Abstract
We describe a graphene and fibrous multiwall carbon nanotubes (f-MWCNT) composite film prepared by plasma-enhanced chemical vapor deposition for use as a suitable and possible candidate of hydrogen storage materials. A high storage capacity of 5.53 wt% has been obtained with improved kinetics. The addition of binary PdMg alloy nanoparticles to the surface of graphene-fibrous nanotubes composite films raised the storage capacity by 53% compared to the film without PdMg decorated nanoparticles. Additionally, the graphene/f-MWCNT composite film decorated with PdMg nanoparticles exhibited an enhanced hydrogen absorption–desorption kinetics. The fibrous structure of the MWCNTs, alongside graphene sheets within the film, creates an enormous active region site for hydrogen reaction. The addition of PdMg nanoparticles enhanced the reaction kinetics due to the catalytic nature of Pd, and increased the hydrogen content due to the high absorption capacity of Mg nanoparticles. The combination of Pd and Mg in a binary alloy nanoparticle enhanced the hydrogen capacity and absorption–desorption kinetics.
Highlights
Today, hydrogen is considered the next-generation energy carrier for vehicles and fixed engines or power sources [1–5]
Inspired by the above facts, we have investigated light metal hydrides combined with a carbon-based nanostructure to obtain an excellent hydrogen storage material to assist future clean energy
This work investigates the hydrogen storage capacity of graphene/multiwall carbon nanotubes decorated with PdMg alloy nanoparticles (G/f -MWCNT@PdMg)
Summary
Hydrogen is considered the next-generation energy carrier for vehicles and fixed engines or power sources [1–5]. Hydrogen exhibits the highest energy density per mass of around 40 kWhkg−1. Before hydrogen can be used in portable applications, it is necessary to find the appropriate technology that is most economical and safe to store hydrogen at the highest possible density. There are currently some different hydrogen storage technologies that are heavily investigated [6–13]. All those technologies did not reach the satisfaction conditions for being commercialized. There is a strong demand for innovative technology or new materials that exhibit distinctive and unique properties for hydrogen storage
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