| Full text | |
| Author(s): |
Gandara, Meriene
;
de Arruda, Milena Nakagawa
;
Martins, Marta de Jesus Oliveira
;
Rakocevic, Lazar
;
Mladenovic, Dusan
;
Sljukic, Biljana
;
Goncalves, Emerson Sarmento
Total Authors: 7
|
| Document type: | Journal article |
| Source: | APPLIED MATERIALS TODAY; v. 40, p. 11-pg., 2024-08-01. |
| Abstract | |
Low-cost non-noble metal electrocatalysts are currently the focus of research and development for energy conversion and storage devices. MXenes, the newest class of two-dimensional materials, have high surface area, nanometer layer thickness, hydrophilicity and high electrical conductivity that favor their performance for electrocatalytic reactions. Herein, niobium carbide MXene (Nb-MXene) was obtained from its MAX phase by chemical synthesis and characterized regarding its morphology, structure and electrochemical activity for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) as well as for charge storage in different electrolytic media. The results demonstrate the good performance of Nb-MXene for storing charge (104 F g(-1) at 5 mV s(-1)) that increased remarkably with continuous cycling in an acidic medium. Current density for oxygen evolution of similar to 32.5 mA cm(-2) was reached in alkaline medium. The oxygen reduction reaction in the same media was observed to proceed via 2e(-) mechanism with a Tafel slope of 114 mV dec(-1). Therefore, Nb-MXene presents characteristics and performance of a promising material for electrocatalytic reactions. (AU) | |
| FAPESP's process: | 23/14091-0 - Development and characterization of supercapacitor and lithium-ion batteries with new two-dimensional materials: Nb-MXenes |
| Grantee: | Meriene Gandara |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 23/17245-8 - International collaboration Brazil, Portugal, Serbia, United States: Research into nanomaterials for application in electrochemical energy storage devices |
| Grantee: | Emerson Sarmento Gonçalves |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - International |
| FAPESP's process: | 22/02737-0 - Development of supercapacitor devices from 2D and 3D nanomaterial electrodes: graphene, MXenes and metal nanooxides |
| Grantee: | Emerson Sarmento Gonçalves |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 22/02347-7 - New technologies for supercapacitors and lithium-ion batteries from rare earth-doped MXenes |
| Grantee: | Meriene Gandara |
| Support Opportunities: | Scholarships in Brazil - Doctorate |