Novel anti-flooding poly(dimethylsiloxane) (PDMS) catalyst binder for microbial fuel cell cathodes

Zhang, Fang; Chen, Guang; Hickner, Michael A.; Logan, Bruce E.

doi:10.1016/j.jpowsour.2012.06.088

Cited by 75 publications

(27 citation statements)

References 32 publications

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“…Similar high power densities were achieved with smaller MFCs (<30 mL) using Pt-based cathode having optimized configuration. 40 To the best of our knowledge, the power density (200 μW cm −2 ) produced in this study is the highest power generation ever achieved in a SCMFC with volume larger than 100 mL. As it was expected, the use of Nafion membrane lowered the power output of the tested MFCs, which could be explained by three phenomena, taking place in the SCMFCs.…”

Section: Comparison Of Polarization Curves Of Abgd-box Cathodes Andsupporting

confidence: 61%

High Power Generation by a Membraneless Single Chamber Microbial Fuel Cell (SCMFC) Using Enzymatic Bilirubin Oxidase (BOx) Air-Breathing Cathode

Santoro

Babanova

Atanassov

et al. 2013

J. Electrochem. Soc.

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In this work, for the first time, we showed the successful utilization of enzymatic-based (bilirubin oxidase, BOx) air-breathing gas-diffusion (ABGD-BOx) cathode in membraneless single chamber microbial fuel cells (SCMFCs). At pH range of 7.2-7.5, the cathode open circuit potentials (OCPs) achieved were in the range of 490-535 mV (vs. sat. Ag/AgCl) with the anodic OCP being between −495 mV and −530 mV (vs. sat. Ag/AgCl). The highest overall open circuit voltage (OCV) of the SCMFCs (1.05 V) fed with phosphate buffer solution (PBS) and sodium acetate (NaOAc) was achieved after 12-24 hour of operation. Polarization curves of the ABGD-BOx cathode showed lower overpotential with an advantage of up to 250 mV compared to the traditional platinum Pt-based cathode, and possessed a great potential to replace the noble metal-based cathodes in MFCs. High power generation of 2 W m −2 (200 μW cm −2 , referred to cathode geometric surface area) was achieved in SCMFCs with the ABGD-BOx cathode, which was the highest power generation reported for SCMFCs with a volume greater than 100 mL.The Microbial fuel Cell (MFC) is a promising bio-electrochemical system capable of converting organic compounds (e.g. organic wastes) into useful electricity. It consists of two half-cells -the anode and the cathode -which are typically separated by an ion selective membrane. The anode electrode is immersed in a solution containing organic compounds, and the anodophillic bacteria, growing on the anode surface, oxidize the organic substances through their metabolic processes. At the cathode, oxygen is normally used as the final electron acceptor. In this case, the oxygen reacts with the electrons generated from the anode and along with the protons, released during the oxidation at the anode, produces water.To accelerate the cathodic oxygen reduction reaction (ORR), catalysts (e.g. noble metals, platinum) are quite often used in MFCs. Even though the efficiency of the platinum (Pt)-based cathodes has been reported to be high in acidic solutions, 1 it is actually significantly lower in the neutral/mildly alkaline solutions. 1 The cathode open circuit potential (OCP) achieved with Pt-based electrodes in MFCs at ambient temperatures and neutral media is relatively low (0.3-0.4 V vs sat. Ag/AgCl 2 ), compared to the theoretical ORR potential (∼0.62 V vs. sat. Ag/AgCl). This is an indication of high overpotentials for the ORR. Moreover, the direct contact of the catalyst with the solution in the MFCs, leads to cathode flooding and large ohmic losses, 2 which lowers the overall performance of MFCs.In order to reduce the MFC costs, enhance power generation, and prolong the lifetime of cathodic systems, extensive studies have been conducted to develop novel cost-effective metal-based 3-6 or nonmetal-based 7-10 catalysts. It has been found that the ORR kinetics of these metals/non-metal-based cathodes enhanced significantly at higher temperatures, 11 indicating that this type of reaction is hindered in MFCs operated at ambient temperature.Enzymes have recent...

