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.
Highlights
In recent years, new energy storage devices represented by supercapacitors and lithium-ion batteries have gained significant attention for the sustainable development of resources and environment [1,2,3]
Transition metal oxides/sulfides have attracted public attention on account of their higher special capacitance compared with carbon-based materials as well as preferable cycling stability compared with conducting polymers
For La-based perovskites LaBO3 preparation, the greatest weakness lies in the nonparticipation of La ions in any redox process reaction during the reaction
Summary
New energy storage devices represented by supercapacitors and lithium-ion batteries have gained significant attention for the sustainable development of resources and environment [1,2,3]. Supercapacitors are identified as the bridge between lithium-ion batteries and conventional dielectric capacitors [4]. Carbon-based materials, conducting polymers, and transition metal oxides/sulfides have been extensively researched as electrode materials for supercapacitor [2,7]. Transition metal oxides/sulfides have attracted public attention on account of their higher special capacitance compared with carbon-based materials as well as preferable cycling stability compared with conducting polymers. It is significant to develop a new type of material that can intrinsically optimize the electrochemical parameters
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