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Hydrogen Adsorption and Isotope Mixing on Copper-Functionalized Activated Carbons

Quine, Cullen M. and Smith, Hillary L. and Ahn, Channing C. and Hasse-Zamudio, Ariel and Boyd, David A. and Fultz, Brent (2022) Hydrogen Adsorption and Isotope Mixing on Copper-Functionalized Activated Carbons. Journal of Physical Chemistry C, 126 (39). pp. 16579-16586. ISSN 1932-7447. doi:10.1021/acs.jpcc.2c02960.

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High-specific surface area (SSA) carbons were functionalized with copper nanoclusters and evaluated as potential hydrogen storage materials. The adsorption and desorption behaviors of the copper-functionalized material and pristine high-SSA carbon are compared between 77 and 400 K using adsorption isotherms up to 10 MPa and by temperature-programmed desorption of isotopic hydrogen. The high-SSA activated carbon with copper nanoclusters exhibited two desorption behaviors. (1) A desorption peak at 120 K, which was associated with physisorption on carbon, and (2) a desorption peak at 310 K, which was associated with a chemisorption process involving copper. The desorption from copper was strongly dependent on the hydrogen pressure used for loading, and dissociation of the hydrogen could be avoided by loading at low temperature and pressure. An enhancement of hydrogen uptake in the low-coverage (Henry’s law) regime at ambient temperatures with copper nanoclusters was observed, demonstrating an increased adsorption enthalpy with the copper-modified material. Binding site energies of 6 and 20 kJ/mol for H2 physisorption and H chemisorption, respectively, were obtained from fits to isotherms.

Item Type:Article
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URLURL TypeDescription
Quine, Cullen M.0000-0002-7301-0969
Smith, Hillary L.0000-0001-6155-7812
Fultz, Brent0000-0002-6364-8782
Additional Information:This project was supported by the Department of Energy Office of Energy Efficiency and Renewable Energy, through DE-EE0007048. The authors thank the Pacific Northwest National Laboratory (PNNL) for microscopy characterization, Nicholas Weadock for his help with sample preparation, SEM images, and experimental setup, and Sammy Shaker and Dr. Julia Greer for TGA characterization.
Funding AgencyGrant Number
Department of Energy (DOE)DE-EE0007048
Issue or Number:39
Record Number:CaltechAUTHORS:20221010-454096500.21
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117305
Deposited By: Research Services Depository
Deposited On:13 Oct 2022 00:00
Last Modified:13 Oct 2022 00:00

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