Improving the performance of direct methanol fuel cells by implementing multilayer membranes blended with cellulose nanocrystals
Improving the performance of direct methanol fuel cells by implementing multilayer membranes blended with cellulose nanocrystals
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DOI：
10.1016/j.ijhydene.2019.09.194
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发表时间：
2019-11-15
影响因子：
7.2
通讯作者：
Holmes, Stuart M.
中科院分区：
文献类型：
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作者：
Hosseinpour, Milad;Sahoo, Madhumita;Holmes, Stuart M.
直接甲醇燃料电池 (DMFC) 质子交换膜的甲醇渗透显着影响其性能和效率。膜的低甲醇渗透性和高质子电导率是获得最佳性能所必需的。在这项工作中，采用了通过简单压制技术制备的多层（ML）膜结构，并结合或不结合喷涂纤维素纳米晶体（CNC）来实现增强的膜性能。组装的多层电解质的最大功率密度提高了 19%，而添加 1.5 wt% CNC（占最终膜总重量的百分比）进一步提高了性能，与标准 Nafion N115 相比，性能提高了 38%。甲醇通量密度和电化学阻抗测量将这些改进归因于多层膜质子电导率的-20%增强，当添加纤维素纳米晶体时，通过甲醇渗透减少11%进一步增强质子电导率。 (C) 2019 年作者。由 Elsevier Ltd 代表 Hydrogen Energy Publications LLC 出版。
Methanol crossover through the proton exchange membranes of a direct methanol fuel cell (DMFC) significantly affects its performance and efficiency. Low methanol permeability and high proton conductivity of the membrane is desired for optimum performance. In this work, a multilayer (ML) membrane configuration prepared by a simple pressing technique is employed with and without the incorporation of sprayed cellulose nanocrystals (CNC) to achieve enhanced membrane properties. Assembled multilayer electrolytes show 19% enhanced maximum power density, while the addition of 1.5 wt% CNC (wt % of total final membrane) further improves the performance, giving a 38% better performance compared to standard Nafion N115. Methanol flux density and electrochemical impedance measurements attribute these improvement to the -20% enhancement in the proton conductivity for the multilayer membrane which is enhanced further by an 11% reduction in methanol crossover when the cellulose nanocrystals are added. (C) 2019 The Authors. Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.