A novel microbial fuel cell sensor with biocathode sensing element
A novel microbial fuel cell sensor with biocathode sensing element
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DOI：
10.1016/j.bios.2017.02.052
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发表时间：
2017-08-15
影响因子：
12.6
通讯作者：
Huang, Xia
中科院分区：
文献类型：
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作者：
Jiang, Yong;Liang, Peng;Huang, Xia
传统的以生物阳极为敏感元件的微生物燃料电池（MFC）传感器对毒性监测的灵敏度有限，仅适用于厌氧和富有机水体，并增加了对有机物/毒性组合冲击的潜在故障警告。本研究首次将氧还原反应的生物阴极作为MFC毒性监测传感器的敏感元件。结果表明，具有生物阴极传感元件的MFC传感器的灵敏度（7.4 +/- 2.0至67.5 +/- 4.0 mA%（-1）cm（-2））远大于生物阳极传感元件所显示的灵敏度（3.4 +/- 1.5至5.5 +/- 0.7 mA%（-1）cm（-2））。生物阴极传感元件实现了迄今为止使用MFC传感器进行甲醛检测所报道的最低检测限（0.0005%），而生物阳极更适用于更高浓度（> 0.0025%）。随着电导率和溶解氧的增加，生物阴极敏感元件的响应速度加快。生物阴极传感元件使MFC传感器直接应用于清洁水体监测，饮用水和再生水，不需要背景有机物的修正，也减少了有机物/毒性联合冲击时的预警失效。
The traditional microbial fuel cell (MFC) sensor with bioanode as sensing element delivers limited sensitivity to toxicity monitoring, restricted application to only anaerobic and organic rich water body, and increased potential fault warning to the combined shock of organic matter/toxicity. In this study, the biocathode for oxygen reduction reaction was employed for the first time as the sensing element in MFC sensor for toxicity monitoring. The results shown that the sensitivity of MFC sensor with biocathode sensing element (7.4 +/- 2.0 to 67.5 +/- 4.0 mA%(-1) cm(-2)) was much greater than that showed by bioanode sensing element (3.4 +/- 1.5 to 5.5 +/- 0.7 mA%(-1) cm(-2)). The biocathode sensing element achieved the lowest detection limit reported to date using MFC sensor for formaldehyde detection (0.0005%), while the bioanode was more applicable for higher concentration ( > 0.0025%). There was a quicker response of biocathode sensing element with the increase of conductivity and dissolved oxygen (DO). The biocathode sensing element made the MFC sensor directly applied to clean water body monitoring, e.g., drinking water and reclaimed water, without the amending of background organic matter, and it also decreased the warning failure when challenged by a combined shock of organic matter/toxicity.