Full cell simulation and the evaluation of the buffer system on air-cathode microbial fuel cell

Ou, Shiqi; Kashima, Hiroyuki; Aaron, Douglas; Regan, John J.; Mench, Matthew M.

doi:10.1016/j.jpowsour.2017.02.031

Cited by 32 publications

(10 citation statements)

References 28 publications

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“…An increase in pH from 3.12 (moderately acidic) to 4.05 ± 0.092 (slightly acidic) from the first to the seventh day is seen, followed by a decrease until the last day (3.30 ± 0.27), showing acidic pH throughout the monitoring. According to León et al, (2021), in pH with acidic levels, energy generation increases because it contributes to a higher potential of concentration of microorganisms for substrate oxidation [27,28]. Likewise, due to high concentrations of fermentable carbohydrates in cells, pH can drop rapidly due to the formation of acidic products by fermentative metabolism.…”

Section: Resultsmentioning

confidence: 99%

Bioelectricity Production from Blueberry Waste

et al. 2021

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Global warming and the increase in organic waste from agro-industries create a major problem for the environment. In this sense, microbial fuel cells (MFC) have great potential for the generation of bioelectricity by using organic waste as fuel. This research produced low-cost MFC by using zinc and copper electrodes and taking blueberry waste as fuel. A peak current and voltage of 1.130 ± 0.018 mA and 1.127 ± 0.096 V, respectively, were generated. The pH levels were acid, with peak conductivity values of 233. 94 ± 0.345 mS/cm and the degrees Brix were descending from the first day. The maximum power density was 3.155 ± 0.24 W/cm2 at 374.4 mA/cm2 current density, and Cándida boidinii was identified by means of molecular biology and bioinformatics techniques. This research gives a new way to generate electricity with this type of waste, generating added value for the companies in this area and helping to reduce global warming.

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Section: Resultsmentioning

confidence: 99%

Bioelectricity Production from Blueberry Waste

et al. 2021

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“…BioGAC) and fresh GAC particles, separately. It is quite common to add phosphate buffer saline (PBS) at a concentration ranging from 10 to 100 mM − to the MECs during electromethanogenesis. PBS solution has two critical functions in a bioelectrochemical system, namely, (i) adjusting the pH level and (ii) increasing the conductivity of the solution, which leads to better mass transfer and electrochemical conversion .…”

Section: Introductionmentioning

confidence: 99%

“…It is quite common to add phosphate buffer saline (PBS) at a concentration ranging from 10 to 100 mM − to the MECs during electromethanogenesis. PBS solution has two critical functions in a bioelectrochemical system, namely, (i) adjusting the pH level and (ii) increasing the conductivity of the solution, which leads to better mass transfer and electrochemical conversion . However, for a feedstock such as CM, pH buffer is not needed due to inherent alkalinity and the high phosphorus (P) concentration in PBS may have an adverse effect on methanogens.…”

Section: Introductionmentioning

confidence: 99%

“…PBS solution has two critical functions in a bioelectrochemical system, namely, (i) adjusting the pH level and (ii) increasing the conductivity of the solution, which leads to better mass transfer and electrochemical conversion. 19 However, for a feedstock such as CM, pH buffer is not needed due to inherent alkalinity and the high phosphorus (P) concentration in PBS may have an adverse effect on methanogens. As the impact of PBS has not been compared with another buffer in AD-MEC systems, in this work, AD-MEC performances were compared in terms of the CH 4 production yield, rate, and reactor start-up times under two different types of medium supplementation (PBS and salt medium).…”

Section: ■ Introductionmentioning

confidence: 99%

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Methane Recovery from Cattle Manure: Role of Granular Activated Carbon Amendment into Anaerobic Digestion-Microbial Electrolysis Cells (AD-MECs) Integrated Systems

Ghaderikia,

Yilmazel

2023

ACS Sustainable Chem. Eng.

