Hydrogenated Graphite for Solid-State Hydrogen Storage: Evaluation of Bulk Impurities and Post-Synthetic Purification Strategies
Abstract
The major challenge in the application of hydrogen powered fuel cells for military applications, is the safe and effective high-density storage of the hydrogen. To this end, NRL has demonstrated for the first time the large-scale synthesis and characterization of chemically hydrogenated graphite in order to quantify its bulk hydrogen storage capacity and understand its thermal decomposition under relevant operating conditions. Post-synthetic purification strategies were developed to reduce residual alkali-based byproducts persisting from the synthesis of the chemically hydrogenated graphite. Multi-gram quantities of hydrogenated graphite samples were quantitatively analyzed using a high pressure hydrogen generator. Under an evacuated atmosphere at 550 deg C, hydrogenated graphite was found to generate a gas mixture composed of 92 percent H2, which was purified using a commercial carbon filter. The H2 gas generated corresponded to an H2 storage capacity of 4.26 wt. percent .
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 05, 2019
- Accession Number
- AD1079348
Entities
People
- David Zugell
- Heather Willauer
- James R. Morse
- Jeffery W. Baldwin
Organizations
- United States Naval Research Laboratory