1. Flower-like lamellar SmMn2O5 nanosheets with electrochemical properties for the application in supercapacitor electrodes.
- Author
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Zhang, Yun-long, Wang, Xue-wei, Ma, Ke, Wen, Xiao-ran, and Chen, You-lin
- Subjects
SUPERCAPACITOR electrodes ,NANOSTRUCTURED materials ,SUPERCAPACITORS ,FOREIGN exchange rates ,SURFACE area ,ELECTRIC capacity - Abstract
Reasonable design of electrode materials with excellent capacitance performance is essential for the construction of high-energy–density supercapacitors. In this work, we synthesized three SmMn
2 O5 nanocrystals with different morphologies through a simple one-step hydrothermal method, which are SmMn2 O5 -NSs, SmMn2 O5 -NRs, and SmMn2 O5 -NPs. Compared with SmMn2 O5 -NPs and SmMn2 O5 -NRs, SmMn2 O5 -NSs exhibit excellent electrochemical performance of capacitors. At a scanning speed of 1 mV s−1 , the specific capacity of the SmMn2 O5 -NSs reaches 334.25 F g−1 , which is much higher than the 52 F g−1 and 42.84 F g−1 of SmMn2 O5 -NRs and SmMn2 O5 -NPs, respectively. Meanwhile, SmMn2 O5 -NSs have a higher specific surface area and more octahedral Mn4+ . The specific surface area increases the exchange rate of ions and protons between the material and the electrolyte, and more Mn4+ can provide more Mn–O bonds during the reaction. These results indicate that controlling the morphology of SmMn2 O5 nanocrystals by changing hydrothermal reaction conditions is an effective way to construct high-performance supercapacitors. [ABSTRACT FROM AUTHOR]- Published
- 2023
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