Improvement of direct methanol fuel cell performance by modifying catalyst coated membrane structure
Improvement of direct methanol fuel cell performance by modifying catalyst coated membrane structure
复制标题
DOI：
10.1016/j.elecom.2005.07.003
复制
发表时间：
2005-10
影响因子：
5.4
通讯作者：
Suli Wang;Gongquan Sun;Guoxiong Wang;Zhen-hua Zhou;Xinsheng Zhao;Hai Sun;X. Fan;B. Yi;Q. Xin
中科院分区：
文献类型：
--
作者：
Suli Wang;Gongquan Sun;Guoxiong Wang;Zhen-hua Zhou;Xinsheng Zhao;Hai Sun;X. Fan;B. Yi;Q. Xin
通过在膜和催化剂层之间引入改性Nafion层，设计并制造了基于Nafion 115膜的直接甲醇燃料电池（DMFC）五层催化剂涂层膜（CCM）。 CCM 的性能通过 SEM、循环伏安法、阻抗谱、破坏性测试和 I-V 曲线来确定。表征表明，改性的 Nafion 层提供了增加的界面接触面积并增强了膜与催化剂层之间的相互作用。结果，实现了膜电极组件更高的Pt利用率、更低的接触电阻和优异的耐久性。使用新型CCM结构获得了75%的Pt利用效率，而传统结构的效率为60%。所有这些特性都极大地促进了 DMFC 性能的提高。采用新型CCM结构的DMFC的最大功率密度为260mWcm−2，而采用传统结构的DMFC在相同的工作条件下仅给出200mWcm−2。
A five-layer catalyst coated membrane (CCM) based upon Nafion 115 membrane for direct methanol fuel cell (DMFC) was designed and fabricated by introducing a modified Nafion layer between the membrane and the catalyst layer. The properties of the CCM were determined by SEM, cyclic voltammetry, impedance spectroscopy, ruinous test and I–V curves. The characterizations show that the modified Nafion layers provide increased interface contact area and enhanced interaction between the membrane and the catalyst layer. As a result, higher Pt utilization, lower contact resistance and superior durability of membrane electrode assembly was achieved. A 75% Pt utilization efficiency was obtained by using the novel CCM structure, whereas the conventional structure gave 60% efficiency. All these features greatly contribute to the increase in DMFC performance. The DMFC with new CCM structure presented a maximum power density of 260mWcm−2, but the DMFC with conventional structure gave only 200mWcm−2under the same operation condition.