| Texto completo | |
| Autor(es): |
Gandara, Meriene
;
de Arruda, Milena Nakagawa
;
Martins, Marta de Jesus Oliveira
;
Rakocevic, Lazar
;
Mladenovic, Dusan
;
Sljukic, Biljana
;
Goncalves, Emerson Sarmento
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | APPLIED MATERIALS TODAY; v. 40, p. 11-pg., 2024-08-01. |
| Resumo | |
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) | |
| Processo FAPESP: | 23/14091-0 - Desenvolvimento e caracterização de supercapacitores e baterias de íons de lítio com novos materiais bidimensionais: Nb-MXenes |
| Beneficiário: | Meriene Gandara |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 23/17245-8 - Colaboração internacional Brasil, Portugal, Sérvia, Estados Unidos: Pesquisa em nanomateriais para aplicação em dispositivos eletroquímicos armazenadores de energia |
| Beneficiário: | Emerson Sarmento Gonçalves |
| Modalidade de apoio: | Auxílio à Pesquisa - Pesquisador Visitante - Internacional |
| Processo FAPESP: | 22/02737-0 - Desenvolvimento de dispositivos supercapacitores a partir de eletrodos de nanomateriais 2D e 3D: grafeno, MXenos e nanoóxidos metálicos |
| Beneficiário: | Emerson Sarmento Gonçalves |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 22/02347-7 - Novas tecnologias para supercapacitores e baterias de íon lítio a partir de MXenos dopados com terras raras |
| Beneficiário: | Meriene Gandara |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |