| Full text | |
| Author(s): Show less - |
Ribeiro, Geyse A. C.
;
de Lima, Scarllett L. S.
;
Santos, Karolinne E. R.
;
Mendonca, Jhonatam P.
;
Macena, Pedro
;
Pessanha, Emanuel C.
;
Cordeiro, Thallis C.
;
Gardener, Jules
;
Solorzano, Guilhermo
;
Fonsaca, Jessica E. S.
;
Domingues, Sergio H.
;
dos Santos, Clenilton C.
;
Dourado, Andre H. B.
;
Tanaka, Auro A.
;
da Silva, Anderson G. M.
;
Garcia, Marco A. S.
Total Authors: 16
|
| Document type: | Journal article |
| Source: | DISCOVER NANO; v. 18, n. 1, p. 16-pg., 2023-12-04. |
| 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 alpha-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. (AU) | |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |