Lithiation induced porous Pd nanoparticle/3D Graphene aerogel composite for highly reversible hydrogen storage based on spillover process
The present disclosure relates to a composite for hydrogen storage formed through lithiation and a method of preparing the same.
1 . A composite for hydrogen storage, comprising:
a nitrogen-doped graphene aerogel; and
a porous metal nanoparticle formed on a surface of the nitrogen-doped graphene aerogel,
wherein the nitrogen-doped graphene aerogel is composed of a reduced graphene oxide single layer, and
wherein the nitrogen-doped graphene aerogel and the porous metal nanoparticle have pores.
2 . The composite of claim 1 ,
wherein the porous metal nanoparticle is Pd, Pt, Ni, or Co.
3 . The composite of claim 1 ,
wherein the porous metal nanoparticle becomes porous through an oxidation process and a lithiation; and lithium removal process.
4 . The composite of claim 1 ,
wherein a size of the porous metal nanoparticle is 10 nm to 200 nm.
5 . The composite of claim 1 ,
wherein a size of the pore of the porous metal nanoparticle is 1 nm to 10 nm.
6 . The composite of claim 1 ,
wherein hydrogen spillover occurs when hydrogen molecules adsorbed to the porous metal nanoparticle are dissociated to hydrogen atoms and the hydrogen atoms migrate to the nitrogen-doped graphene aerogel.
7 . The composite of claim 1 ,
wherein a hydrogen capacity of the composite for hydrogen storage is 5 wt % to 10 wt %.
8 . The composite of claim 1 ,
wherein a hydrogen adsorption activation energy of the composite for hydrogen storage is 15 kJ·mol-1 to 20 kJ·mol-1.
9 . A method of preparing a composite for hydrogen storage, comprising:
oxidizing a nitrogen-doped graphene aerogel-metal nanoparticle composite; and
forming pores by performing a lithiation process and a lithium removal process to the oxidized nitrogen-doped graphene aerogel-metal nanoparticle composite to obtain the composite for hydrogen storage according to claim 1 .
10 . The method of claim 9 ,
wherein the metal nanoparticle is Pd, Pt, Ni, or Co.
11 . The method of claim 9 ,
wherein the nitrogen-doped graphene aerogel-metal nanoparticle composite is formed by growing the metal nanoparticle on a nitrogen-doped graphene aerogel.
12 . The method of claim 9 ,
wherein the lithiation process is electrochemically performed.
13 . The method of claim 9 ,
wherein the lithium removal process is performed by washing the nitrogen-doped graphene aerogel-metal nanoparticle composite after the lithiation process.
14 . A hydrogen carrier comprising the composite for hydrogen storage according to claim 1 .