Electrochemical Study on Electron Transfer Process between Electricigens and Single Crystal Pyrite in a Dual-Chambered Equipment
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摘要: 通过构建产电微生物—黄铁矿双室体系, 应用电化学方法对以黄铁矿单晶电极作为产电微生物电子受体时, 两者间的电子转移过程进行表征和分析.结果显示, 与惰性石墨电极相比, 以黄铁矿单晶作为产电微生物电子受体时, 体系最大功率密度提升132.9%;电化学阻抗谱显示, 黄铁矿单晶电极极化电阻降低98.8%, 表现出优良的电化学反应特性, 表明产电微生物与黄铁矿单晶间具有良好的电子转移活性.籍由产电微生物对底物的氧化作用, 与黄铁矿单晶接受产电微生物电子在0.34 V(相对于饱和甘汞电极)处发生的还原反应, 构成了两者间完整的协同电子转移过程.Abstract: This research built up a dual-chambered electricigens-pyrite equipment. Using single crystal pyrite as electron acceptor of electricigens, and the electron transfer process was analyzed by electrochemical methods. Compared with graphite electrode, the maximum system power density increased by 132.9% and polarization resistance of EIS decreased by 98.8% with a single crystal pyrite electrode. The data show a favorable electron transfer activity between electricigens and single crystal pyrite. The electron transfer process is related to the two electrode reactions, of which one is microbial oxidation by electricigens, and the other is reduction at 0.34 V (vs. SCE) by single crystal pyrite as electron acceptor.
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Key words:
- pyrite /
- electricigens /
- microbial reduction /
- electrochemisty /
- mineralogy /
- environmental engineering
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图 1 产电微生物—黄铁矿双室研究体系示意
Fig. 1. Schematic diagram of electricigen-pyrite system in a dual-chambered setup
图 2 黄铁矿/石墨电极电流密度-负载曲线
Fig. 2. Current density-out loader curve of pyrite and graphite electrode
图 4 黄铁矿/石墨电极阴极电极电势-电流密度曲线
Fig. 4. Potential-current density curve of pyrite and graphite electrode as cathode
图 5 黄铁矿电极/石墨对照EIS拟合结果
Fig. 5. EIS fitting results of pyrite electrode and graphite as control
图 7 不同溶解氧条件下黄铁矿电极线性扫描伏安结果
Fig. 7. LSV results of pyrite electrode under different DO concentrations
表 1 黄铁矿电极/石墨对照EIS拟合参数
Table 1. Fit parameters for EIS of pyrite electrode and graphite as control
参数 黄铁矿 石墨对照 Rp(Ω) 30.35 2 523 Rs (Ω) 4.059 2.256 C(F) 0.002 475 0.037 26 
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