Membrane-free electrochemical deoxygenation of aqueous solutions using symmetric activated carbon electrodes in flow-through cells

Holubowitch, Nicolas E.; Omosebi, Ayokunle; Gao, Xin; Landon, James; Liu, Kunlei

doi:10.1016/j.electacta.2018.11.106

Cited by 9 publications

(19 citation statements)

References 83 publications

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“…Porous silver electrodes were initially used to remove oxygen in the solution of analysis . Different configurations and electrode materials have been proposed to reach the complete oxygen removal for analytical or other purposes. ,− Drawbacks of such approaches are the production of H 2 O 2 or the alteration of pH due to a quantitative conversion of oxygen initially present in the treated solution . Miniaturization has been described using two gold porous electrodes in a glass microcapillary to remove oxygen interfering with N 2 O detection, and application of electrochemically dissolved oxygen removal from microfluidic streams was also shown .…”

mentioning

confidence: 99%

“…7,12−14 Drawbacks of such approaches are the production of H 2 O 2 or the alteration of pH due to a quantitative conversion of oxygen initially present in the treated solution. 14 Miniaturization has been described using two gold porous electrodes in a glass microcapillary to remove oxygen interfering with N 2 O detection, 2 and application of electrochemically dissolved oxygen removal from microfluidic streams was also shown. 15 Finally, a sandwich electrode was evaluated for multigas analysis.…”

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confidence: 99%

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Electrochemical Filter To Remove Oxygen Interference Locally, Rapidly, and Temporarily for Sensing Applications

Etienne

Nasir

et al. 2020

Anal. Chem.

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confidence: 99%

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confidence: 99%

Electrochemical Filter To Remove Oxygen Interference Locally, Rapidly, and Temporarily for Sensing Applications

Etienne

Nasir

et al. 2020

Anal. Chem.

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“…An appealing approach to avoid O 2 formation at the anode is carbon-assisted water electrolysis (CAWE) for which carbon is oxidized at the anode instead of the OER in conventional electrolysis (Ju et al, 2018; Holubowitch et al, 2019). The classical hydrogen-evolution reaction (HER) is the same for CAWE and conventional water electrolysis.…”

Section: Introductionmentioning

confidence: 99%

“…An example of carbon oxidation with carbon-based anodes was shown by Holubowitch et al (2019), who demonstrated an abiotic membrane-less electrochemical cell that was capable of reducing O 2 to deoxygenate water. While their main focus was on reducing O 2 , we identified with their data that either no O 2 was produced or O 2 production was decreased at the anode and that O 2 was electrochemically reduced at the cathode.…”

Section: Introductionmentioning

confidence: 99%

Carbon oxidation with sacrificial anodes to inhibit O₂evolution in membrane-less bioelectrochemical systems for microbial electrosynthesis

Rohbohm

Sun

Blasco-Gómez

et al. 2022

Preprint

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Microbial electrosynthesis is an emerging biosynthesis technology that produces value-added chemicals and fuels and, at the same time, reduces the environmental carbon footprint. However, constraints, such as low current densities and high inner resistance, disfavor this technology for industrial-scale purposes. The cathode performance has been strongly improved in recent years, while the anode performance has not been given enough attention despite its importance in closing the electric circuit. For traditional water electrolysis, O2 is produced at the anode, which is toxic to the anaerobic autotrophs that engage in microbial electrosynthesis. To overcome O2 toxicity in conventional microbial electrosynthesis, the anode and the cathode chamber have been separated by an ion-exchange membrane to avoid contact between the microbes and O2. However, ion-exchange membranes increase the maintenance costs and compromise the production efficiency by introducing an additional internal resistance. Furthermore, O2 is inevitably transferred to the catholyte due to diffusion and electro-osmotic fluxes that occur within the membrane. Here, we proved the concept of integrating carbon oxidation with sacrificial anodes and microbes to simultaneously inhibit the O2 evolution reaction (OER) and circumvent membrane application, which allows microbial electrosynthesis to proceed in a single chamber. The carbon-based anodes performed carbon oxidation as the alternative reaction to the OER. This enables microbial electrosynthesis to be performed with cell voltages as low as 1.8-2.1 V at 10 A m-2. We utilized Methanothermobacter thermoautotrophicus DeltaH in a single-chamber Bioelectrochemical system (BES) with the best performing carbon-based anode (i.e., activated-carbon anode with soluble iron) to achieve a maximum cathode-geometric CH4 production rate of 27.3 L m-2 d-1, which is equal to a volumetric methane production rate of 1.1x10-1 L L-1 d-1 in our BES, at a Coulombic efficiency of 99.4%. This proof-of-concept study allows microbial electrosynthesis to be performed more energy-efficiently and can be immediately utilized for research purposes in the microbial electrosynthesis field of study.

