A novel structure of scalable air-cathode without Nafion and Pt by rolling activated carbon and PTFE as catalyst layer in microbial fuel cells
A novel structure of scalable air-cathode without Nafion and Pt by rolling activated carbon and PTFE as catalyst layer in microbial fuel cells
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通过滚动活性炭和PTFE作为微生物燃料电池中的催化剂层，一种不含Nafion和Pt的可扩展空气阴极的新型结构
DOI：
10.1016/j.watres.2012.08.005
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发表时间：
2012-11-01
期刊：
影响因子：
12.8
通讯作者：
Feng, Junli
中科院分区：
文献类型：
--
作者：
Dong, Heng;Yu, Hongbing;Feng, Junli
单室空气阴极微生物燃料电池（MFC）有望扩大规模，成为可持续的废水处理系统。然而，目前通过在碳基体上刷涂贵金属催化剂和Nafion粘合剂制成的空气阴极由于成本高、耗费大量劳动力且精度较低，成为MFC进一步发展的最大瓶颈之一。这里通过滚动活性炭（AC）和聚四氟乙烯（PTFE）作为催化剂层构建了一种新颖的空气阴极结构，通过优化的三相界面（TPI）来增强再现性并改善性能。制备了催化剂层AC/PTFE比例为3、5、6、8和11的空气阴极，并采用物理和电化学技术研究了其表面微观结构和电化学特性。从所有阴极的催化剂层观察到均匀的交联粘稠网络，并且随着AC/PTFE比率的降低而增加，而交换电流与该比率呈正相关。最大功率密度 (MPD) 降低如下：AC/PTFE = 6 (802 mW m(-2) @ 3.4 A m(-2))、5 (704 mW m(-2) @ 2.2 mA m(-2))、8 (647 mW m(-2) @ 2.2 A m(-2))、3 (597 mW m(-2) @ 2.1 A米(-2)) 和 11 (584 mW m(-2) at 2.0 mA m(-2))，根据电化学阻抗谱（EIS）分析，这是由于电容特性和电导率的变化所致。这项研究表明，可以通过轧制方法生产廉价、高度可重复、高性能和可扩展的空气阴极，而无需使用贵金属和昂贵的粘合剂。 (C) 2012 Elsevier Ltd. 保留所有权利。
Single chambered air-cathode microbial fuel cells (MFCs) are promising to be scaled up as sustainable wastewater treatment systems. However, the current air-cathode made by brushing noble metal catalyst and Nafion binder onto carbon matrix becomes one of the biggest bottlenecks for the further development of MFCs due to its high cost, huge labor-consuming and less accuracy. A novel structure of air-cathode was constructed here by rolling activated carbon (AC) and polytetrafluoroethylene (PTFE) as catalyst layer to enhance the reproducibility and improve the performance by an optimized three-phase interface (TPI). Air-cathodes with AC/PTFE ratios of 3, 5, 6, 8 and 11 in the catalyst layer were prepared, and the physical and electrochemical techniques were employed to investigate their surface microstructure and electrochemical characteristics. Uniform cross-linked ropiness networks were observed from the catalyst layer of all the cathodes and increased as the AC/PTFE ratio decreased, while the exchange currents were positively related to this ratio. Maximum power densities (MPDs) decreased as follows: AC/PTFE = 6 (802 mW m(-2) at 3.4 A m(-2)), 5 (704 mW m(-2) at 2.2 mA m(-2)), 8 (647 mW m(-2) at 2.2 A m(-2)), 3 (597 mw m(-2) at 2.1 A m(-2)) and 11 (584 mW m(-2) at 2.0 mA m(-2)), which was due to the changes of both the capacitance characteristics and conductivities according to the electrochemical impedance spectrum (EIS) analysis. This study demonstrated that inexpensive, highly reproducible, high performance and scalable air-cathode can be produced by rolling method without using noble metal and expensive binder. (C) 2012 Elsevier Ltd. All rights reserved.