An International Laboratory Comparison Study of Volumetric and Gravimetric Hydrogen Adsorption Measurements

• Published in: Chemphyschem Vol. 20; no. 15; pp. 1997 - 2009
• Main Authors: Hurst, Katherine E., Gennett, Thomas, Adams, Jesse, Allendorf, Mark D., Balderas‐Xicohténcatl, Rafael, Bielewski, Marek, Edwards, Bryce, Espinal, L., Fultz, Brent, Hirscher, Michael, Hudson, M. Sterlin L., Hulvey, Zeric, Latroche, Michel, Liu, Di‐Jia, Kapelewski, Matthew, Napolitano, Emilio, Perry, Zachary T., Purewal, Justin, Stavila, Vitalie, Veenstra, Mike, White, James L., Yuan, Yuping, Zhou, Hong‐Cai, Zlotea, Claudia, Parilla, Philip
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 05.08.2019; Wiley-VCH Verlag; ChemPubSoc Europe
• Subjects: Amorphous materials; Chemical Sciences; comparative measurement study; excess capacity; Gravimetry; Hydrogen storage; hydrogen storage measurement; Laboratories; Material chemistry; Reproducibility; volumetric capacity; comparative measurement study; excess capacity; hydrogen storage measurement; volumetric capacity
• ISSN: 1439-4235; 1439-7641
• DOI: 10.1002/cphc.201900166

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. Storage potential: To determine a material's hydrogen storage potential, capacity measurements must be robust, reproducible and accurate. Commonly, reports focus on gravimetric capacity, and often neglect the volumetric capacity. This is the first study to compare measurement reproducibility for excess and total volumetric hydrogen sorption capacities based on the packing volume. The results show good agreement for excess gravimetric capacities and irreproducibility for excess and total volumetric capacities that is attributed to differences in the measured packing volume of the material.