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“…This decrease is primarily due to the corrosion of carbon in the anode . Corrosion is driven by highly positive anode potentials , and the presence of dissolved oxygen (DO) in the feedwater. − As shown in eq , carbon oxidation can lead to loss of carbon and generation of H + that decrease the bulk pH. …”

Section: Introductionmentioning

confidence: 99%

Improving Long-Term Anode Stability in Capacitive Deionization Using Asymmetric Electrode Mass Ratios

Algurainy

Call

2021

ACS EST Eng.

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Activated carbon (AC) electrodes are used for desalination in capacitive deionization (CDI) because they provide a large, porous surface area at a low cost. In short-term tests, AC electrodes can achieve relatively high salt adsorption capacities. In long-term tests, desalination performance degrades significantly. The poor performance has been attributed to the corrosion of carbon in the anode electrode. Here, we show a simple strategy to improve anode stability by changing the mass ratio of AC electrodes (asymmetric configuration) in flow-through CDI (FT-CDI). Increasing the anode mass by double and triple decreased the anode half-cell potential by up to 21 and 64%, respectively, relative to cells with single anodes. Less positive anode potentials were associated with smaller shifts in the anode potential of zero charge and lower acidity in the effluent. Additional evidence for improved anode stability in the asymmetric configurations was the significantly lower charge transfer resistance and oxygen to carbon ratio content of the anodes at the end of the tests. After 48 h of operation, the salt adsorption capacity decreased by 68% in symmetric cells, but, in asymmetric cells, it was more stable and decreased by only 47% (double anode) and 17% (triple anode). These trends were consistent when the anode was located upstream or downstream of the cathode. We attribute the improved anode stability to reduced oxidation in the asymmetric cells, which was driven by lower oxidative half-cell potentials. This, in turn, maintained a stable desalination performance over long-term operation. Our results demonstrate that increasing the anode mass is an effective strategy to extend anode stability and improve long-term salt removal in FT-CDI.

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Membrane-free electrochemical deoxygenation of aqueous solutions using symmetric activated carbon electrodes in flow-through cells

Cited by 9 publications

References 83 publications

Electrochemical Filter To Remove Oxygen Interference Locally, Rapidly, and Temporarily for Sensing Applications

Electrochemical Filter To Remove Oxygen Interference Locally, Rapidly, and Temporarily for Sensing Applications

Carbon oxidation with sacrificial anodes to inhibit O₂evolution in membrane-less bioelectrochemical systems for microbial electrosynthesis

Improving Long-Term Anode Stability in Capacitive Deionization Using Asymmetric Electrode Mass Ratios

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Membrane-free electrochemical deoxygenation of aqueous solutions using symmetric activated carbon electrodes in flow-through cells

Cited by 9 publications

References 83 publications

Electrochemical Filter To Remove Oxygen Interference Locally, Rapidly, and Temporarily for Sensing Applications

Electrochemical Filter To Remove Oxygen Interference Locally, Rapidly, and Temporarily for Sensing Applications

Carbon oxidation with sacrificial anodes to inhibit O2evolution in membrane-less bioelectrochemical systems for microbial electrosynthesis

Improving Long-Term Anode Stability in Capacitive Deionization Using Asymmetric Electrode Mass Ratios

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Carbon oxidation with sacrificial anodes to inhibit O₂evolution in membrane-less bioelectrochemical systems for microbial electrosynthesis