A comprehensive comparison of five different carbon-based cathode materials in CO2 electromethanogenesis: Long-term performance, cell-electrode contact behaviors and extracellular electron transfer pathways

Zhen, Guangyin; Zheng, Shaojuan; Lü, Xueqin; Zhu, Xuefeng; Mei, Juan; Kobayashi, Takuro; Xu, Kaiqin; Li, Yu You; Zhao, Youcai

doi:10.1016/j.biortech.2018.06.101

Cited by 71 publications

(21 citation statements)

References 49 publications

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“…Moreover, at lower E cat it is possible to increase reaction kinetics and achievable CH 4 production rate ( Figure 1). [8,[14][15][16][17][18][19][20][21][22][23][24]. Surface specific methane production rate values are reported versus applied cathode potential.…”

Section: Introductionmentioning

confidence: 99%

“…Microbial inoculum source (for both bioanode and biocathode) can range from activated to anaerobic sludge, collected at municipal wastewater treatment plants (WWTPs), or enriched cultures from previously operated BES. Electrodes material is usually carbonaceous based, in form of carbon cloth, fiber or paper [17,26]. Graphite felt showed good results given its 3D structure suitable to biofilm attachment [17].…”

Section: Introductionmentioning

confidence: 99%

“…Electrodes material is usually carbonaceous based, in form of carbon cloth, fiber or paper [17,26]. Graphite felt showed good results given its 3D structure suitable to biofilm attachment [17].…”

Section: Introductionmentioning

confidence: 99%

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Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

et al. 2019

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Anaerobic digestion of sewage sludge produces large amounts of CO2 which contribute to global CO2 emissions. Capture and conversion of CO2 into valuable products is a novel way to reduce CO2 emissions and valorize it. Membrane contactors can be used for CO2 capture in liquid media, while bioelectrochemical systems (BES) can valorize dissolved CO2 converting it to CH4, through electromethanogenesis (EMG). At the same time, EMG process, which requires electricity to drive the conversion, can be utilized to store electrical energy (eventually coming from renewables surplus) as methane. The study aims integrating the two technologies at a laboratory scale, using for the first time real wastewater as CO2 capture medium. Five replicate EMG-BES cells were built and operated individually at 0.7 V. They were fed with both synthetic and real wastewater, saturated with CO2 by membrane contactors. In a subsequent experimental step, four EMG-BES cells were electrical stacked in series while one was kept as reference. CH4 production reached 4.6 L CH4 m−2 d−1, in line with available literature data, at a specific energy consumption of 16–18 kWh m−3 CH4 (65% energy efficiency). Organic matter was removed from wastewater at approximately 80% efficiency. CO2 conversion efficiency was limited (0.3–3.7%), depending on the amount of CO2 injected in wastewater. Even though achieved performances are not yet competitive with other mature methanation technologies, key knowledge was gained on the integrated operation of membrane contactors and EMG-BES cells, setting the base for upscaling and future implementation of the technology.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

et al. 2019

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“…9. The concentration of organic acid at various times according to Wang et al [25] and Zhen et al [26] carbon cloth has a high capacity of H2 evolution, which certainly occurred in the system. In this study, butyrate was the main product.…”

Section: Coconut Shell-based Cathode For Application In Mes Systemmentioning

confidence: 98%

Synthesis of Graphite Porous Electrode Based on Coconut Shell as a Potential Cathode in Bioelectrosyntesis Cell

Mukimin¹,

Yuliasni²,

Zen³

et al. 2019

Indones. J. Chem.

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Electrodes, as well as microorganisms, are key materials for the development of bioelectrosynthesis cell reactor. Materials used as electrodes should be inert, crystalline in structure with high surface area and porous morphology, enhancing their electroactive and adsorptive properties. Carbon material derived from coconut shell was modified by simultaneous sintering-activation methods, FeCl3 and ZnCl2 were supplemented at temperature 900 °C at the non-atmospheric condition. The modified carbon was then molded with polyvinyl alcohol as a binder and the temperature was maintained at 80 °C and 10 ton of pressure. Molded carbon was then installed in bioelectrosynthesis cell with a working volume of 200 mL, as a cathode. XRD, BET, and SEM measurements showed the transformation of carbon surface from amorphous into the crystalline, increased surface area (11 times higher) and higher porosity (up to 500 nm). This cathode modification was able to increase current density up to 4 times and reduce CO2 into butyrate, 250 mg/L, in bioelectrosynthesis cell.

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“…Naturally, the cathode as working electrode often lies within the focus of research and optimization in MES technology. As an example, different carbon based electrodes with various structures were tested, carbon electrodes were combined to assemblies such as carbon sticks wrapped with carbon paper, or assemblies with metal wires . To further improve the performance, carbon materials were coated with metal particles or polymers .…”

Section: Introductionmentioning

confidence: 99%

Insights in the anode chamber influences on cathodic bioelectromethanogenesis – systematic comparison of anode materials and anolytes

Enzmann

Stöckl

Gronemeier

et al. 2019

Engineering in Life Sciences

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Cathode and catholyte are usually optimized to improve microbial electrosynthesis process, whereas the anodic counter reaction was not systematically investigated and optimized for these applications yet. Nevertheless, the anolyte and especially the anode material can limit the cathodic bioelectrochemical process. This paper compares for the first time the performance of different anode materials as counter electrodes for a cathodic bioelectrochemical process, the bioelectromethanogenesis. It was observed that depending on the anode material the cathodic methane production varies from 0.96 µmol/d with a carbon fabric anode to 25.44 µmol/d with a carbon felt anode of the same geometrical surface area. The used anolyte also affected the methane production rate at the cathode. Especially, the pH of the anolyte showed an impact on the system; an anolyte with pH 5 produced up to 2.0 times more methane compared to one with pH 8.5. The proton availability is discussed as one reason for this effect. Although some of the measured effects cannot be explained completely so far this study advises researchers to strongly consider the anode impact during process development and optimization of a cathodic bioelectrochemical synthesis process.

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A comprehensive comparison of five different carbon-based cathode materials in CO2 electromethanogenesis: Long-term performance, cell-electrode contact behaviors and extracellular electron transfer pathways

Cited by 71 publications

References 49 publications

Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

Synthesis of Graphite Porous Electrode Based on Coconut Shell as a Potential Cathode in Bioelectrosyntesis Cell

Insights in the anode chamber influences on cathodic bioelectromethanogenesis – systematic comparison of anode materials and anolytes

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