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Anaerobic digestion (AD) of manure is commonly applied, yet the low methane (CH 4 ) production yield and rate are among the limitations of the process. AD integration with microbial electrolysis cells (MECs) and amendment of conductive materials to the digesters can compensate for the limitations via the enrichment of electroactive microorganisms. For the first time in the literature CH 4 production performances of cattle manure-fed AD-MECs were assessed under varying conditions, namely, by placing biofilm-attached electrodes (bioelectrodes) versus bare electrodes, the amendment of biofilm-attached granular activated carbon (BioGAC) particles versus fresh GAC particles under two different media (phosphate buffer saline (PBS) vs salt medium). The CH 4 yield of the AD reactor in PBS medium was notably low (50 mL/g VS added ) due to a severe P inhibition as compared to 247 mL of CH 4 /g VS added in the salt medium. AD-MECs alleviated inhibitory effects, that is, increased the yield and rate of CH 4 production and reduced the start-up time. Of all the reactors, the performance of BioGACamended AD-MECs were superior with a 4.4 times higher yield (∼223 mL CH 4 /g VS added ) than the control with PBS and a 1.3 times higher yield (∼318 mL CH 4 /g VS added ) than the control with salt medium. Despite requiring an electrical energy input, BioGAC-amended AD-MECs remain energy-positive compared to the control.

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“…4(7:60 × 10 −6 cm 2 /s[49]), v is the scanning rate (V s -1 ), A is the effective electroactive area (m 2 ), and C is concentration of PBS (mol cm -3 ). Their effective areas were described to be 0.00269, 0.00695, 0.00945, 0.00942, and 0.00984 cm2 for unmodified PGE, α-MnO 2 /PGE, PANI/PGE, α-MnO 2 /PA-NI/PGE, and α-MnO 2 /NiO/PANI/PGE, respectively.…”

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confidence: 99%

Surface Roughness and Electrochemical Performance Properties of Biosynthesized α-MnO2/NiO-Based Polyaniline Ternary Composites as Efficient Catalysts in Microbial Fuel Cells

Dessie

Tadesse

Eswaramoorthy

2021

Journal of Nanomaterials

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In this study, biosynthesized α-MnO2/NiO NPs and chemically oxidative polyaniline (PANI) were synthesized to form ternary composite anode material for MFC. The synthesized materials were characterized with different materials (UV-Vis, FTIR, XRD, TGA-DTA-DSC, SEM-EDX-Gwyddion, CV, and EIS) to deeply examine their optical, structural, morphological, thermal, roughness, and electrocatalytic properties. The degree of surface roughness for α-MnO2/NiO/PANI was 23.65 ± 5.652 nm . This value was higher than the pure α-MnO2, pure PANI, and even α-MnO2/PANI nanocomposite due to surface modification. The total charge storing performance for bare PGE, α-MnO2/PGE, PANI/PGE, α-MnO2/PANI/PGE, and α-MnO2/NiO/PANI/PGE were 5.291, 17.267, 20.659, 23.258, and 24.456 mC. From this, the charge storing performance formed by α-MnO2/NiO/PANI-modified PGE was highest, indicating that this electrode is best in cycle stability and increases its life cycle during energy conversion time in MFC. This is also supported by its effective surface area, having a value of 0.00984 cm2. From this, it is evidenced that the ternary composite catalyst-modified anode facilitates the fast electrocatalytic activity as observed from its high peak current and lower peak-to-peak potential separation ( Δ E p = 0.216 V ) than other electrodes. Such surface modification helps to store more electrical charge by increasing electrical conductivity during its charge/discharge processing time. In addition, the lower charge transfer resistance property with a value of 788.9 Ω and the fast heterogeneous electron transfer rate of ~2.92 s-1 enable to facilitate glucose oxidation, and this enhances to produce high power output and increase wastewater treatment efficiency. As a result, the bioelectrical activity of α-MnO2/NiO/PANI composite-modified PGE was very effective in producing a maximum power density of 506.96 mW m-2 with COD of 81.92%. The above observations justified that α-MnO2/NiO/PANI/PGE serves as an effective anode material in double-chambered MFC application.

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Full cell simulation and the evaluation of the buffer system on air-cathode microbial fuel cell

Cited by 32 publications

References 28 publications

Bioelectricity Production from Blueberry Waste

Bioelectricity Production from Blueberry Waste

Methane Recovery from Cattle Manure: Role of Granular Activated Carbon Amendment into Anaerobic Digestion-Microbial Electrolysis Cells (AD-MECs) Integrated Systems

Surface Roughness and Electrochemical Performance Properties of Biosynthesized α-MnO2/NiO-Based Polyaniline Ternary Composites as Efficient Catalysts in Microbial Fuel Cells

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