School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guizhou Academy of Sciences, Shanxi Road 1, Guiyang 550001, PR China; State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
Bioresour Technol. 2020 Jul;307:123198. doi: 10.1016/j.biortech.2020.123198. Epub 2020 Mar 17.
Three materials including stainless steel woven mesh (SSM), nickel foam (NF) and carbon cloth (CC) were conducted as cathode in Cd(II)-reduced microbial electrolysis cells (MECs), respectively. By using electrode potential slope (EPS) method, the experimental open circuit potentials of three cathodes were similar, while the SSM cathode showed the smallest resistance (6 ± 1 mΩ m), following by NF cathode (18 ± 2 mΩ m) and CC cathode (32 ± 5 mΩ m). These values were analyzed to predicte higher current density and more positive cathode potential in the MEC with SSM cathode under subsequent operating conditions. Electrochemical performance was more likely to be limited by current density than cathode potential. Accordingly, the MEC with SSM cathode obtained better system performance than that with other cathodes. This study further expands the application of EPS method that quantitatively evaluating and effectively selecting cathode materials for better system performance in Cd(II)-reduced MECs.
三种材料，包括不锈钢编织网（SSM）、泡沫镍（NF）和碳布（CC），分别作为阴极应用于 Cd(II)还原型微生物电解池（MEC）中。通过使用电极电位斜率（EPS）法，三种阴极的开路电位实验结果相似，而 SSM 阴极的电阻最小（6±1 mΩ m），其次是 NF 阴极（18±2 mΩ m）和 CC 阴极（32±5 mΩ m）。这些值可用于预测在后续操作条件下，具有 SSM 阴极的 MEC 能够实现更高的电流密度和更正的阴极电位。电化学性能更可能受到电流密度的限制，而不是阴极电位。因此，具有 SSM 阴极的 MEC 获得了比其他阴极更好的系统性能。本研究进一步扩展了 EPS 方法的应用，该方法可用于定量评估和有效选择阴极材料，从而在 Cd(II)还原型 MEC 中获得更好的系统性能。
