Structure optimization of cathode microporous layer for direct methanol fuel cells
Structure optimization of cathode microporous layer for direct methanol fuel cells
复制标题
DOI：
10.1016/j.apenergy.2015.03.021
复制
发表时间：
2015-06
期刊：
影响因子：
11.2
通讯作者：
Guicheng Liu;X. Ding;Hongwei Zhou;Ming Chen;Manxiang Wang;Zhenxuan Zhao;Zhuang Yin;Xindong Wang
中科院分区：
文献类型：
--
作者：
Guicheng Liu;X. Ding;Hongwei Zhou;Ming Chen;Manxiang Wang;Zhenxuan Zhao;Zhuang Yin;Xindong Wang
为了获得具有高传质性能和高电子电导率的阴极微孔层（CML），引入造孔技术来优化直接甲醇燃料电池的CML微观结构。本文系统地讨论了CML中碳材料类型、碳材料负载量和成孔剂负载量对燃料电池性能的影响。结果表明，优化的 CML 由碳纳米管和草酸铵组成，负载量分别为 1.5 mg cm−2 和 3.5 mg cm−2。在 80 °C、0.3 MPa O2 条件下，燃料电池性能提高了 30.3%，从 224 mW cm−2 提高到 292 mW cm−2。碳纳米管被发现是最适合用于CML的碳材料，因为它具有较大的比表面积和较小的粒径，从而增加了疏水位点的数量以及载体与催化剂层之间的接触面积。碳材料和造孔剂的负载量直接影响膜电极组件的孔分布和接触电阻。通过优化微孔和大孔结构的数量，提高了扩散层的除水能力和气体传质性能。
To obtain the cathode microporous layer (CML) with high mass transfer performance and high electronic conductivity, a pore-forming technology was introduced to optimize CML microstructure for direct methanol fuel cells. In this paper, the effects of carbon material type, carbon material loading and pore-forming agent loading in CML on fuel cell performance were discussed systematically. The results indicated that the optimized CML consisted of carbon nanotubes and ammonium oxalate with the loading of 1.5 and 3.5 mg cm−2respectively. The fuel cell performance was improved by 30.3%, from 224 to 292 mW cm−2at 80 °C under 0.3 MPa O2. Carbon nanotube was found to be the most suitable carbon material for the CML due to its great specific surface area and small particle size, resulting in increasing the number of the hydrophobic sites and the contact area between the support and the catalyst layer. The carbon material and pore-forming agent loading directly influenced the pore distribution and the contact resistance of membrane electrode assembly. The water removal capacity and the gas mass transfer property of diffusion layer were improved by optimizing the amount of micropore and macropore structures.