Hydrogen storage in MgH2-LaNi5 composites prepared by cold rolling under inert atmosphere

Autor(es)

Marquez, Jose J. ^[1] ; Leiva, Daniel R. ^[2] ; Floriano, Ricardo ^[3] ; Soyama, Juliano ^{[2, 4]} ; Silva, Wagner B. ^[1] ; Ishikawa, Tomaz T. ^[2] ; Kiminami, Claudio S. ^[2] ; Botta, Walter J. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Programa Posgrad Ciencia & Engn Mat, Rod Washington Luiz Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Engn Mat, Rod Washington Luiz Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Estadual Campinas, Fac Ciencias Aplicadas, Rua Pedro Zaccaria 1300, BR-13484350 Limeira, SP - Brazil

^[4] Univ Fed ABC, Ave Estados 5001, BR-09210170 Santo Andre - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 43, n. 29, p. 13348-13355, JUL 19 2018.
• Citações Web of Science: 7

Resumo

Mg-AB(5) composites are promising systems for hydrogen storage applications, due to their possibility of hydrogen cycling at relatively low temperatures. Traditionally, these composites are mainly processed by high-energy ball milling (HEBM) techniques employing longer processing times. In this study, cold rolling was applied to prepare MgH2-LaNi5 composites and the hydrogen storage properties were investigated. The materials were processed using a vertical rolling mill under argon atmosphere, leading to a good homogeneity and no contamination at shorter processing times. The mixture of MgH2-1.50 mol.% LaNi5 showed the best hydrogen storage properties at 200 degrees C and 100 degrees C and the lowest desorption temperature even when compared to cold rolled MgH2. The results indicate that the composite MgH2-LaNi5 is transformed into a mixture of three phases MgH2, Mg2NiH4 and LaH3 upon hydrogen absorption/desorption cycles. The synergetic effect among these phases when in appropriate proportion in the sample seems to play a crucial role in the acceleration of hydrogen absorption/desorption kinetics at lower temperatures in comparison to MgH2. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 13/05987-8 - Processamento e caracterização de ligas metálicas amorfas, metaestáveis e nano-estruturadas
• Beneficiário: Claudio Shyinti Kiminami
• Modalidade de apoio: Auxílio à Pesquisa - Temático