Abstract
This study investigates the effects of varying the spiked iron content of iron/carbon nanopowder (Fe/CNP) composite materials on hydrogen storage capacity. Among four such samples, a maximum hydrogen uptake of approximately 0.48 wt% was obtained with 14 wt% of spiked iron under 37 atm and 300 K. This higher hydrogen uptake capacity was believed to be closely related to the physisorption mechanism rather than chemisorption. In this case, the formation of maghemite catalyzed the attraction of hydrogen molecules and the CNP skeleton was the principal absorbent material for hydrogen storage. However, as the iron content exceeded 14 wt%, the formation of larger and poorly dispersed maghemite grains reduced the available surface areas of CNP for the storage of hydrogen molecules, leading to decreased uptake. Our study shows that hydrogen uptake capacities can be improved by appropriately adjusting the surface polarities of the CNP with well dispersed iron oxides crystals.
Highlights
Hydrogen-based energy is an irreplaceable component in the inventory of future energy sources
In the case of 7Fe/carbon nanopowders (CNPs) (7 wt%) samples that exhibit the largest specific surface area, their mild hydrogen uptake capacity might be attributed to the lack of sufficient quantities of maghemite clusters embedded in the CNP skeleton
We evaluated the hydrogen storage capacity of Fe/carbon nanopowder (Fe/CNP) composite materials spiked with various weight ratios of iron content
Summary
Hydrogen-based energy is an irreplaceable component in the inventory of future energy sources. In order to meet the challenges of hydrogen storage, four different storage methods have been proposed: liquefaction, compression, storage in metal hydrides, and adsorption on certain surfaces [2]. Microporous carbon-bearing materials have been considered for hydrogen storage These materials possess properties that include large specific surface areas [6] and microporous textures [3] that provide a favorable environment for hydrogen storage. These carbonbearing materials adsorb undissociated hydrogen molecules mainly by the van der Waals forces present at their surfaces. We evaluate and discuss the hydrogen storage capacity of these Fe/carbon nanopowder (Fe/CNP) composite materials at 300 K
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