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Section: Comparison Of Polarization Curves Of Abgd-box Cathodes Andsupporting

confidence: 61%

High Power Generation by a Membraneless Single Chamber Microbial Fuel Cell (SCMFC) Using Enzymatic Bilirubin Oxidase (BOx) Air-Breathing Cathode

Santoro

Babanova

Atanassov

et al. 2013

J. Electrochem. Soc.

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“…Significant difference in R s values were estimated in MFC using unmodified anode (MFC-1) and GO/PTFE modified anode (MFC-2) with a value of 18.7 Ω and 3.2 Ω, respectively, probably due to higher overpotential loss in MFC-1 as compared to MFC-2. At higher over potential, solution resistance dominates and decreases the performance of MFC [21]. Enhanced bio-catalytic property of anode using GO/PTFE modified carbon felt was observed due to synergetic effect of graphene oxide and PTFE.…”

Section: Electrochemical Analysismentioning

confidence: 97%

Graphene Oxide/Polytetrafluoroethylene Composite Anode and Chaetoceros pre-Treated Anodic Inoculum Enhancing Performance of Microbial Fuel Cell

Rajesh¹,

Noori²,

Ghangrekar³

2018

JOCET

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Electricity generation from microbial fuel cell (MFC) can be enhanced by proper manifestation of electrogenic bacterial growth on anode surface. Effect of graphene oxide (GO)/ Polytetrafluoroethylene (PTFE) composite bio-anode and Chaetoceros pre-treated anodic inoculum on electricity generation in MFC was investigated in the present work. MFC using GO/PTFE composite bio-anode demonstrated a maximum power density of 20.52 W/m 3 ; whereas, MFC using bare carbon felt anode without modification produced a maximum power density of 10.25 W/m 3 and this was 3.43 W/m 3 for MFC using carbon felt anode inoculated with mixed anaerobic sludge without pre-treatment. Coulombic efficiency (CE) of 41.82 % was obtained in MFC with modified bio-anode using Chaetoceros algae pre-treated mixed anaerobic sludge as anodic inoculum. This CE obtained is far superior than the values reported earlier using mixed anaerobic sludge as inoculum. Increased catalytic current and lower charge transfer resistance were observed during linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) for MFC with GO/PTFE modified anode as compared to MFC using unmodified anode. Thus, GO/PTFE modified carbon felt anode with Chaetoceros pre-treated mixed anaerobic sludge as inoculum could be used in MFC to enhance the power harvested by this device while simultaneously offering effective treatment to wastewater.

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“…[23][24][25] Therefore, a volumetric power density of 2.15 kW/m 3 was generated in a 0.335 mL reactor with a cathode area of 1920 m 2 /m 3 in the presence of hexacyanoferrate. [26] The optimization of the cathode has a great importance to optimize the performance of MFC and can be carried out using conductive materials with high surface area, such as Poly(dimethylsiloxane), [27] polytetrafluoroethylene [28] or Goretex cloth. [29] Compact reactor designs and the use of multiple electrodes are required for scaling up MFC.…”

Section: Introductionmentioning

confidence: 99%

A flat microbial fuel cell for decentralized wastewater valorization: process performance and optimization potential

Peixoto

Rodrigues

Martins

et al. 2013

Environmental Technology

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A very compact flat microbial fuel cell (MFC), with 64 cm2 each for the anode surface and the cathode surface and 1 cm3 each for the anode and cathode chambers, was tested for wastewater treatment with simultaneous electricity production with the ultimate goal of implementing an autonomous service in decentralized wastewater treatment systems. The MFC was operated with municipal wastewater in sequencing batch reactor mode with re-circulation. Current densities up to 407 W/m3 and a carbon removal of 83% were obtained. Interruption in the operation slightly decreased power density, while the re-circulation ratio did not influence power generation. The anode biofilm presented high conductivity, activity and diversity. The denaturing gradient gel electrophoresis band-pattern of the DNA showed the presence of several ribotypes with different species of Shewanellaceae and Geobacteraceae families.

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Novel anti-flooding poly(dimethylsiloxane) (PDMS) catalyst binder for microbial fuel cell cathodes

Cited by 75 publications

References 32 publications

High Power Generation by a Membraneless Single Chamber Microbial Fuel Cell (SCMFC) Using Enzymatic Bilirubin Oxidase (BOx) Air-Breathing Cathode

High Power Generation by a Membraneless Single Chamber Microbial Fuel Cell (SCMFC) Using Enzymatic Bilirubin Oxidase (BOx) Air-Breathing Cathode

Graphene Oxide/Polytetrafluoroethylene Composite Anode and Chaetoceros pre-Treated Anodic Inoculum Enhancing Performance of Microbial Fuel Cell

A flat microbial fuel cell for decentralized wastewater valorization: process performance and optimization potential

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