Microbial fuel cells with enhanced bacterial catalytic activity and stability using 3D nanoporous stainless steel anode

Abbas, Alaa A.; Farrag, Heba H.; Sawy, Ehab N. El; Allam, Nageh K.

doi:10.1016/j.jclepro.2020.124816

Cited by 25 publications

(15 citation statements)

References 86 publications

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“…Note that each annealing atmosphere has a different effect on the morphology of the anodized SS samples . For ASS-Air samples, there are some islands of particles appeared over the porous layer that, most likely, are Fe (Figure b). In comparison, ASS-H 2 appeared as interconnected nanoparticles (Figure c).…”

Section: Resultsmentioning

confidence: 99%

“…The mesh pieces were cleaned in acetone, ethanol, and water for 5 min each using ultrasonication. The anodization process was done following the process reported previously . Briefly, the samples were anodized in a bath (100 mL) containing 70% ethylene glycol, 5% sulfuric acid, 5% water, 20% methanol, and 3 M ammonium fluoride at 40 V for 5 min.…”

Section: Methodsmentioning

confidence: 99%

“…The anodization process was done following the process reported previously. 42 Briefly, the samples were anodized in a bath (100 mL) containing 70% ethylene glycol, 5% sulfuric acid, 5% water, 20% methanol, and 3 M ammonium fluoride at 40 V for 5 min. Then, the samples were washed with deionized water and left to dry in air.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Facile Surface Treatment of Industrial Stainless Steel Waste Meshes at Mild Conditions to Produce Efficient Oxygen Evolution Catalysts

et al. 2022

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Herein, the ability to convert waste stainless steel (SS) 316L meshes into highly efficient and durable oxygen evolution reaction (OER) catalysts is demonstrated. The process involves surface treatment of previously anodized SS meshes in different gaseous atmospheres. The activity of the resulted electrocatalysts varies as-anodized SS annealed in oxygen (ASS-O2) > anodized SS annealed in hydrogen (ASS-H2) > anodized SS annealed in air (ASS-Air). The ASS-O2 showed an impressive low overpotential of 280 mV at the benchmark current density of 10 mA/cm2, which is 120 mV less than that of the as-received SS (SS-AR), and a low Tafel slope of 63 mV dec–1 in 1 M KOH. These findings have also been asserted by the estimated electrochemical active surface area, electrochemical impedance spectroscopy analysis, Mott–Schottky analysis, and the calculated turnover frequency, affirming the superiority of the ASS-O2 electrocatalyst over the ASS-H2 and ASS-Air counterparts. The high activity of the ASS-O2 electrocatalyst can be ascribed to the surface composition that is rich in Fe3+ and Ni2+ as revealed by the X-ray photoelectron spectroscopy analysis. The simple method of anodization and thermal annealing in O2 at moderate conditions (450 °C for 1 h) lead to the formation of a SS mesh-based OER electrocatalyst with activity exceeding that of the state-of-the-art IrO2/RuO2 and other complex modified SS catalysts. These results were also confirmed via density functional theory calculations, which unveiled the OER reaction mechanism and elucidated the d-band center in different SS samples with different oxygen content. The presence of oxygen moved the d-band center closer to the Fermi level in the case of ASS-O2, explaining its superior activity.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Facile Surface Treatment of Industrial Stainless Steel Waste Meshes at Mild Conditions to Produce Efficient Oxygen Evolution Catalysts

et al. 2022

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“…Different approaches, including the use of anode materials such as metal/metal oxide-based anodes, modification with conductive nanoparticles or composites, , and more, are used for effective microbial–electrode interactions. The utilization of metallic 3D electrodes, including the nickel foam, stainless-steel mesh, and carbon materials like carbon nanotubes, graphene, activated carbon, and carbon brush, has been demonstrated as a promising approach in enhancing the EET and BES performance. Currently, researchers are focusing on decorating or patterning the existing electrode surface with conductive polymers or nanoparticles and more as patterned surfaces, which provide unambiguous structural qualities, such as the shape, structural parameters, and chemical and physical characteristics, to increase the total contact area for microbial EET.…”

Section: Introductionmentioning

confidence: 99%

Microbial-Inspired Surface Patterning for Selective Bacterial Actions for Enhanced Performance in Microbial Fuel Cells

Bijimol

Sreelekshmy

Kumar

et al. 2022

ACS Appl. Bio Mater.

