Flexible Supercapacitor Electrodes Based on Carbon Cloth-Supported LaMnO3/MnO Nano-Arrays by One-Step Electrodeposition

Abstract

La-based perovskite-type oxide is a new type of supercapacitor electrode material with great potential. In the present study, LaMnO3/MnO (LMO/MnO) nano-arrays supported by carbon cloth are prepared via a simple one-step electrodeposition as flexible supercapacitor electrodes. The structure, deposit morphology of LMO/MnO, and the corresponding electrochemical properties have been investigated in detail. Carbon cloth-supported LMO/MnO electrode exhibits a specific capacitance of 260 F·g−1 at a current density of 0.5 A·g−1 in 0.5 M Na2SO4 aqueous electrolyte solution. The cooperative effects of LMO and MnO, as well as the uniform nano-array morphology contribute to the good electrochemical performance. In addition, a symmetric supercapacitor with a wide voltage window of 2 V is fabricated, showing a high energy density of 28.15 Wh·kg−1 at a power density of 745 W·kg−1. The specific capacitance drops to 65% retention after the first 500 cycles due to the element leaching effect and partial flaking of LMO/MnO, yet remains stable until 5000 cycles. It is the first time that La-based perovskite has been exploited for flexible supercapacitor applications, and further optimization is expected.

Fabrication of reduced graphene oxide/manganese oxide ink for 3D-printing technology on the application of high-performance supercapacitors

“…During charge and discharge, Mn 2? is partially oxidized, and the related pseudo-capacitive charge storage mechanism is therefore similar to that of MnO 2 [25,[27][28][29].…”

Solid-State Ball-Milling of Co3O4 Nano/Microspheres and Carbon Black Endorsed LaMnO3 Perovskite Catalyst for Bifunctional Oxygen Electrocatalysis

“…The Mn 2p 3/2 peak also consists of two other deconvolution peaks at 641.8 and 643.2 eV, which are ascribed to Mn 3+ and Mn 4+ oxidation states. It has been proven that the coexistence of mixed oxidation states (Mn 3+ and Mn 4+ ) of Mn can increase the conductivity and ORR activity of LaMnO 3 perovskite [14,19]. The high ratio of Mn 3+ indicates more oxygen vacancies were presented in our LaMnO 3 @C-Co 3 O 4 composite, which would be helpful for the enhancement of electrocatalytic activities [16].…”

“…However, it suffers a poor OER catalytic activity due to its chemical instability, lack oxygen vacancies, and high charging overpotential [3,15,16]. To further improve the electrochemical performances of the LaMnO 3 , doping or hybridization strategy is necessary to increase the oxygen vacancy concentration and also to adjust the valence of Mn 4+ /Mn 3+ ratio [17][18][19]. In addition, the transition metals, and their metal oxides (e.g., Fe 3 O 4 , Mn 3 O 4 , Co 3 O 4 , etc.)…”

Advanced materials and technologies for supercapacitors used in energy conversion and storage: a review

“…More importantly, research on energy and power densities of perovskite oxides are scanty (Nan et al 2019;Ding et al 2017). Design of La-based perovskite with high density, wide voltage window and high energy capacity for a flexible supercapacitor application was reported in the literature (Ma et al 2019a). Although, the transition metal oxides have relatively poor conductivity and thus poor capacitance.…”