Abstract
NiMnO3 nanosheets with high specific capacitance were fabricated on carbon cloth (CC) substrates using a facile hydrothermal method. The composition, morphology, and structure of the products were characterized using x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. In addition, cyclic voltammetry and constant current charge–discharge tests revealed that NiMnO3@CC electrodes presented excellent capacitive properties, and the specific capacitance reached 2330 F/g at the current density of 1 A/g. Moreover, after 1000 charge–discharge cycles at the current density of 10 A/g, the composites still maintained 67.8% of their initial capacity. Our results indicated that the NiMnO3@CC electrodes presented good electrochemical properties with potential application in the energy storage field.
Highlights
Supercapacitors, known as electrochemical capacitors, are a new type of energy storage devices that were developed in the 1980s
0.09 g CO(NH2)2 and 0.21 g (CH2)6N4 were added to the above solution, and the mixture was stirred for 30 min to form a clear mixed solution, which was subsequently added to a 50 ml polytetrafluoroethylene-lined reaction kettle
All the ultrathin NiMnO3 nanosheets prepared in this study were conducive to the construction of a highly porous nanostructure, which was very beneficial for avoiding the agglomeration of active materials and increasing the contact area for the solid–liquid reaction
Summary
Supercapacitors, known as electrochemical capacitors, are a new type of energy storage devices that were developed in the 1980s. Researchers have studied several inexpensive metal oxide/ hydroxide materials, such as NiO, MnO2,7,8 Co3O4,9 Ni(OH) Co(OH) and Fe3O4.12 MnO2 has been considered as one of the most promising electrode materials owing to its affordability, abundance, and high theoretical specific capacitance (1370 F/g). Qu et al. prepared MnO2 nanorods in neutral aqueous electrolytes with the specific capacitance up to 201 F/g as cathodes for asymmetric supercapacitors. These studies have revealed that the low specific capacitance of MnO2 was attributed to its low conductivity, which hindered its application as a potential capacitor with high specific capacitance. We used a simple one-step hydrothermal method to prepare NiMnO3 nanosheets on a carbon cloth (CC) with high specific capacitance. Scitation.org/journal/adv the composition, hydrothermal reaction time, and capacitance of NiMnO3 nanosheets were studied, and the results indicated that the NiMnO3@CC materials are ideal electrode materials for supercapacitors
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