Cathode Catalyst Layer with Stepwise Hydrophobicity Distribution for a Passive Direct Methanol Fuel Cell
Cathode Catalyst Layer with Stepwise Hydrophobicity Distribution for a Passive Direct Methanol Fuel Cell
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DOI：
10.1021/ef201834e
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发表时间：
2012-01
期刊：
影响因子：
5.3
通讯作者：
Mei Chen;Ji Chen;Yuan Li;Qinghong Huang;Haifeng Zhang;Xinzhong Xue;Z. Zou;Hui Yang
中科院分区：
文献类型：
--
作者：
Mei Chen;Ji Chen;Yuan Li;Qinghong Huang;Haifeng Zhang;Xinzhong Xue;Z. Zou;Hui Yang
设计并制备了一种新型的非连续疏水梯度阴极催化剂层，用于被动式直接甲醇燃料电池（DMFC）。疏水性梯度分布有利于阴极催化层内氧的扩散和阴极水的去除，从而提高了DMFC的性能和稳定性。采用上述新型阴极催化层结构的直接甲醇燃料电池在约100 ℃时的最大功率密度为33.5 mW cm-2。在相同的工作条件下，传统结构的DMFC的输出功率仅为27.4 mW cm-2。采用这种新型阴极结构的DMFC性能的提高可能归因于阴极上氧还原反应的电荷转移电阻的降低。
A novel cathode catalyst layer with discontinuous hydrophobicity gradient distribution is designed and fabricated for passive direct methanol fuel cells (DMFCs). The stepwise hydrophobicity distribution is beneficial to the oxygen diffusion inside the cathodic catalytic layer and to the water removal from the cathode, thus improving the performance and stability of the DMFC. The DMFC with the above-mentioned novel cathodic catalytic layer structure presents a maximum power density of 33.5 mW cm–2 at a temperature of ca. 25 °C, while the DMFC with a conventional structure only gives 27.4 mW cm–2 under the same operating conditions. The enhanced performance of the DMFC with such a novel cathode structure might be attributed to a decreased charge-transfer resistance for the oxygen reduction reaction on the cathode.