Hydrogen production using Al-4Mg-1Sn(-1Fe) [wt.%] alloys: Influence of microstructural features and insights for the recycling of Al alloys

Autor(es)

Barros, Andre ; Konno, Camila ; Silva, Cassio ; de Paula, Andrei ; Garcia, Amauri ; Cheung, Noe

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 136, p. 14-pg., 2025-06-10.

Resumo

Currently, using recycled Al alloys has emerged as a promising approach for hydrogen production. However, the presence of Fe, a common impurity, often compromises their hydrogen production performance, representing a shortcoming. In light of this context, this work aims to investigate the hydrogen production with Al-4Mg-1Sn and Al-4Mg-1Sn-1Fe (wt.%) alloys, focusing on the innovative aspect of leveraging the microstructure to enhance the hydrogen production with recycled alloys of practical interest. The results show that the adverse effects of Fe incorporation on hydrogen production can be mitigated through microstructural refinement. Novel Hall-Petch-type equations describe the improvements of 33% in hydrogen production rate (2.2-3.3 mL/g & sdot;min) and 23% in yield (78%-96%), achieved as the primary dendrite arm spacing of the Fe-containing alloy reduces. Even in the presence of Fe-rich particles, the dealloying of Mg2Sn particles remains fundamental to microgalvanic effects, promoting faster hydrogen production in finer microstructures. (AU)

• Processo FAPESP: 23/12535-8 - Geração de Hidrogênio a partir de Ligas Al-Mg-Fe-Sn: Uma Estratégia de Reciclagem com Ênfase na Microestrutura
• Beneficiário: Andre dos Santos Barros
• Modalidade de apoio: Bolsas no Brasil - Programa Fixação de Jovens Doutores
• Processo FAPESP: 21/11439-0 - Inter-relações entre parâmetros térmicos/microestruturas de solidificação com resistência ao desgaste e geração de hidrogênio de ligas Al-Sn-(Mg;Zn)
• Beneficiário: Noe Cheung
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 23/01422-8 - Geração de hidrogênio a partir de ligas Al-Mg-Fe-Sn: uma estratégia de reciclagem com ênfase na microestrutura
• Beneficiário: Noe Cheung
• Modalidade de apoio: Auxílio à Pesquisa - Regular