Electrochemical Concentration and Separation of Carbon Dioxide For Advanced Life Support Systems—Carbonation Cell System

Huebscher, R. G.; Babinsky, A. D.

doi:10.4271/690640

Cited by 8 publications

(12 citation statements)

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“…Moreover, electrochemical systems, based on electrical power, are more suitable for CO 2 removal from emission points where insufficient waste heat is available for solvent regeneration. Various concepts have been explored, such as Molten carbonate fuel cell, , pH swing with ion-exchange membranes, , electrochemical generation of nucleophile, − and supercapacitive swing adsorption . In this study, we propose an alternative concept to capture CO 2 based on membrane capacitive deionization (MCDI). − …”

Section: Introductionmentioning

confidence: 99%

Solvent-Free CO₂ Capture Using Membrane Capacitive Deionization

Legrand

Schaetzle²,

Kler³

et al. 2018

Environ. Sci. Technol.

104

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Capture of CO, originating from both fossil fuels, such as coal combustion, and from renewables, such as biogas, appears to be one of the greatest technological challenges of this century. In this study, we show that membrane capacitive deionization (MCDI) can be used to capture CO as bicarbonate and carbonate ions produced from the reaction of CO with water. This novel approach allows capturing CO at room temperature and atmospheric pressure without the use of chemicals. In this process, the adsorption and desorption of bicarbonate ions from the deionized water solution drive the CO(g) absorption-desorption from the gas phase. In this work, the effects of the current density and the CO partial pressure were studied. We found that between 55 and 75% of the electrical charge of the capacitive electrodes can be directly used to absorb CO gas. The energy requirement of such a system was found to be ≈40 kJ mol at 15% CO and could be further improved by reducing the ohmic and non-ohmic energy losses of the MCDI cell.

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Section: Introductionmentioning

confidence: 99%

Solvent-Free CO₂ Capture Using Membrane Capacitive Deionization

Legrand

Schaetzle²,

Kler³

et al. 2018

Environ. Sci. Technol.

104

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“…The original motivation of applying electrochemistry to CO 2 separation dates back to the need for removal of carbon dioxide from breathing gas mixtures on manned space flights. − These early efforts were based on molten carbonate fuel cell (MCFC) systems that were reconfigured into molten carbonate CO 2 concentrators (MCCC). Carbon dioxide production by MCFCs is zero due to equal amounts of CO 2 being consumed (eq ) and generated (eq ) at the cathode and anode, respectively (net shown in eq ).…”

mentioning

confidence: 99%

Electrochemical Capture and Release of Carbon Dioxide

et al. 2017

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Understanding the chemistry of carbon dioxide is key to affecting changes in atmospheric concentrations. One area of intense interest is CO2 capture in chemically reversible cycles relevant to carbon capture technologies. Most CO2 capture methods involve thermal cycles in which a nucleophilic agent captures CO2 from impure gas streams (e.g., flue gas), followed by a thermal process in which pure CO2 is released. Several reviews have detailed progress in these approaches. A less explored strategy uses electrochemical cycles to capture CO2 and release it in pure form. These cycles typically rely on electrochemical generation of nucleophiles that attack CO2 at the electrophilic carbon atom, forming a CO2 adduct. Then, CO2 is released in pure form via a subsequent electrochemical step. In this Perspective, we describe electrochemical cycles for CO2 capture and release, emphasizing electrogenerated nucleophiles. We also discuss some advantages and disadvantages inherent in this general approach.

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“…The original motivation for using an electrochemical approach to CCC can be traced back to 1969, when Huebscher and Babinsky were interested in developing an efficient way to separate carbon dioxide from the atmosphere to be used for life support systems, specifically for use in submarines as well as air and space travel. 4 The system design can operate continuously and includes two electrochemical concentration cell stacks, a process air blower, and a dehumidifying-humidifying unit (Figure 1). The process of CO2 separation can be broken down into two stages, which are both typically operated at temperatures of 65°C or lower.…”

Section: History Of Ecccmentioning

confidence: 99%

“…Unlike other solvents, however, water readily reacts with dissolved CO2 in solution to form a complex buffer consisting of carbonic acid, bicarbonate, and carbonate (eq. [3][4][5].…”

Section: Overviewmentioning

confidence: 99%

Electrochemical Carbon Dioxide Capture and Concentration

Zito

Clarke

Barlow

et al. 2022

Preprint

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Electrochemical carbon capture and concentration (eCCC) offers a promising alternative to thermochemical processes as it circumvents the limitations of temperature-driven capture and release. This review will begin by discussing the history of eCCC, describing early work in the field and the motivation for pursuing such a process. We will then transition towards discussing more recent approaches, with a heavier emphasis on methods that employ redox mediators to facilitate CO2 capture and release. These methods rely more on optimization through chemical design and include pH-mediated systems, electrochemically-mediated amine regeneration, and direct capture with redox-active molecules. For each approach, we provide a general overview of the system, discuss redox mediator chemistries that have been studied in literature, and highlight requirements for future generations of redox mediators. We also describe previous demonstrations of each method and current cell/system designs that have been used at the lab-scale. To conclude, we summarize achievements in the field, current challenges, and opportunities for improving these technologies. Overall, this review is a comprehensive survey of the eCCC field and evaluates the chemical, theoretical, and electrochemical engineering aspects of this approach. We hope this work can be used to assist the community in the development of modern economical eCCC technologies that can be utilized in large-scale CCS processes.

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Electrochemical Concentration and Separation of Carbon Dioxide For Advanced Life Support Systems—Carbonation Cell System

Cited by 8 publications

References 1 publication

Solvent-Free CO₂ Capture Using Membrane Capacitive Deionization

Solvent-Free CO₂ Capture Using Membrane Capacitive Deionization

Electrochemical Capture and Release of Carbon Dioxide

Electrochemical Carbon Dioxide Capture and Concentration

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Electrochemical Concentration and Separation of Carbon Dioxide For Advanced Life Support Systems—Carbonation Cell System

Cited by 8 publications

References 1 publication

Solvent-Free CO2 Capture Using Membrane Capacitive Deionization

Solvent-Free CO2 Capture Using Membrane Capacitive Deionization

Electrochemical Capture and Release of Carbon Dioxide

Electrochemical Carbon Dioxide Capture and Concentration

Contact Info

Product

Resources

About

Solvent-Free CO₂ Capture Using Membrane Capacitive Deionization

Solvent-Free CO₂ Capture Using Membrane Capacitive Deionization