Combined carbon mesh and small graphite fiber brush anodes to enhance and stabilize power generation in microbial fuel cells treating domestic wastewater

Wu, Shijia; He, Weihua; Yang, Wulin; Ye, Yaoli; Huang, Xia; Logan, Bruce E.

doi:10.1016/j.jpowsour.2017.01.041

Cited by 78 publications

(22 citation statements)

References 33 publications

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“…Few reviews summarize the achievements on the catalysis in neutral media [17] , [18] , [19] , [20] , [21] , [22] . The first choice is quite utilized lately due to the material low cost, durability and the relatively high electrocatalytic activity towards ORR [21] , [22] , [23] , [24] , [25] , [26] , [27] , [28] . In the recent years, activated carbon (AC) is by far the most adopted catalyst in microbial fuel cells (MFCs).…”

Section: Introductionmentioning

confidence: 99%

Power generation in microbial fuel cells using platinum group metal-free cathode catalyst: Effect of the catalyst loading on performance and costs

Santoro

Kodali

Herrera

et al. 2018

Journal of Power Sources

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Platinum group metal-free (PGM-free) catalyst with different loadings was investigated in air breathing electrodes microbial fuel cells (MFCs). Firstly, the electrocatalytic activity towards oxygen reduction reaction (ORR) of the catalyst was investigated by rotating ring disk electrode (RRDE) setup with different catalyst loadings. The results showed that higher loading led to an increased in the half wave potential and the limiting current and to a further decrease in the peroxide production. The electrons transferred also slightly increased with the catalyst loading up to the value of ≈3.75. This variation probably indicates that the catalyst investigated follow a 2x2e− transfer mechanism. The catalyst was integrated within activated carbon pellet-like air-breathing cathode in eight different loadings varying between 0.1 mgcm−2 and 10 mgcm−2. Performance were enhanced gradually with the increase in catalyst content. Power densities varied between 90 ± 9 μWcm−2 and 262 ± 4 μWcm−2 with catalyst loading of 0.1 mgcm−2 and 10 mgcm−2 respectively. Cost assessments related to the catalyst performance are presented. An increase in catalyst utilization led to an increase in power generated with a substantial increase in the whole costs. Also a decrease in performance due to cathode/catalyst deterioration over time led to a further increase in the costs.

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Section: Introductionmentioning

confidence: 99%

Power generation in microbial fuel cells using platinum group metal-free cathode catalyst: Effect of the catalyst loading on performance and costs

Santoro

Kodali

Herrera

et al. 2018

Journal of Power Sources

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“…Oxygen reduction reaction (ORR) suffers from numerous severe limitations when it occurs in neutral media, and therefore an optimization of the catalyst is needed to accelerate the process [8] , [9] , [10] . First, high activation overpotentials exist, being as high as 50–100 mV when enzymes are utilized [11] , [12] , [13] , [14] , 200–300 mV in the case of platinum based group metal (PGM) catalysts [15] , [16] or platinum group metal-free (PGM-free) catalysts [17] , [18] , [19] , [20] , [21] , [22] , and even larger in the case of bacterial catalyst [23] , [24] , [25] or carbonaceous materials [26] , [27] , [28] , [29] , [30] , [31] , [32] , [33] . Second, the ORR reaction kinetics is very slow mainly due to the neutral pH, in which both H + and OH − are present in low concentration and both of them participate directly as reactants of ORR, the first one via the acidic pathway and the second one via the alkaline pathway [5] , [6] , [25] .…”

Section: Introductionmentioning

confidence: 99%

Influence of platinum group metal-free catalyst synthesis on microbial fuel cell performance

Santoro

Rojas‐Carbonell

Awais

et al. 2018

Journal of Power Sources

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Platinum group metal-free (PGM-free) ORR catalysts from the Fe-N-C family were synthesized using sacrificial support method (SSM) technique. Six experimental steps were used during the synthesis: 1) mixing the precursor, the metal salt, and the silica template; 2) first pyrolysis in hydrogen rich atmosphere; 3) ball milling; 4) etching the silica template using harsh acids environment; 5) the second pyrolysis in ammonia rich atmosphere; 6) final ball milling. Three independent batches were fabricated following the same procedure. The effect of each synthetic parameters on the surface chemistry and the electrocatalytic performance in neutral media was studied. Rotating ring disk electrode (RRDE) experiment showed an increase in half wave potential and limiting current after the pyrolysis steps. The additional improvement was observed after etching and performing the second pyrolysis. A similar trend was seen in microbial fuel cells (MFCs), in which the power output increased from 167 ± 2 μW cm−2 to 214 ± 5 μW cm−2. X-ray Photoelectron Spectroscopy (XPS) was used to evaluate surface chemistry of catalysts obtained after each synthetic step. The changes in chemical composition were directly correlated with the improvements in performance. We report outstanding reproducibility in both composition and performance among the three different batches.

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“…Many carbon‐ or metal‐based electrode materials are known for BES . Also combinations of different electrode types, for example carbon mesh combined with graphite fiber brushes, have been investigated . A systematic screening of electrode materials for a MFC with S. oneidensis was done with carbon‐based anode materials in the past.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Shewanella oneidensis MR‐1 to the electrode material activated carbon fabric

Mayer

Stöckl

Krieg

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Electroactive microorganisms generate current in microbial fuel cells by oxidizing organic compounds and transferring the electrons to an anode. Thereby the adsorption of cells to the electrode is the first step in the process of biofilm formation. RESULTS A comparison of different electrode materials showed that activated carbon fabric has the best cell adsorption properties for the simple and strong attachment of Shewanella oneidensis cells to the electrode material under aerobic and non‐electrochemical conditions. A preadsorbed anode (20 cm2) contained 18 mg of cell biomass (OD600 = 0.3) and reached a current density of 4.25 μA cm−2. Under anaerobic conditions the adsorption to the activated carbon fabric was much less, however the current density was with 6.5 μA cm−2 (OD600 = 0.3) and 7.75 μA cm−2 (OD600 = 0.9) higher as under aerobic adsorption conditions. CONCLUSION Activated carbon fabric is, due to its cell adsorption property and electrical conductivity, good for MFC applications. The material allows cell reproduction directly on the anode which is important for single‐ or multi‐layer biofilm formation. © 2018 Society of Chemical Industry

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Combined carbon mesh and small graphite fiber brush anodes to enhance and stabilize power generation in microbial fuel cells treating domestic wastewater

Cited by 78 publications

References 33 publications

Power generation in microbial fuel cells using platinum group metal-free cathode catalyst: Effect of the catalyst loading on performance and costs

Power generation in microbial fuel cells using platinum group metal-free cathode catalyst: Effect of the catalyst loading on performance and costs

Influence of platinum group metal-free catalyst synthesis on microbial fuel cell performance

Adsorption of Shewanella oneidensis MR‐1 to the electrode material activated carbon fabric

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