KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Enhancing the power performance of sediment microbial fuel cells by novel strategies: Overlying water flow and hydraulic-driven cathode rotating | |
Guo, Fei1,2; Shi, Zongyang1; Yang, Kaiming1; Wu, Yan1; Liu, Hong2
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| 2019-08-15 | |
| 摘要 | Sediment microbial fuel cells (SMFCs) are promising power sources for environmental monitoring in remote areas and environment-friendly solutions to liver sediment contamination. However, cathodic limitations will significantly decrease power performance and limit its practical application. In this work, the control SMFC (SMFC-C) with cathode horizontally and fully submerged below the overlying water, and the hydraulic-driven rotating cathode SMFC (SMFC-R) was constructed. Overlying water flow and hydraulic-driven cathode rotating as novel strategies for SMFCs towards field applications were proposed. Results demonstrated that better power performance under static condition was obtained in SMFC-R than in SMFC-C, that the overlying water flow could significantly increase the maximum power density (MPD) in SMFC-C over the static condition, and that the cathode rotating further improved MPD in SMFC-R. The MPD obtained under static condition were 26.5 mW/m(2) and 45.1 mW/m(2) in SMFC-C and SMFC-R, which increased to 38.8 mW/m(2)and 47.3 mW/m(2 )under water flow and cathode rotating condition, respectively. Analyses on cathode potential, overlying water pH and dissolved oxygen suggested severe cathodic limitations in SMFC-C under static condition which could be diminished by overlying water flow. However, almost no such limitations were observed in SMFC-R even under static condition, which is probably due to the fact that the cathodic oxygen reaction in SMFC-R mainly occurred on the cathode exposed to the air rather than on that submerged below the water. Identical anode performance was obtained in both SMFCs under different conditions, which were not an influencing factor leading to different power performance (C) 2019 Elsevier B.V. All rights reserved. |
| 关键词 | Sediment microbial fuel cells Hydraulic-driven rotating cathode Overlying water flow Diminishing cathodic limitations Microbial community |
| DOI | 10.1016/j.scitotenv.2019.04.439 |
| 发表期刊 | SCIENCE OF THE TOTAL ENVIRONMENT
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| ISSN | 0048-9697 |
| 卷号 | 678页码:533-542 |
| 收录类别 | SCI |
| WOS记录号 | WOS:000468618900050 |
| 语种 | 英语 |
