 perovskites prepared by the sol−gel method without adding the carbon sphere as the template (247 F g −1 ). Therefore, as far as supercapacitor materials are concerned, the preparation method of honeycomb LaMnO 3 perovskites displays better application prospects.

Performance of sodium-ion supercapattery using LaMnO3 and rGO in non-aqueous electrolyte

“…25 Furthermore, according to Zhang et al , the oxygen vacancies in the LaMnO 3 drive the redox reaction that involves Mn 3+ /Mn 4+ . 25 The appearance of clear redox peak and their scan-rate-dependent current response confirm a typical faradaic feature of the LaMnO 3 electrode, and thus suitable for energy storage. Moreover, in the CV profile, a clear linear region with scan-rate-dependent current response is seen in the potential window from −0.5 to −1 V, which is attributed to the presence of an electrical double layer capacitance (EDLC) contribution.…”

“…31 Zhang et al fabricated a symmetric supercapacitor that could deliver a specific energy of 74.35 W h kg −1 at a specific power of 500 W kg −1 . 25 However, to the best of our knowledge, there are no reports on the sodium-ion and lithium-ion supercapattery features of LaMnO 3 in non-aqueous electrolyte. The dual redox ions, Mn 3+ and Mn 4+ , present in the LaMnO 3 can bring about cation vacancies that can be explored for Na + /Li + electrosorption/intercalation in the non-aqueous electrolyte.…”

“…19 Perovskites have good ionic conductivity and thermal stability owing to the defects associated with the crystal lattice, as well as high electron mobility, and hence they find extensive use as catalysts. 21 Owing to its good stability, ion/electron transport, and redox features, LaMnO 3 has also recently been considered as a supercapacitor electrode 22–26 and as a catalyst for the oxygen reduction reaction. 27,28 For example, Mo et al prepared calcium-doped LaMnO 3 by sol–gel synthesis and found that the supercapacitor device could deliver a specific energy of 7.6 W h kg −1 at a low power density of 160 W kg −1 .…”

POM-derived MoO3/CoMoO4mixed oxides directed by glucose for high-performance supercapacitors

“…[24][25][26] Carbon materials are widely utilized as sacrificial templates to assemble porous materials on account of convenient acquisition, regular morphology and easy removal. [27][28][29] In this procedure, carbon sphere precursors could be obtained via hydrothermal treatment of glucose, which could be decomposed under high temperature annealing.…”

One-Stage Hydrothermal Growth and Characterization of Epitaxial LaMnO3 Films on SrTiO3 Substrate

“…Lanthanum manganite perovskite (LaMnO 3 ) and derivatives are appealing complex oxides for their functional applications in high-temperature solid oxide fuel cells (SOFCs) [ 1 , 2 , 3 ], supercapacitors [ 4 , 5 , 6 ], volatile organic compound (VOC) elimination [ 7 , 8 ], photocatalysis [ 9 ] and spintronic devices [ 10 ]. In particular, LaMnO 3 films have been subjected to intensive research as a highly competitive material for information storage since the discovery of the colossal magnetoresistance effect [ 11 , 12 , 13 , 14 ].…”