| Full text | |
| Author(s): |
Alexandreli, Murilo
[1]
;
Brocchi, Cesar B.
[1]
;
Soares, Davi Marcelo
[1]
;
Nunes, Willian G.
[1]
;
Freitas, Bruno G.
[1]
;
de Oliveira, Francisca E. R.
[1]
;
Aranha Schiavo, Luiz Eduardo Camargo
[1]
;
Peterlevitz, Alfredo C.
[1]
;
da Silva, Leonardo M.
[2]
;
Zanin, Hudson
[1]
Total Authors: 10
|
| Affiliation: | [1] Univ Estadual Campinas, Ctr Innovat New Energies Mfg Grp, Sch Elect & Comp Engn, Carbon Sci Tech Labs, Adv Energy Storage Div, Av Albert Einstein 400, BR-13083852 Campinas, SP - Brazil
[2] Fed Univ Jequitinhonha & Mucuris Valley, Lab Fundamental & Appl Electrochem, Dept Chem, Rodovia MGT 367, Km 583, 5000 Alto da Jacuba, BR-39100000 Diamantina, MG - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | JOURNAL OF ENERGY STORAGE; v. 42, OCT 2021. |
| Web of Science Citations: | 1 |
| Abstract | |
Due to the pseudocapacitive charge storage, transition metal oxides occupy a prominent position as high-energy-density electrode materials for supercapacitors. Environmentally friendly, facile synthesis and earth-abundant precursor materials are highly desirable in the investigation of novel electrodes. We report the synthesis of a binder-free electrode composed of iron oxide (FeOx) nanoparticles supported on radially oriented multi-walled carbon nanofibers (CNF). Characterization studies revealed a homogeneous distribution of nanoparticles composed of alpha-Fe2O3 (hematite), gamma-Fe2O3 (maghemite), and Fe2O3 (magnetite) phases on the CNF scaffold. A high specific pseudocapacitance of 239.2 F g(-1) was verified for the iron oxides due to contributions of the reversible solid-state redox reactions involving the Fe(II)/Fe(III) redox couple. Likewise, this work also discusses in detail the charge storage mechanism involving the FeOr species. It is reported a facile synthesis of an electrode material with a pseudocapacitive behaviour, good cyclability, and low equivalent series resistance (e.g., 3.79 m Omega g). As seen, the composite electrode material is promising for the energy storage process in aqueous-based supercapacitors. (AU) | |
| FAPESP's process: | 17/11958-1 - CINE - Advanced Energy Storage Division |
| Grantee: | Rubens Maciel Filho |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 14/02163-7 - Development of supercapacitors devices from graphene, carbon nanotubes and diamonds |
| Grantee: | Hudson Giovani Zanin |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 18/20756-6 - Pseudocapacitors from metal oxides and activated carbon composites |
| Grantee: | Willian Gonçalves Nunes |
| Support Opportunities: | Scholarships in Brazil - Doctorate |