| Institution: | 1. National Renewable Energy Laboratory, Golden, CO 80401;2. National Renewable Energy Laboratory, Golden, CO 80401
Colorado School of Mines, Golden, CO 80401;3. US Department of Energy, Fuel Cells and Technology Office, Golden, CO 80401 USA;4. Sandia National Laboratory, Livermore, CA 94551 USA;5. Max Planck Institute for Intellegent Systems, 70569 Stuttgart, Germany;6. European Commission of Joint Research Centre, Petten, Netherlands;7. California Institute of Technology, Pasadena, CA 91125 USA;8. National Institute of Standards and Technology, Gaithersburg, MD 20899 USA;9. Fuel Cell Technology Office, U.S. Department of Energy, Washington D.C., 20585 USA;10. Université Paris Est. ICMPE, CNRS, F-94320 Thiais, France;11. Argonne National Laboratory, Lemont, IL 60439 USA;12. University of California Berkeley, Berkeley, CA 94720 USA;13. Texas A&M University College Station, TX 77842 USA;14. Ford Motor Company, Dearborn, MI 48109 USA |
| Abstract: | In order to determine a material's hydrogen storage potential, capacity measurements must be robust, reproducible, and accurate. Commonly, research reports focus on the gravimetric capacity, and often times the volumetric capacity is not reported. Determining volumetric capacities is not as straight-forward, especially for amorphous materials. This is the first study to compare measurement reproducibility across laboratories for excess and total volumetric hydrogen sorption capacities based on the packing volume. The use of consistent measurement protocols, common analysis, and figure of merits for reporting data in this study, enable the comparison of the results for two different materials. Importantly, the results show good agreement for excess gravimetric capacities amongst the laboratories. Irreproducibility for excess and total volumetric capacities is attributed to real differences in the measured packing volume of the material. |