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The performance of any bio-electrochemical system is dependent on the efficiency of electrode−microbial interactions. Surface properties play a focal role in bacterial attachment and biofilm formation on the electrodes. In addition to electrode surface properties, selective bacterial adhesion onto the electrode surface is mandatory to mitigate energy loss due to undesired bacterial interactions on the electrode surface. In the present study, microbial-patterned graphite scaffolds are developed for selective bacterial−electrode interactions. A power density as high as 1105 mW/m 2 is achieved with mG-E (a graphite electrode patterned with Escherichia coli), which is about 3 times higher than that of the pristine graphite electrode (370 mW/m 2 ). Initial mechanical pre-treatment of the graphite electrode, followed by bacterial patterning, results in the formation of a unique cobblestone topography with a tuned surface area of 127.12 m 2 /g. This provides suitable morphology with enhanced active sites for selective bacterial intercalation in graphite layers. This cannot be otherwise achieved by any mechanical or other means. A unique methodology of symbolic regression is adopted to validate a genetic algorithm suitable for predicting a perfect correlation between surface characteristics and electrochemical characteristics with a minimum root-mean-square error of 0.08. The bacterial intercalation onto the graphite electrode causes protuberance of the graphite layers that reduces the surface potential and resistance, leading to high electron transfer. The study presents a unique bacterial-inspired surface patterning on the anode, which is critical for the performance of a microbial fuel cell.

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“…46 Abbas et al used a 3D nanoporous SS as an anode material in MFCs to enhance the catalytic activity and stability of MFC anode biofilm. 47 Conductive polymers such as polypyrrole and polythiophene have also shown promise in anode modification. Conductive polymer improves not only power production but also startup performance.…”

Section: Introductionmentioning

confidence: 99%

A new modification method of metal substrates via candle soot to prepare effective anodes in air‐cathode microbial fuel cells

Gao

Cai

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Choosing applicable anodes can effectively promote the performance of microbial fuel cells (MFCs). This study introduced a novel method to prepare effective metal-based anodes modified by carbon nanoparticles (CNPs) derived from candle soot. The CNPs can be firmly coated on the metal and the modified metal surfaces show good hydrophilicity.RESULTS: This study used titanium mesh, stainless steel sheet and copper sheet as the anode's substrate, respectively. CNPs could improve the biocompatibility and electrochemical properties of these metals. The power generation performance of MFCs with CNP-modified anodes has been dramatically enhanced, and the maximum power density is 616 mW m −2 in MFCs with CNP-modified titanium mesh anode.CONCLUSION: After CNP modification, the rough surface and excellent biocompatibility could promote the attachment and growth of microorganisms, which may be the main reasons for the improvement of MFC performance. Besides, this method is suitable to modify different metal substrates. The results showed that the CNP-coated metal anodes could improve the power output of MFCs compared to pure metal anodes. Therefore, this method has significant advantages in the practical application of MFCs.

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Microbial fuel cells with enhanced bacterial catalytic activity and stability using 3D nanoporous stainless steel anode

Cited by 25 publications

References 86 publications

Facile Surface Treatment of Industrial Stainless Steel Waste Meshes at Mild Conditions to Produce Efficient Oxygen Evolution Catalysts

Facile Surface Treatment of Industrial Stainless Steel Waste Meshes at Mild Conditions to Produce Efficient Oxygen Evolution Catalysts

Microbial-Inspired Surface Patterning for Selective Bacterial Actions for Enhanced Performance in Microbial Fuel Cells

A new modification method of metal substrates via candle soot to prepare effective anodes in air‐cathode microbial fuel cells

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