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Materials 2018, 11(1), 71; https://doi.org/10.3390/ma11010071

Using Electrospinning-Based Carbon Nanofiber Webs for Methanol Crossover Control in Passive Direct Methanol Fuel Cells

School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
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Received: 1 December 2017 / Revised: 29 December 2017 / Accepted: 2 January 2018 / Published: 4 January 2018
(This article belongs to the Section Porous Materials)
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Abstract

Methanol crossover (MCO) significantly affects the performance of a direct methanol fuel cell (DMFC). In order to reduce its effect, this study presents in-house carbon nanofiber webs (CNWs) used as a porous methanol barrier for MCO control in a passive DMFC. The CNW is made from polyacrylonitrile (PAN) by using electrospinning and heat treatment. The impacts of PAN concentration and carbonizing temperature on the material properties are considered. The concentration of PAN has a great effect on the micro structures of the CNWs since a higher concentration of PAN leads to a larger nanofiber diameter and lower porosity. A higher carbonizing temperature helps promote the sample conductivity. The use of CNWs has twofold effects on the cell performance. It helps significantly enhance the cell performance, especially at a low methanol concentration due to its balanced effect on reactant and product management. There is an increase in peak power density of up to 53.54% when the CNW is used, in contrast with the conventional DMFC at 2 mol/L. The dynamic and constant-load performances of the fuel cell based on CNWs are also investigated in this work. View Full-Text
Keywords: direct methanol fuel cell; passive; methanol crossover; carbon nanofiber webs; electrospinning direct methanol fuel cell; passive; methanol crossover; carbon nanofiber webs; electrospinning
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Yuan, W.; Fang, G.; Li, Z.; Chen, Y.; Tang, Y. Using Electrospinning-Based Carbon Nanofiber Webs for Methanol Crossover Control in Passive Direct Methanol Fuel Cells. Materials 2018, 11, 71.

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