Author Identifier
Quoc Truc Doan: https://orcid.org/0000-0002-1253-7302
Alireza Keshavarz: https://orcid.org/0000-0002-8091-961X
Stefan Iglauer: https://orcid.org/0000-0002-8080-1590
Document Type
Journal Article
Publication Title
International Journal of Hydrogen Energy
Volume
98
First Page
1099
Last Page
1106
Publisher
Elsevier
School
Centre for Sustainable Energy and Resources
RAS ID
77378
Funders
Bear and Brook Consulting / Australian Research Council's Discovery Projects / Australian Government / Government of Western Australia
Grant Number
ARC Number : DP220102907
Abstract
Hydrogen (H2) has been recognized as a promising solution to reduce carbon dioxide (CO2) emissions. H2 is considered a green energy carrier for energy storage, transport, and usage, and it can be produced from renewable energy resources (such as solar, hydropower, and wind energy). However, H2 is a highly diffusive compound compared to other natural gases, raising concerns about the possibility of H2 loss in geo-storage (e.g. in underground geological formations such as depleted oil/gas reservoirs, aquifers or shale formations) or H2 leak via pipelines when blending H2 with natural gas in existing pipeline systems. Thus, understanding H2 diffusion in subsurface formations and pipeline systems is vital. However, despite its importance, only limited data is available to assess the above situations. Therefore, in this study, molecular dynamics simulations were used to predict the self-diffusion coefficients of H2 in water and cushion gases (CH4 and N2) at relevant geothermal conditions (i.e. 300 K–373 K and pressures up to 50 MPa). The findings showed that H2 self-diffusion in methane and nitrogen increases with increasing temperature but decreases with increasing pressure. However, H2 self-diffusion in water increases with increasing temperature but is not impacted by increasing or decreasing pressure. The results also indicated that the rate of H2 self-diffusion in cushion gas is faster than in water, about exceeding two-digit times. Furthermore, the outcomes reported extended or new data on H2 self-diffusion for the binary system of H2–H2O, H2–CH4, and H2–N2. This study is beneficial and contributes to assessing efficiency and safety for executing H2 transportation and underground hydrogen storage (UHS) schemes.
DOI
10.1016/j.ijhydene.2024.12.147
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Comments
Doan, Q. T., Keshavarz, A., Behrenbruch, P., & Iglauer, S. (2025). Hydrogen diffusion into water and cushion gases–Relevance for hydrogen geo-storage. International Journal of Hydrogen Energy, 98, 1099-1106. https://doi.org/10.1016/j.ijhydene.2024.12.147