Yang Yonggang, Yan Lei, Song Jianhua, Xu Meiying
Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology 510070 Guangzhou China
State Key Laboratory of Applied Microbiology Southern China 510070 Guangzhou China.
RSC Adv. 2018 Jul 16;8(45):25319-25324. doi: 10.1039/c8ra05069d.
Sediment microbial fuel cells (SMFCs) is a promising technology for bioremediation, environmental monitoring and remote power supply in various water environments. Optimizing the anode/cathode surface area ratio (SAR) is important to enhance the power and decrease the cost of SMFCs. However, in fact, little information has been reported to optimize the SAR of SMFCs in individual or stacked mode. This study comparatively analyzed the effects of electrode surface areas on the performance of single SMFCs and serial SMFC-stacks under separated- and connected-hydraulic conditions. The results suggested an optimal SAR of 1 to 1.33 for both single and serial stacked SMFCs. Voltage reversal occurred in serial SMFC stacks with unoptimal SAR but not in optimized stacks. The more the SAR deviated from the optimal SAR, the more easily the voltage reversal occurred ( lower reversal current). Compared to a separated-hydraulic environment, a connected-hydraulic environment showed no effect on the power generation of anode-limiting SMFC stacks but decreased the power generation and reversal current of cathode-limiting SMFCs, probably due to larger parasitic current. The results are important for the scale-up and application of SMFCs.
沉积物微生物燃料电池（SMFCs）是一种在各种水环境中用于生物修复、环境监测和远程供电的有前景的技术。优化阳极/阴极表面积比（SAR）对于提高SMFCs的功率和降低成本至关重要。然而，事实上，关于在单个或堆叠模式下优化SMFCs的SAR的报道很少。本研究比较分析了电极表面积对分离式和连接式水力条件下单个SMFCs和串联SMFC堆叠性能的影响。结果表明，单个和串联堆叠的SMFCs的最佳SAR均为1至1.33。在SAR未优化的串联SMFC堆叠中会发生电压反转，但在优化的堆叠中不会。SAR偏离最佳SAR越多，电压反转就越容易发生（反转电流越低）。与分离式水力环境相比，连接式水力环境对阳极限制型SMFC堆叠的发电没有影响，但会降低阴极限制型SMFCs的发电和反转电流，这可能是由于寄生电流较大。这些结果对于SMFCs的扩大规模和应用具有重要意义。
