Two-dimensional mathematical model of an air-cathode microbial fuel cell with graphite fiber brush anode
Two-dimensional mathematical model of an air-cathode microbial fuel cell with graphite fiber brush anode
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DOI：
10.1016/j.jpowsour.2019.227145
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发表时间：
2019-11
影响因子：
9.2
通讯作者：
Siddharth Gadkari;S. Gu;J. Sadhukhan
中科院分区：
文献类型：
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作者：
Siddharth Gadkari;S. Gu;J. Sadhukhan
建立了一个二维数学模型，用于表征和预测以石墨纤维刷为阳极的空气阴极MFC的动态性能。将刷阳极视为多孔基体，将电荷转移动力学耦合到两个电极处的质量平衡。该模型已被用来研究设计（电极间距和阳极尺寸）以及操作（底物浓度）参数对MFC性能的影响。二维动态模拟可以直观地表示刷式阳极中的局部过电位、电流密度和反应速率，并有助于理解这些因素如何影响MFC的整体性能。数值计算结果表明，虽然减少电极间距和增加初始基板浓度都有积极的影响的MFC的功率密度，减少阳极尺寸不会影响MFC的性能，直到近60%的刷材料已被删除。所提出的数学模型可以帮助指导实验/中试/工业规模的协议，以获得最佳性能。
A two-dimensional mathematical model has been developed for characterizing and predicting the dynamic performance of an air-cathode MFC with graphite fiber brush used as anode. The charge transfer kinetics are coupled to the mass balance at both electrodes considering the brush anode as a porous matrix. The model has been used to study the effect of design (electrode spacing and anode size) as well as operational (substrate concentration) parameters on the MFC performance. Two-dimensional dynamic simulation allows visual representation of the local overpotential, current density and reaction rates in the brush anode and helps in understanding how these factors impact the overall MFC performance. The numerical results show that while decreasing electrode spacing and increasing initial substrate concentration both have a positive influence on power density of the MFC, reducing anode size does not affect MFC performance till almost 60% brush material has been removed. The proposed mathematical model can help guide experimental/pilot/industrial scale protocols for optimal performance.