期刊
JOURNAL OF POWER SOURCES
卷 317, 期 -, 页码 143-152出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.03.103
关键词
Microbial fuel cell; Proton exchange membrane; Sulfonated polybenzimidazole; Proton transport; Water nanochannels
资金
- SERB, Govt. of India [SB/S1/PC-054/2013]
- CSIR
- Department of Science and Technology (DST), Government of India [DST/IMRCO/New INDIGO/Bio-e-MAT/2014/(G/ii)]
Although microbial fuel cells (MFCs) represent a promising bio-energy technology with a dual advantage (i.e., electricity production and waste-water treatment), their low power densities and high installation costs are major impediments. To address these bottlenecks and replace highly expensive Nafion, which is a proton exchange membrane (PEM), the current study focuses for the first time on membranes made from an easily synthesizable and more economical oxy-polybenzimidazole (OPBI) and its sulfonated analogue (S-OPBI) as alternate PEMs in single-chambered MFCs. The S-OPBI membrane exhibits better properties, with high water uptake, ion exchange capacity (IEC) and proton conductivity and a comparatively smaller degree of swelling compared to Nafion. The membrane morphology is characterized by atomic force microscopy, and the bright and dark regions of the S-OPBI membrane reveals the formation of ionic domains in the matrix, forming continuous water nanochannels when doped with water. These water-filled nanochannels are responsible for faster proton conduction in S-OPBI than in Nafion; therefore, the power output in the MFC with S-OPBI as the PEM is higher than in other MFCs. The open circuit voltage (460 mV), current generation (2.27 mA) and power density profile (110 mW/m(2)) as a function of time, as well as the polarization curves, exhibits higher current and power density (87.8 mW/m(2)) with S-OPBI compared to Nafion as the PEM. (C) 2016 Elsevier B.V. All rights reserved.
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