An Ag2O/Ag electrode was prepared through the electrochemical oxidation of sterling silver.This electrode was used as a cathodic electron acceptor in a microbial fuel cell(MFC).The Ag2O/Ag electrode was characterized ...An Ag2O/Ag electrode was prepared through the electrochemical oxidation of sterling silver.This electrode was used as a cathodic electron acceptor in a microbial fuel cell(MFC).The Ag2O/Ag electrode was characterized by scanning electron microscopy,X-ray powder diffraction and linear sweep voltammetry.The maximum voltage output of the MFC with the AgaO/Ag cathode was maintained at between 0.47 and 0.5 V in 100 cycles,indicating the good regenerative capacity of the Ag2O/Ag electrode.The overpotential loss for silver oxide was 0.021-0.006 V,and the maximum power output,open circuit potential and short circuit current of the MFC were 1.796 W m^-3,0.559 V and 9.3375 A m^-3,respectively.The energy required for electrochemical reoxidation ranged from 40%to 55%of the energy produced by the MFC.Results indicated that the AgeO/Ag electrode could be used as a cathodic electron acceptor in MFCs with excellent stability.展开更多
A renewable MFC(microbial fuel cell)cathode was used in this study because the iodide ion could react with oxygen to generate triiodide under natural sunlight.The feasibility of the regeneration of triiodide ion under...A renewable MFC(microbial fuel cell)cathode was used in this study because the iodide ion could react with oxygen to generate triiodide under natural sunlight.The feasibility of the regeneration of triiodide ion under natural sunlight and the effect of the regenerated triiodide ion concentration on the MFC performance were studied.The results showed that the power density of the MFC using triiodide ion as cathodic electron acceptor was significantly higher than that of using ferricyanate,and that the iodide ion can be oxidized to triiodide ion by oxygen in air at the expense of natural sunlight.In addition,it was obvious from the experimental results that the MFC performance was improved with the increase of the triiodide concentration,indicating that the concentration of triiodide ion had a critical effect on the MFC performance.The linear sweep voltammetry(LSV)curves for the electro-reduction of triiodide ion on the carbon paper were obtained and the results suggested that the diffusion process of triiodide ions to cathode was the control factor for the MFC performance.展开更多
The effects of inoculum species, substrate concentration, temperature, and cathodic electron acceptors on electricity production of microbial fuel cells （MFCs） were investigated in terms of start-up time and power o...The effects of inoculum species, substrate concentration, temperature, and cathodic electron acceptors on electricity production of microbial fuel cells （MFCs） were investigated in terms of start-up time and power output. When inoculated with aeration tank sludge, this MFC outperformed the cell that was inoculated with anaerobic sludge in terms of start-up time and power output. After running for a certain time period, the dominant populations of the two MFCs varied significantly. Within the tested range of substrate concentration （200-1800 mg L-l）, the voltage output increased and the time span of the electricity generation lengthened with increasing substrate concentration. As the temperature declined from 35 to 10 ℃, the maximum power density reduced from 2.229 to 1.620 W m-3, and anodic polarization resistance correspondingly dropped from 118 to 98 Ω. The voltage output of MFC-Cu2＋ was 0.447 V, which is slightly lower than that achieved with MFC-[Fe（CN）6]3- （0.492 V）, thereby indicating that MFCs could be used to treat wastewater con- taining Cu2＋ pollutant in the cathode chamber with removal of organics in anode chamber and simultaneous electricity generation.展开更多
基金jointly funded by the National Natural Science Foundation of China and Shenhua Group Corp.(Grant No.U1261103)the Natural Science Foundation of Shanxi Province of China(Grant No.201601D011023)
文摘An Ag2O/Ag electrode was prepared through the electrochemical oxidation of sterling silver.This electrode was used as a cathodic electron acceptor in a microbial fuel cell(MFC).The Ag2O/Ag electrode was characterized by scanning electron microscopy,X-ray powder diffraction and linear sweep voltammetry.The maximum voltage output of the MFC with the AgaO/Ag cathode was maintained at between 0.47 and 0.5 V in 100 cycles,indicating the good regenerative capacity of the Ag2O/Ag electrode.The overpotential loss for silver oxide was 0.021-0.006 V,and the maximum power output,open circuit potential and short circuit current of the MFC were 1.796 W m^-3,0.559 V and 9.3375 A m^-3,respectively.The energy required for electrochemical reoxidation ranged from 40%to 55%of the energy produced by the MFC.Results indicated that the AgeO/Ag electrode could be used as a cathodic electron acceptor in MFCs with excellent stability.
基金supported by the National Natural Science Foundation of China(Grant Nos.50806087,90510020,50825602)the Natural Science Foundation of Chongqing(Grant No.CSTC2008BB6176)"211"Program(Grant No.S-09101)
文摘A renewable MFC(microbial fuel cell)cathode was used in this study because the iodide ion could react with oxygen to generate triiodide under natural sunlight.The feasibility of the regeneration of triiodide ion under natural sunlight and the effect of the regenerated triiodide ion concentration on the MFC performance were studied.The results showed that the power density of the MFC using triiodide ion as cathodic electron acceptor was significantly higher than that of using ferricyanate,and that the iodide ion can be oxidized to triiodide ion by oxygen in air at the expense of natural sunlight.In addition,it was obvious from the experimental results that the MFC performance was improved with the increase of the triiodide concentration,indicating that the concentration of triiodide ion had a critical effect on the MFC performance.The linear sweep voltammetry(LSV)curves for the electro-reduction of triiodide ion on the carbon paper were obtained and the results suggested that the diffusion process of triiodide ions to cathode was the control factor for the MFC performance.
基金financially supported by the National Natural Science Foundation of China and Shenhua Group Corp. (Grant No. U1261103)
文摘The effects of inoculum species, substrate concentration, temperature, and cathodic electron acceptors on electricity production of microbial fuel cells （MFCs） were investigated in terms of start-up time and power output. When inoculated with aeration tank sludge, this MFC outperformed the cell that was inoculated with anaerobic sludge in terms of start-up time and power output. After running for a certain time period, the dominant populations of the two MFCs varied significantly. Within the tested range of substrate concentration （200-1800 mg L-l）, the voltage output increased and the time span of the electricity generation lengthened with increasing substrate concentration. As the temperature declined from 35 to 10 ℃, the maximum power density reduced from 2.229 to 1.620 W m-3, and anodic polarization resistance correspondingly dropped from 118 to 98 Ω. The voltage output of MFC-Cu2＋ was 0.447 V, which is slightly lower than that achieved with MFC-[Fe（CN）6]3- （0.492 V）, thereby indicating that MFCs could be used to treat wastewater con- taining Cu2＋ pollutant in the cathode chamber with removal of organics in anode chamber and simultaneous electricity generation.
