State Key Laboratory of Clean Energy, Department of Energy Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.
Bioprocess Biosyst Eng. 2022 Feb;45(2):269-277. doi: 10.1007/s00449-021-02658-9. Epub 2021 Oct 24.
External resistance is important for the anode and cell performance. However, little attentions were paid on the effect of external resistance on the variation of biofilm structure. Here, we used external resistance ranged from 4000 to 500 Ω for anodic acclimation to investigate the correlation between anode performance and biofilm structure. With the reduce of external resistance, the maximum current density of anode increased from 1.0 to 3.4 A/m, which was resulted from a comprehensive effect of reduced charge transfer resistance and increased diffusion resistance. Biological analysis showed that with the reduce of external resistance, biomass and extracellular polymeric substances content increased by 109 and 286%, cell viability increased by 22.7%, which contributed to the reduced charge transfer resistance. But the porosity of anodic biofilm decreased by 27.8%, which led to an increased diffusion resistance of H. This work provided a clear correlation between the electrochemical performance and biofilm structure.
外部电阻对阳极和电池性能很重要。然而，人们很少关注外部电阻对生物膜结构变化的影响。在这里，我们使用范围从 4000 到 500 欧姆的外部电阻进行阳极驯化，以研究阳极性能和生物膜结构之间的相关性。随着外部电阻的降低，阳极的最大电流密度从 1.0 增加到 3.4 A/m，这是由于电荷转移电阻降低和扩散阻力增加的综合作用。生物分析表明，随着外部电阻的降低，生物量和细胞外聚合物物质的含量分别增加了 109%和 286%，细胞活力增加了 22.7%，这有助于降低电荷转移电阻。但是阳极生物膜的孔隙率降低了 27.8%，导致 H 的扩散阻力增加。这项工作清楚地表明了电化学性能和生物膜结构之间的相关性。
