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Ribeiro GAC, de Lima SLS, Santos KER, Mendonça JP, Macena P, Pessanha EC, Cordeiro TC, Gardener J, Solórzano G, Fonsaca JES, Domingues SH, Dos Santos CC, Dourado AHB, Tanaka AA, da Silva AGM, Garcia MAS. Zn-doped MnO x nanowires displaying plentiful crystalline defects and tunable small cross-sections for an optimized volcano-type performance towards supercapacitors. DISCOVER NANO 2023; 18:147. [PMID: 38047970 PMCID: PMC10695906 DOI: 10.1186/s11671-023-03933-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Accepted: 11/28/2023] [Indexed: 12/05/2023]
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.
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Affiliation(s)
- Geyse A C Ribeiro
- Departamento de Química, Centro de Ciências Exatas E Tecnologia, Universidade Federal Do Maranhão (UFMA), São Luís, MA, Brazil
| | - Scarllett L S de Lima
- Departamento de Engenharia Química E de Materiais-DEQM, Pontifícia Universidade Católica Do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, Brazil
| | - Karolinne E R Santos
- Departamento de Química, Centro de Ciências Exatas E Tecnologia, Universidade Federal Do Maranhão (UFMA), São Luís, MA, Brazil
| | - Jhonatam P Mendonça
- Departamento de Química, Centro de Ciências Exatas E Tecnologia, Universidade Federal Do Maranhão (UFMA), São Luís, MA, Brazil
| | - Pedro Macena
- Departamento de Engenharia Química E de Materiais-DEQM, Pontifícia Universidade Católica Do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, Brazil
| | - Emanuel C Pessanha
- Departamento de Engenharia Química E de Materiais-DEQM, Pontifícia Universidade Católica Do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, Brazil
| | - Thallis C Cordeiro
- Centro de Ciências Exatas E Tecnologia, Universidade Estadual Do Norte Fluminense Darcy Ribeiro (UENF), Rio de Janeiro, RJ, Brazil
| | - Jules Gardener
- Center for Nanoscale Systems, School of Engineering and Applied Sciences, Harvard University, Cambridge, USA
| | - Guilhermo Solórzano
- Departamento de Engenharia Química E de Materiais-DEQM, Pontifícia Universidade Católica Do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, Brazil
| | - Jéssica E S Fonsaca
- Mackenzie Institute for Advanced Research in Graphene and Nanotechnologies - MackGraphe, Mackenzie Presbyterian University, São Paulo, SP, Brazil
| | - Sergio H Domingues
- Mackenzie Institute for Advanced Research in Graphene and Nanotechnologies - MackGraphe, Mackenzie Presbyterian University, São Paulo, SP, Brazil
| | | | - André H B Dourado
- São Carlos Institute of Chemistry, Universidade de São Paulo (USP), São Carlos, SP, Brazil
| | - Auro A Tanaka
- Departamento de Química, Centro de Ciências Exatas E Tecnologia, Universidade Federal Do Maranhão (UFMA), São Luís, MA, Brazil
| | - Anderson G M da Silva
- Departamento de Engenharia Química E de Materiais-DEQM, Pontifícia Universidade Católica Do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, Brazil.
| | - Marco A S Garcia
- Departamento de Química, Centro de Ciências Exatas E Tecnologia, Universidade Federal Do Maranhão (UFMA), São Luís, MA, Brazil.
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