Enhanced electricity generation and effective water filtration using graphene-based membrane air-cathodes in microbial fuel cells
| Autor: | Weihua He, Jia Liu, Xiangru Song, Bruce E. Logan, Youpeng Qu, Yujie Feng, Qing Jiang |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Microbial fuel cell Renewable Energy Sustainability and the Environment Graphene Chemical oxygen demand Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences law.invention Electricity generation Wastewater Chemical engineering law medicine Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Effluent Activated carbon medicine.drug |
| Zdroj: | Journal of Power Sources. 395:221-227 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2018.05.043 |
| Popis: | Air-cathodes in microbial fuel cells that can also filter wastewater provide the dual benefits of electricity production and reduction of the effluent chemical oxygen demand. Air-cathodes prepared using a novel activated carbon/graphene membrane (2, 5 or 10% graphene by weight) prepared by phase inversion have good conductivities (5.6 ± 0.5 to 7.3 ± 0.6 mS cm−1) compared to control (3.0 ± 0.4 mS cm−1, activated carbon, no graphene). The cathode with 5 wt% graphene produces the highest maximum power density of 1460 ± 10 mW m−2, which is 58% higher than that the control (928 ± 8 mW m−2). The increased power is due to an 88% reduction in charge transfer resistance of 6.0 ± 0.3 Ω (cathode with 5 wt% graphene) compared to the control. Following a cycle of treatment and current generation, 60 ± 1% of the chemical oxygen demand is removed from the remaining chemical oxygen demand, producing an effluent chemical oxygen demand concentration of 20 ± 1 mg L−1. Biomass (4.99 ± 0.02 mg-protein cm−2) is decreased by 33% compared to the control. These results demonstrate that cathodes made with graphene can produce electricity and a high quality effluent with low cathode biofouling. |
| Databáze: | OpenAIRE |
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