Thermal Activation of a Copper-Loaded Covalent Organic Framework for Near-Ambient Temperature Hydrogen Storage and Delivery
[1];
[2];
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[4]
- National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Colorado School of Mines, Golden, CO (United States)
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Copper(II) formate is efficiently incorporated into the pores of a 2D imine-based covalent organic framework (COF) via coordination with the phenol and imine groups. The coordinated metal ion is then reduced to Cu(I) with a thermal treatment that evolves CO2. After loading with hydrogen gas, the majority of H2 desorbs from the coordinatively saturated Cu(II) COF at temperatures < -100 degrees C. However, the activated Cu(I) COF retains adsorbed H2 above room temperature. Adsorption/desorption of H2 was highly reversible. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) strongly supports a molecular hydrogen interaction with Cu(I). A Kissinger analysis of variable ramp rate desorption experiments estimates the enthalpy of H2 desorption from Cu(I) at 15 kJ mol-1. The results represent an advance toward practical H2 storage and delivery in a lightweight, stable, and highly versatile material.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office
- Grant/Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1600127
- Report Number(s):
- NREL/JA-5900-74789
- Journal Information:
- ACS Materials Letters, Vol. 2, Issue 3; ISSN 2639-4979
- Publisher:
- ACS PublicationsCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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