Thermal Activation of a Copper-Loaded Covalent Organic Framework for Near-Ambient Temperature Hydrogen Storage and Delivery

Wade Braunecker, Sarah Shulda, Katherine Hurst, Thomas Gennett, Justin Johnson, Rachel Mow, Svitlana Pylypenko, Alan Sellinger, Joshua Koubek, Sarah Zaccarine, Madison Martinez

Research output: Contribution to journalArticlepeer-review

24 Scopus Citations

Abstract

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.
Original languageAmerican English
Pages (from-to)227-232
Number of pages6
JournalACS Energy Letters
Volume2
Issue number3
DOIs
StatePublished - 2020

NREL Publication Number

  • NREL/JA-5900-74789

Keywords

  • covalent organic frameworks
  • desorption
  • enthalpy
  • materials
  • metals

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