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A robust volumetric apparatus and method for measuring high pressure hydrogen storage properties of nanostructured materials
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10.1063/1.2937820
/content/aip/journal/rsi/79/6/10.1063/1.2937820
http://aip.metastore.ingenta.com/content/aip/journal/rsi/79/6/10.1063/1.2937820

Figures

Image of FIG. 1.
FIG. 1.

High pressure volumetric apparatus for measurement of hydrogen adsorption capacity and kinetics (abbreviations: FI, flow indicator; PI, pressure indicator; PT, pressure transmitter; TC, thermocouple; , reference volume; , sample cell volume; VSL, vented to safe location).

Image of FIG. 2.
FIG. 2.

Low range accuracy of pressure transmitter.

Image of FIG. 3.
FIG. 3.

Parameters for extension of Sircar’s method of estimating helium adsorption by Henry’s law.

Image of FIG. 4.
FIG. 4.

Reproducibility of AX-21 adsorption and desorption isotherms at for various pressure steps (◻) , (△) , and (○) . Filled markers represent desorption. GX-31 data from Ref. 18.

Image of FIG. 5.
FIG. 5.

Comparison of hydrogen adsorption data from high pressure volumetric system and Micromeritics® ASAP 2010 at .

Image of FIG. 6.
FIG. 6.

Hydrogen adsorption and desorption isotherms for at . Filled markers represent desorption. Curves are from Refs. 62 and 63.

Image of FIG. 7.
FIG. 7.

Hydrogen adsorption and desorption isotherms for graphite at . Filled markers represent desorption.

Image of FIG. 8.
FIG. 8.

Hydrogen adsorption and desorption isotherm for molecular sieve 5A at . Filled markers represent desorption. Inset: comparison of Ref. 66 For .

Image of FIG. 9.
FIG. 9.

Hydrogen adsorption and desorption isotherm for SWNT at . Filled markers represent desorption.

Image of FIG. 10.
FIG. 10.

Effect of omitting helium adsorption during free space measurement at . Data for AX-21 as in Fig. 4.

Image of FIG. 11.
FIG. 11.

Pressure and temperature response to illustrate mole count stability for adsorption step.

Image of FIG. 12.
FIG. 12.

Kinetics of hydrogen adsorption on AX-21 at for (△) , (◻) , and (○) . Inset: estimate of diffusion time constant as a function of pressure.

Image of FIG. 13.
FIG. 13.

Hydrogen capacity for templated carbon spillover receptor with (○) or (◻) platinum particles as spillover source. Physisorption on plain templated carbon (△) is shown for comparison.

Image of FIG. 14.
FIG. 14.

Kinetics for hydrogen spillover on Pt on TC at for (◻) , (△) , and (○) . Inset: estimated diffusion time constant as a function of pressure.

Tables

Generic image for table
Table I.

Henry’s law constants for microporous adsorbents at

Generic image for table
Table II.

Uncertainty in measured variables for the high pressure adsorption apparatus.

Generic image for table
Table III.

Materials studied to demonstrate instrument accuracy.

Generic image for table
Table IV.

Variation of the amount adsorbed for manifold temperature fluctuation. Note: Valve opened at (i.e., first data point is into adsorption event).

Generic image for table
Table V.

Values of the diffusion time constant for AX-21.

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/content/aip/journal/rsi/79/6/10.1063/1.2937820
2008-06-16
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A robust volumetric apparatus and method for measuring high pressure hydrogen storage properties of nanostructured materials
http://aip.metastore.ingenta.com/content/aip/journal/rsi/79/6/10.1063/1.2937820
10.1063/1.2937820
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