Determining the Hydrogen Adsorption Capacity of Porous Materials

Fuel cells were first conceived in 1838 by Swiss Scientist Christian Schönbein; the first fuel cell was developed by Welsh Scientist Sir William Grove in 1843. The first practical applications of fuel cells came in the 1960s for the U. S. space program. Both energy and water could be generated from two widely available fuels — hydrogen and water. Ongoing environmental concerns and energy research have fuelled renewed interest in hydrogen generation and hydrogen storage as technologies required for clean, portable energy.

Quantifying The Hydrogen Storage Capacity Of New Materials

Quantifying the hydrogen storage capacity of new materials is a key technology for predicting the performance in a fuel cell or hydrogen storage device. The Micromeritics ASAP 2020 is a flexible gas adsorption analyzer capable of measuring the hydrogen adsorption capacity of powders and porous materials.

Software For Hydrogen Researchers

The ASAP 2020 software has been enhanced to address the needs of fuel cell and hydrogen storage Researchers. The following enhancements were introduced in Version 3 of the ASAP 2020 software:

  • Absolute pressure dosing for non-condensing probe molecules like hydrogen.
  • New isotherm reports that include the weight percent of hydrogen adsorbed and the Pressure Composition Isotherm that is frequently used by hydrogen storage Researchers.
  • Calculated Free-space options to reduce analysis time, improve precision, and minimize exposure to interfering gases like helium.

Hydrogen Adsorption

A successful hydrogen adsorption analysis requires proper sample preparation, which is a two-step process. First, samples should be degassed on the preparation port to remove moisture and stray gases like CO2 that sorb strongly to many materials at ambient temperature and pressure. Second, the sample should be degassed thoroughly on the sample port.

The standard ASAP 2020 sample tube (1/2-inch stem) with a seal frit is recommended for this type of analysis. An isothermal jacket is recommended if the analysis is conducted at cryogenic temperatures (liquid nitrogen or liquid argon). A filler rod is optional but not recommended if the analysis is performed at cryogenic temperatures; the filler rod may interfere with the precision of low-pressure measurements.

This information has been sourced, reviewed and adapted from materials provided by Micromeritics Instrument Corporation.

For more information on this source, please visit Micromeritics Instrument Corporation.


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