| Autor: |
Geyse A. C. Ribeiro, Scarllett L. S. de Lima, Karolinne E. R. Santos, Jhonatam P. Mendonça, Pedro Macena, Emanuel C. Pessanha, Thallis C. Cordeiro, Jules Gardener, Guilhermo Solórzano, Jéssica E. S. Fonsaca, Sergio H. Domingues, Clenilton C. dos Santos, André H. B. Dourado, Auro A. Tanaka, Anderson G. M. da Silva, Marco A. S. Garcia |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Discover Nano, Vol 18, Iss 1, Pp 1-16 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2731-9229 |
| DOI: |
10.1186/s11671-023-03933-2 |
| Popis: |
Abstract MnOx-based nanomaterials are promising large-scale electrochemical energy storage devices due to their high specific capacity, low toxicity, and low cost. However, their slow diffusion kinetics is still challenging, restricting practical applications. Here, a one-pot and straightforward method was reported to produce Zn-doped MnOx nanowires with abundant defects and tunable small cross-sections, exhibiting an outstanding specific capacitance. More specifically, based on a facile hydrothermal strategy, zinc sites could be uniformly dispersed in the α-MnOx nanowires structure as a function of composition (0.3, 2.1, 4.3, and 7.6 wt.% Zn). Such a process avoided the formation of different crystalline phases during the synthesis. The reproducible method afforded uniform nanowires, in which the size of cross-sections decreased with the increase of Zn composition. Surprisingly, we found a volcano-type relationship between the storage performance and the Zn loading. In this case, we demonstrated that the highest performance material could be achieved by incorporating 2.1 wt.% Zn, exhibiting a remarkable specific capacitance of 1082.2 F.g−1 at a charge/discharge current density of 1.0 A g−1 in a 2.0 mol L−1 KOH electrolyte. The optimized material also afforded improved results for hybrid supercapacitors. Thus, the results presented herein shed new insights into preparing defective and controlled nanomaterials by a simple one-step method for energy storage applications. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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