Low-energy-consumption electrochemical CO2 capture driven by biomimetic phenazine derivatives redox medium

Xie, Heping; Wu, Yifan; Liu, Tao; Wang, Fuhuan; Chen, Bin; Liang, Bin

doi:10.1016/j.apenergy.2019.114119

Cited by 57 publications

(61 citation statements)

References 41 publications

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“…Subsequently, the captured CO 2 can be released at the anode through oxidation of the carrier while the carrier is regenerated. This process is also referred to as "electrochemical CO 2 pumping" [135,137], see Figure (13a). The cycle can be broken down into four steps [41]:…”

Section: Redox-active Carriers and Electrode Reactionsmentioning

confidence: 99%

“…In order to improve the kinetics of CO 2 capture and release, the "pH-swing route" can be integrated, where the chemistry of redox-active carriers are designed to undergo proton coupled electron transfer (PCET) reactions [135,136,138,139], as shown in Figure (13b) [135,136,140]. If so, an "electrochemical H + pumping" takes place that enables an acidic and a basic pH on the anode and the cathode, respectively.…”

Section: Redox-active Carriers and Electrode Reactionsmentioning

confidence: 99%

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Electrochemical carbon dioxide capture to close the carbon cycle

Sharifian

Wagterveld²,

Digdaya

et al. 2021

Energy Environ. Sci.

306

196

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Section: Redox-active Carriers and Electrode Reactionsmentioning

confidence: 99%

Section: Redox-active Carriers and Electrode Reactionsmentioning

confidence: 99%

Electrochemical carbon dioxide capture to close the carbon cycle

Sharifian

Wagterveld²,

Digdaya

et al. 2021

Energy Environ. Sci.

306

196

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show abstract

“…1.7b) or fixed in the electrode matrix 57 . This system shows promising low energy consumption values (~20-90 kJ molCO2 -1 ) 56,57 . Electrochemical cell using a faradaic swing to capture CO2 (based on Refs.…”

Section: Faradaic Electro-swing Co2 Adsorptionmentioning

confidence: 98%

“…The main advantages of electrochemical capture technologies include (i) no use of toxic and corrosive chemical solvents 49 , (ii) better control and tuning of the strength of CO2 binding 48 , (iii) possibility to minimize side reactions, and (iv) potentially minimizing the energy consumption 48 . Beside CO2-CDI, other electrochemical CO2 capture technologies have been recently reported for CO2 capture, e.g., molten carbonate CO2 concentrator [50][51][52] , pH swing 49,[53][54][55] , faradaic electro-swing 48,56,57 and supercapacitive swing adsorption [58][59][60][61] .…”

Section: Development Of Electrochemical Co2 Capture Technologiesmentioning

confidence: 99%

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Capacitive processes for carbon capture and energy recovery from CO2 emissions : Shaping a new technology going from water to gas applications

Legrand¹

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Nonetheless, how can we convert a water technology into a gas technology? The first step is to identify a strategy to produce ions from CO2 gas. As CO2 gas is not an ion, the CDI and CAPMIX cells are not directly usable with gas streams. Nevertheless, ions can be generated from CO2 by sparging CO2 gas in water, a process in which bicarbonate ions are formed (see Box 1). 1.3.2. Electrochemical pH swing CO2 capture can be achieved by generating a pH swing between two chambers in an electrochemical cell. The electrochemical pH swing has been mostly investigated in electrodialysis cell 62,63 and bipolar electrodialysis cell 49,53-55. The CO2 absorption takes place in the alkaline compartment (high pH) through the reaction of CO2 with hydroxide (CO + OH → HCO), whereas the CO2 desorption takes place in the acidic compartment (HCO + H → CO). Fig. 1.6 shows an example of CO2 capture with bipolar electrodialysis. Supercapacitive swing adsorption (SAA) is an electrical double-layer capacitor (EDLC) for CO2 capture 58-61. The concept consists of adsorbing CO2 on the cathode in a gas channel while charging the EDLC cell in a highly concentrated NaCl solution. Fig. 1.8 shows an illustration of the SAA concept. Three mechanisms have been suggested for the CO2 gas adsorption in the electrodes, i.e. (a) adsorption of gas molecules at gas-solid interface, (b) adsorption of gas molecules at the gas-liquid interface, and (c) adsorption of ionized gas molecule 61. Adsorption at the gas-solid interface would occur when CO2 gas is adsorbed in non-filled electrode pores stimulated by a change of affinity between the pore wall and CO2 during the charging step of the cell. Adsorption at the gas-liquid interface would occur due to an increased CO2 solubility in the electrical double layer (EDL) by charging the capacitive cell. Finally, ionization adsorption occurs through the adsorption where ϵ. is the dielectric constant, ϵ 0 is the permittivity of free space, R the gas constant, T the temperature, F the Faraday constant and c 4 the ion concentration in the bulk solution. Finally, the Stern layer represents the layer of solution separating the diffuse layer, and the carbon matrix surface. In theory, ions are surrounded by a hydration shell, and therefore, the charged ions are not infinitely close to the electrode surface. IEMs are ionomer, i.e., charged polymer, which primarily act as selective charge barriers. Ideally, only anions can be transported through the AEM, and only cations can be transported through the CEM (counter-ion transport). IEMs are mainly used in CDI to improve the charge efficiency (in Membrane CDI or MCDI) 70,72 and are required in CAPMIX to generate an electrical potential.

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Electrochemically Mediated Sustainable Separations in Water

Tan

Hatton

2022

Sustainable Separation Engineering

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Low-energy-consumption electrochemical CO2 capture driven by biomimetic phenazine derivatives redox medium

Cited by 57 publications

References 41 publications

Electrochemical carbon dioxide capture to close the carbon cycle

Electrochemical carbon dioxide capture to close the carbon cycle

Capacitive processes for carbon capture and energy recovery from CO2 emissions : Shaping a new technology going from water to gas applications

Electrochemically Mediated Sustainable Separations in Water

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