Indigo as a Low-Cost Redox-Active Sorbent for Electrochemically Mediated Carbon Capture

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Krish N. Jayarapu
  • Anmol Mathur
  • Andong Liu
  • Lingyu Zhang
  • Jaeeun Kim
  • Hyunah Kim
  • Su Keun Kuk
  • Yayuan Liu

Detail(s)

Original languageEnglish
Article number2402355
Journal / PublicationAdvanced Functional Materials
Publication statusOnline published - 13 May 2024
Externally publishedYes

Abstract

Climate change has driven the need for carbon capture to mitigate anthropogenic greenhouse gas emissions, yet current thermochemical methods are hampered by high energy intensities. Electrochemically mediated carbon capture (EMCC) utilizing redox-active carbon dioxide (CO2) carriers is an attractive alternative for carbon capture. Here, an economical vat dye compound, indigo, is presented, which can reversibly capture and release CO2 upon electrochemical reduction and oxidation, respectively. Electrode and electrolyte engineering strategies are utilized to improve the reversibility and stability of indigo for EMCC. A bench-scale prototypical fixed-bed carbon capture device is constructed to demonstrate indigo's EMCC performance under various practically relevant conditions, such as simulated flue gas and extremely dilute sources pertinent to direct air capture. A hybrid sorbent electrode-gas diffusion layer approach is revealed to alleviate CO2 mass transport limitations, achieving ≈80% CO2 capacity utilization under a 15% CO2 feed stream. Furthermore, a reactive-diffusive mass transport model is developed to illustrate engineering approaches that can be universally applied to optimize fixed-bed EMCC systems. This work advances the potential for a class of low-cost sorbents for EMCC while underscoring the importance of molecular, electrolyte, materials, and device engineering strategies to enable high-performance carbon capture. © 2024 Wiley-VCH GmbH.

Research Area(s)

  • carbon capture, device engineering, electrochemical separations, organic electrodes, transport modeling

Citation Format(s)

Indigo as a Low-Cost Redox-Active Sorbent for Electrochemically Mediated Carbon Capture. / Jayarapu, Krish N.; Mathur, Anmol; Li, Xing et al.
In: Advanced Functional Materials, 13.05.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review