高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

高锰酸钾作阴极的微生物燃料电池

詹亚力, 王琴, 闫光绪, 郭绍辉   

  1. 中国石油大学化工学院, 重质油国家重点实验室, 北京 102249
  • 收稿日期:2007-08-08 修回日期:1900-01-01 出版日期:2008-03-10 发布日期:2008-03-10
  • 通讯作者: 詹亚力

Investigation on Microbial Fuel Cell with Permanganate as Cathode

ZHAN Ya-Li*, WANG Qin, YAN Guang-Xu, GUO Shao-Hui   

  1. State Key Laboratory of Heavy Oil Processing, Faculty of Chemical Science and Engineering, China University of Petroleum, Beijing 102249, China
  • Received:2007-08-08 Revised:1900-01-01 Online:2008-03-10 Published:2008-03-10
  • Contact: ZHAN Ya-Li

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被引次数

79

摘要： 构建了一个以醋酸钠水溶液为阳极原料、高锰酸钾为阴极氧化剂的双室微生物燃料电池, 考察了阴极溶液浓度、阴极流动状态、外电阻和pH值等因素对电池性能的影响, 监测了电池外电压和两极电极电势的变化过程, 并分析了阴极极化的原因和限制微生物燃料电池(MFC)的关键因素. 研究结果显示: (1) MnO2在碳纸表面的沉积是阴极极化的主要原因, 而溶液流动可以明显降低极化程度; 将高锰酸钾溶解在缓冲溶液中可以进一步降低阴极H+浓差极化; (2) 根据极化曲线可以推断, 影响电池输出功率的决定性因素应是微生物代谢反应速度和微生物与电极之间的电子传递速率; (3) 随外电阻的变化, 电池输出功率出现极大值824 mW/m2, 相应外电阻为300 Ω左右, 这与通过I-V关系曲线推导得到的电池内阻(284±18) Ω相吻合; (4) pH值和高锰酸钾浓度对电池阴极电极电势的影响符合Nernst方程.

关键词: 微生物燃料电池, 高锰酸钾, 极化曲线, Nernst方程

Abstract: In the present paper a microbial fuel cell(MFC) was constructed with acetate solution as the fuel in anode cell and potassium permanganate as oxidized agent in cathode cell. The influences of the concentration, flowing status and pH value of cathode solution, and outer resistance on the MFC were investigated, outer voltage and electrode potentials were monitored and the influence factors on cathode and cell were analyzed. The results show that: (1) MnO2 deposition on the surface is the main factor resulting in cathode polarization, and the flowing of the solution can remarkably reduce this polarization. Furthermore, the buffered solution can reduce the polarization resulting from H+ concentration difference; (2) it is deduced from the polarization curve that the key factor influencing the performance of MFC is microbial number and metabolic rate and the electron transferring rate from microbial to electrode; (3) the power density arrives at the biggest, 824 mW/m2, when outer resistance is 300 Ω, which is accordance to the inner resistance, (284±18) Ω, deduced from I-V curve; (4) the influences of pH and permanganate concentration on cathode potential is in agreement to Nernst equation.

Key words: Microbial fuel cell, Potassium permanganate, Polarization curve, Nernst equation

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