Oriented Assembly of Anisotropic Nanosheets into Ultrathin Flowerlike Superstructures for Energy Storage.
basic_science · Level V
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- Record sourced from PubMed, PMID 33543923.
- Also identified by DOI 10.1021/acsnano.0c08088.
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Abstract
The hierarchical ultrathin nanostructures are excellent electrode materials for supercapacitors because of their large surface area and their ability to promote ion and electron transport. Herein, we investigated nine l-amino acids (LAs) as inductive agents to synthesize a series of CoNi-OH/LAs materials for energy storage. With the different amino acids, the assembled CoNi-OH/LAs form a lamellar, flower-shaped, and bulk structure. Among all materials, the ultrathin flowerlike CoNi<sub>2</sub>-OH/l-asparagine (CoNi<sub>2</sub>-OH/l-Asn) exhibits an excellent specific capacity of 405.4 mAh g<sup>-1</sup> (2608 F g<sup>-1</sup>) and a 100% retention rate after 3000 cycles. We also assembled asymmetrical supercapacitor CoNi<sub>2</sub>-OH/l-Asn//N-rGO devices, which demonstrated an energy density of 64.9 Wh kg<sup>-1</sup> at 799.9 W kg<sup>-1</sup> and superlong cycling stability (82.4% at 10 A g<sup>-1</sup>) over 5000 cycles.