Hydrogen storage properties of new A(3)B(2)-type TiZrNbCrFe high-entropy alloy

Autor(es)

Floriano, Ricardo ^[1] ; Zepon, Guilherme ^{[2, 3]} ; Edalati, Kaveh ^[4] ; Fontana, Gabriel L. B. G. ^[1] ; Mohammadi, Abbas ^[4] ; Ma, Zhongliang ^{[4, 5]} ; Li, Hai-Wen ^{[4, 6]} ; Contieri, Rodrigo J. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas FCA UNICAMP, Sch Appl Sci, Pedro Zaccaria 1300, BR-13484350 Limeira - Brazil

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

^[3] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, Rod Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[4] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, WPI, Fukuoka 8190395 - Japan

^[5] Nanjing Tech Univ, Coll Mat Sci & Engn, 30 South Puzhu, Nanjing 211816 - Peoples R China

^[6] Hefei Gen Machinery Res Inst, Hefei 230031 - Peoples R China

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 46, n. 46, p. 23757-23766, JUL 6 2021.
• Citações Web of Science: 2

Resumo

Crystal structure and hydrogen storage properties of a novel equiatomic TiZrNbCrFe high entropy alloy (HEA) were studied. The selected alloy, which had a A3B2-type configuration (A: elements forming hydride, B: elements with low chemical affinity with hydrogen) was designed to produce a hydride with a hydrogen-to-metal atomic ratio (H/M) higher than those for the AB(2)- and AB-type alloys. The phase stability of alloy was investigated through thermodynamic calculations by the CALPHAD method. The alloy after arc melting showed the dominant presence of a solid solution C14 Laves phase (98.4%) with a minor proportion of a disordered BCC phase (1.6%). Hydrogen storage properties investigated at different temperatures revealed that the alloy was able to reversibly absorb and fully desorb 1.9 wt% of hydrogen at 473 K. During the hydrogenation, the initial C14 and BCC crystal structures were fully converted into the C14 and FCC hydrides, respectively. The H/M value was 1.32 which is higher than the value of 1 reported for the AB(2)- and AB-type HEAs. The present results show that good hydrogen storage capacity and reversibility at moderate temperatures can be attained in HEAs with new configurations such as A(3)B(2)/A(3)B(2)H(7). (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 18/15968-4 - Síntese e Caracterização de Ligas de Alta Entropia do Sistema TiFe
• Beneficiário: Ricardo Floriano
• Modalidade de apoio: Auxílio à Pesquisa - Regular