Photochemically-Driven CO2 Release Using a Metastable-State Photoacid for Energy Efficient Direct Air Capture

Premadasa, Uvinduni I.; Bocharova, Vera; Miles, Audrey R.; Stamberga, Diana; Belony, Stella; Bryantsev, Vyacheslav S.; Elgattar, Adnan; Liao, Yi; Damron, Joshua T.; Kidder, Michelle K.; Doughty, Benjamin; Custelcean, Radu; Ma, Ying‐Zhong

doi:10.1002/anie.202304957

Title: Photochemically-Driven CO₂ Release Using a Metastable-State Photoacid for Energy Efficient Direct Air Capture

Journal Article · 16 May 2023 · Angewandte Chemie (International Edition)

DOI: https://doi.org/10.1002/anie.202304957 · OSTI ID:1989557

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division; University of Notre Dame, IN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division; Univ. of Florida, Gainesville, FL (United States)
Florida Institute of Technology, Melbourne, FL (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Manufacturing Science Division

One of the grand challenges underlying current direct air capture (DAC) technologies relates to the intensive energy cost for sorbent regeneration and CO₂ release, making the massive scale (GtCO₂/year) deployment required to have a positive impact on climate change economically unfeasible. This challenge underscores the critical need to develop new DAC processes with substantially reduced regeneration energies. Here, in this work, we report a photochemically-driven approach for CO₂ release by exploiting the unique properties of an indazole metastable-state photoacid (mPAH). Our measurements on simulated and amino acid-based DAC systems revealed the potential of mPAH to be used for CO₂ release cycles by regulating pH changes and associated isomers driven by light. Upon irradiating with moderate intensity light, a ≈55 % and ≈68 % to ≈78 % conversion of total inorganic carbon to CO₂ was found for the simulated and amino acid-based DAC systems, respectively. Our results confirm the feasibility of on-demand CO₂ release under ambient conditions using light instead of heat, thereby providing an energy efficient pathway for the regeneration of DAC sorbents.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: AC05-00OR22725; SC0022214

OSTI ID:: 1989557

Journal Information:: Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 29 Vol. 62; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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amino acids
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metastable compounds
photochemistry

Title: Photochemically-Driven CO2 Release Using a Metastable-State Photoacid for Energy Efficient Direct Air Capture

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Title: Photochemically-Driven CO₂ Release Using a Metastable-State Photoacid for Energy Efficient Direct Air Capture