Trace heavy metal ions promoted extracellular electron transfer and power generation by Shewanella in microbial fuel cells
Trace heavy metal ions promoted extracellular electron transfer and power generation by Shewanella in microbial fuel cells
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微量重金属离子促进微生物燃料电池中希瓦氏菌的细胞外电子转移和发电
DOI：
10.1016/j.biortech.2016.03.144
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发表时间：
2016
影响因子：
11.4
通讯作者：
Yong Yang-Chun
中科院分区：
文献类型：
--
作者：
Xu Yu-Shang;Zheng Tao;Yong Xiao-Yu;Zhai Dan-Dan;Si Rong-Wei;Li Bing;Yu Yang-Yang;Yong Yang-Chun
微生物燃料电池（Microbial Fuel Cells，MFCs）被认为是最有前途的可再生能源获取技术之一，但其低功率输出仍是制约其进一步发展的瓶颈之一。在这项工作中，发现Cu 2+（0.1 μg L−1-0.1 mg L−1）或Cd 2+（0.1 μg L−1-1 mg L−1）显著提高MFC的发电量。在微量Cu ~（2+）（~ 6 nM）或Cd ~（2+）（~ 5 nM）的条件下，最大输出功率分别是对照的1.3倍和1.6倍。进一步的分析证实，添加Cu 2+或Cd 2+可以有效地提高核黄素的产量和细菌在电极上的附着，从而增强MFC中细菌的胞外电子传递（EET）。这些结果揭示了添加Cu 2+或Cd 2+提高MFC输出功率的机理，并表明添加金属离子是一种很有前途的提高MFC EET和发电能力的策略。
Although microbial fuel cells (MFCs) is considered as one of the most promising technology for renewable energy harvesting, low power output still accounts one of the bottlenecks and limits its further development. In this work, it is found that Cu2+(0.1 μg L−1–0.1 mg L−1) or Cd2+(0.1 μg L−1–1 mg L−1) significantly improve the electricity generation in MFCs. The maximum power output achieved with trace level of Cu2+(∼6 nM) or Cd2+(∼5 nM) is 1.3 times and 1.6 times higher than that of the control, respectively. Further analysis verifies that addition of Cu2+or Cd2+effectively improves riboflavin production and bacteria attachment on the electrode, which enhances bacterial extracellular electron transfer (EET) in MFCs. These results unveil the mechanism for power output enhancement by Cu2+or Cd2+addition, and suggest that metal ion addition should be a promising strategy to enhance EET as well as power generation of MFCs.