| Texto completo | |
| Autor(es): |
Andrade, Gaspar
;
Huot, Jacques
;
Floriano, Ricardo
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Materials Chemistry and Physics; v. 343, p. 10-pg., 2025-10-01. |
| Resumo | |
High-entropy alloys (HEAs), particularly those with body-centered cubic (BCC) and C14-laves structures, have gained attention for their tunable hydrogen storage properties. This study investigates the TiZrHfVNb1-xCux system, focusing on the impact of incremental Nb substitution by Cu (x = 0.6, 0.8, and 1.0) on microstructural evolution and hydrogen absorption behavior. The introduction of Cu leads to phase segregation, with V enrichment in dendrites and Zr/Hf accumulation in interdendritic regions, promoting a mixed BCC and C14 Laves phase structure. The increase in Cu content facilitates the formation of C14 Laves phases because Cu, being a relatively small atom, effectively satisfies the geometrical criterion necessary for the stabilization of this phase when substituting Nb. Initial hydrogenation performed at room temperature reveals that the HEAs achieve a hydrogen storage capacity of 1.4-1.6 wt% with rapid kinetics following thermal activation. Notably, the TiZrHfVCu alloy (x = 1) exhibits reversible hydrogen absorption and desorption near atmospheric pressure, storing 1.5 wt% hydrogen. These findings underscore the TiZrHfVNb1-xCux system's potential for hydrogen storage under accessible temperature and pressure conditions, suggesting a pathway to viable solid-state hydrogen storage applications. (AU) | |
| Processo FAPESP: | 22/03024-7 - Estrutura, processamento e propriedade de ligas multicomponentes avançadas para as aplicações biomédicas e armazenagem de energia |
| Beneficiário: | Ricardo Floriano |
| Modalidade de apoio: | Auxílio à Pesquisa - Projeto Inicial |