Catalytically Enhanced Hydrogen Sorption in Mg-MgH2 by Coupling Vanadium-Based Catalyst and Carbon Nanotubes

Materials

Atikah Kadri¹  Yi Jia¹  Zhigang Chen¹  Xiangdong Yao² 

[1] Centre of Excellence for Functional Nanomaterials, the University of Queensland, St. Lucia, Brisbane, QLD 4067, Australia; E-Mails:;Queensland Micro- and Nanotechnology Centre (QMNC), Griffith University, Nathan, Brisbane, QLD 4111, Australia

关键词: hydrogen storage;    magnesium hydride;    carbon nanotubes;    vanadium complex catalyst;   

DOI  :  10.3390/ma8063491

来源: mdpi

【 摘 要 】

Mg (MgH₂)-based composites, using carbon nanotubes (CNTs) and pre-synthesized vanadium-based complex (VCat) as the catalysts, were prepared by high-energy ball milling technique. The synergistic effect of coupling CNTs and VCat in MgH₂ was observed for an ultra-fast absorption rate of 6.50 wt. % of hydrogen per minute and 6.50 wt. % of hydrogen release in 10 min at 200 °C and 300 °C, respectively. The temperature programmed desorption (TPD) results reveal that coupling VCat and CNTs reduces both peak and onset temperatures by more than 60 °C and 114 °C, respectively. In addition, the presence of both VCat and CNTs reduces the enthalpy and entropy of desorption of about 7 kJ/mol H₂ and 11 J/mol H₂·K, respectively, as compared to those of the commercial MgH₂, which ascribe to the decrease of desorption temperature. From the study of the effect of CNTs milling time, it is shown that partially destroyed CNTs (shorter milling time) are better to enhance the hydrogen sorption performance.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.