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AssigneeAir Products and Chemicals, Inc.
InventorsGuido Peter Pez, Hansong Cheng, Alan Charles Cooper, Maw Lin Foo
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The disclosure relates to a material for reversibly storing and releasing hydrogen comprising graphite or a graphitic structure, for example, comprising an ordered graphite structure of carbon and nitrogen atoms wherein the interlayer and/or interstitial volume is occupied with at least one intercalated anionic species. While any suitable anionic species can be employed, examples of suitable species are at least one of: F− (fluoride), (C≡C)2− (diacetylide), and (N═C═N)2−. Desirable anionic species typically have a relatively high charge to volume ratio. The disclosure also relates to a material for reversibly storing and releasing hydrogen comprising ordered graphitic structures comprising at least one member selected from the group of graphite, single walled carbon nanotubes, multiwalled carbon nanotubes, graphite nanofibers, carbon nanohorns, and boron nitride. The carbon materials may incorporate substitutional nitrogen atoms in the graphite lattice at a level ranging from about 1 to about 40 atomic percent.
1) A compound comprising a graphitic structure and at least one anion having a volumetric charge density in the range of about 0.14 to about 0.02 electrons/Å3
7). The composition of claim 1 wherein the anion comprises at least one member selected from the group consisting of O2−, NH2−, S2−, OH−, CN2−, NHLi− and C22−.
8). The composition of claim 7 wherein the anion comprises CN22−
9). The composition of claim 7 wherein the anion comprises NH2−
10). The composition of claim 1 wherein the anion comprises at least one member selected from the group consisting of O2−, NH2−, S2−, OH−, CN2−, NHLi−, C22−, CO32−, O2−, and CN.
13). A method for reversibly storing hydrogen comprising:
14). The method of claim 13 wherein anion comprises at least one anion having a volumetric electron density from about 0.1 electron/Å 3 to about 0.018 electron/Å 3.
15). The method of claim 13 wherein the electron density is about from 0.1 electron/Å 3 to about 0.046 electron/Å 3.
16). The method of claim 13 wherein the anion comprises at least one member selected from the group consisting of O2−, NH2−, S2−, F−, OH−, CN22−, NHLi−, C22−, HF2−, CO32−, O2−, CN−, BF4−, SO3F−, AsF6−, and SbF6−.
17). The method of claim 16 wherein the anion comprises F—.
18). The method of claim 13 wherein the graphitic host structure comprises an acceptor type graphite intercalation compound.
19). The method of claim 13 wherein method comprises at least one process selected from the group consisting of pressure-swing, temperature-swing, and combined temperature and pressure swing processes.
20). The method of claim 13 further comprising releasing at least a portion of the hydrogen retained in the material.
21). The method of claim 17 wherein the F— is ionic or semi-ionic.
22). A composition comprising:
Dependencies are inferred from the claim text.