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首页> 外文期刊>Bioprocess and Biosystems Engineering >Improved power generation using nitrogen-doped 3D graphite foam anodes in microbial fuel cells
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Improved power generation using nitrogen-doped 3D graphite foam anodes in microbial fuel cells

机译：在微生物燃料电池中使用掺氮3D石墨泡沫阳极改善发电

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摘要

The properties of the anode material and structure are critical to the microbial growth and interfacial electron transfer between the biofilm and the anode. In this paper, we prepared the nitrogen-doped 3D expanded graphite foam (NEGF) by simple, rapid and inexpensive methods of liquid nitrogen expansion and hydrothermal treatment from commercial graphite foil (GF). X-ray photoelectron spectroscopy confirmed the success of nitrogen doping on expanded graphite foam (EGF). Using cyclic voltammetry and electrochemical impedance spectroscopy, the NEGF and EGF electrode exhibited increased electrochemical active surface area and fast interfacial electron transfer ability than that of pristine GF, and NEGF electrode performed even better. Scanning electron microscopy revealed that NEGF and EGF possessed graphene-like structure and large surface area. MFCs equipped with NEGF or EGF anodes, respectively, achieved maximum power density of 0.739 and 0.536 W m(-2), which was about 17.4 and 12.6 times larger than that of MFCs with GF anodes (0.0451 W m(-2)). The anode and cathode polarization curves further confirmed that the different anode other than the cathode was responsible for the advanced performance of MFCs. The morphology of the biofilm on three kinds of anodes proved the densest biofilm formed on NEGF anode. All the results indicated the synergistic effect of 3D graphene-like structure and N-doped surface on the performance of MFCs, which might provide special insights into designing simple and efficient route for anode construction to achieve promising electricity generation.
机译：阳极材料和结构的特性对于生物膜和阳极之间的微生物生长和界面电子转移至关重要。在本文中，我们通过简单，快速且廉价的液态氮膨胀和水热处理方法，从商用石墨箔（GF）制备了掺氮3D膨胀石墨泡沫（NEGF）。 X射线光电子能谱证实了在膨胀石墨泡沫（EGF）上氮掺杂的成功。使用循环伏安法和电化学阻抗谱法，NEGF和EGF电极的电化学活性表面积和原始界面GF的能力均高于原始GF，NEGF电极的性能甚至更好。扫描电子显微镜显示，NEGF和EGF具有石墨烯样结构和大表面积。分别配备NEGF或EGF阳极的MFC的最大功率密度分别为0.739和0.536 W m（-2），这比具有GF阳极的MFC（0.0451 W m（-2））的最大功率密度高约17.4和12.6倍。阳极和阴极的极化曲线进一步证实，与阴极不同的阳极是MFC先进性能的原因。三种阳极上生物膜的形态证明了在NEGF阳极上形成的最致密的生物膜。所有结果都表明3D石墨烯状结构和N掺杂表面对MFC的性能具有协同作用，这可能为设计简单有效的阳极构造路线以实现有希望的发电提供特殊见解。

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