{"title":"Development of Ti–V–Cr–Mn–Mo–Ce high-entropy alloys for high-density hydrogen storage in water bath environments","authors":"Hua-Zhou Hu, Hou-Qun Xiao, Xin-Cong He, Wen-Hao Zhou, Xiao-Xuan Zhang, Rui-Zhu Tang, Jie Li, Chuan-Ming Ma, Qing-Jun Chen","doi":"10.1007/s12598-024-02618-8","DOIUrl":null,"url":null,"abstract":"<p>The V-based body-centered cubic (BCC)-type hydrogen storage alloys have attracted significant attention due to their high theoretical hydrogen storage capacity of 3.80 wt%. However, their practical application faces challenges related to low dehydriding capacity and poor activation performance. To overcome these challenges, a BCC-type Ti–V–Cr–Mn–Mo–Ce high-entropy alloy (HEA) with an effectively dehydriding capacity of 2.5 wt% above 0.1 MPa was prepared. By introduction of Mo and conducting heat treatment, the precipitation of Ti-rich phase in HEA was successfully suppressed, resulting in improved compositional uniformity and dehydriding capacity. Consequently, the effective dehydriding capacity increased significantly from 0.60 wt% to 2.50 wt% at 65 °C, surpassing that of other types of hydrogen storage alloys under the same conditions. Moreover, the addition of 1 wt% Ce enabled initial hydrogen absorption at 25 °C without the need for activation at 400 °C. Furthermore, Ce doping reduced the dehydriding activation energy of the Ti–V–Cr–Mn–Mo–Ce HEA from 52.71 to 42.82 kJ·mol<sup>−1</sup>. Additionally, the enthalpy value of dehydrogenation decreased from 46.89 to 17.96 kJ·mol<sup>−1</sup>, attributed to a decrease in the hysteresis factor from 0.68 to 0.52. These findings provide valuable insights for optimizing the hydrogen storage property of HEA.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\n","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":null,"pages":null},"PeriodicalIF":9.6000,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rare Metals","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s12598-024-02618-8","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The V-based body-centered cubic (BCC)-type hydrogen storage alloys have attracted significant attention due to their high theoretical hydrogen storage capacity of 3.80 wt%. However, their practical application faces challenges related to low dehydriding capacity and poor activation performance. To overcome these challenges, a BCC-type Ti–V–Cr–Mn–Mo–Ce high-entropy alloy (HEA) with an effectively dehydriding capacity of 2.5 wt% above 0.1 MPa was prepared. By introduction of Mo and conducting heat treatment, the precipitation of Ti-rich phase in HEA was successfully suppressed, resulting in improved compositional uniformity and dehydriding capacity. Consequently, the effective dehydriding capacity increased significantly from 0.60 wt% to 2.50 wt% at 65 °C, surpassing that of other types of hydrogen storage alloys under the same conditions. Moreover, the addition of 1 wt% Ce enabled initial hydrogen absorption at 25 °C without the need for activation at 400 °C. Furthermore, Ce doping reduced the dehydriding activation energy of the Ti–V–Cr–Mn–Mo–Ce HEA from 52.71 to 42.82 kJ·mol−1. Additionally, the enthalpy value of dehydrogenation decreased from 46.89 to 17.96 kJ·mol−1, attributed to a decrease in the hysteresis factor from 0.68 to 0.52. These findings provide valuable insights for optimizing the hydrogen storage property of HEA.
期刊介绍:
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.