化学学报 ›› 2016, Vol. 74 ›› Issue (3): 271-276.DOI: 10.6023/A15100687 上一篇    下一篇

研究论文

双极界面聚合物膜燃料电池Ⅱ:阴极催化层结构优化

徐鑫, 彭思侃, 张劲, 卢善富, 相艳   

  1. 北京航空航天大学空间与环境学院 仿生能源材料与器件北京市重点实验室 北京 100191
  • 收稿日期:2015-10-31 出版日期:2016-03-15 发布日期:2016-01-29
  • 通讯作者: 卢善富, 相艳 E-mail:lusf@buaa.edu.cn;xiangy@buaa.edu.cn
  • 基金资助:

    项目受国家自然科学基金(No. U1137602)、北京市自然科学基金(No. 2132051)和国家科技部863项目(No. 2013AA031902)资助.

Bipolar Interfacial Polyelectrolyte Membrane Fuel Cell Ⅱ: Optimization of Cathode Catalyst Layer

Xu Xin, Peng Sikan, Zhang Jin, Lu Shanfu, Xiang Yan   

  1. School of Space & Environment, Beihang University, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, Beijing 100191
  • Received:2015-10-31 Online:2016-03-15 Published:2016-01-29
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No. U1137602), and Natural Science Foundation of Beijing (No. 2132051), National High Technology Research and Development Program of China (2013AA031902).

以薄层亲水电极或者厚层憎水电极作为双极燃料电池(BPFC)阴极, 系统考察了薄层亲水阴极中季铵化聚砜(QAPSF)含量、厚层憎水电极中聚四氟乙烯(PTFE)含量对电池性能的影响. 结果表明, 采用薄层亲水阴极时, 催化层中QAPSF的最佳含量是20 wt%, 室温下BPFC的最大输出功率达到186.1 mW/cm2. 采用厚层憎水电极时, 催化层中PTFE的合适含量是20 wt%, 40 ℃时BPFC的最大输出功率达到461.5 mW/cm2. 由于碱性阴极对排水的需求较高, 厚层憎水电极相较于薄层亲水电极在BPFC中更有优势.

关键词: 阴极催化层, 聚四氟乙烯, 季铵化聚砜, 聚合物膜, 双极燃料电池

Bipolar fuel cell (BPFC) is a new kind polymer electrolyte membrane fuel cell (PEMFC) with acidic-alkaline bipolar interface formed by acidic and alkaline polyelectrolyte both used in one cell. BPFC has shown some novel characterizations: (1) water generated at the bipolar interface would provide the possibility to devise self-humidification over the entire cell, which would simplify the water manager system; (2) alkaline cathode with facilitated electrokinetics allows for the use of lower catalyst loading or non-noble catalysts, such as silver and nickel. In our previous work, the effect of bipolar membrane electrode configuration on the cell output performance was evaluated and the optimal configuration was achieved. The BPFC with optimal membrane electrode configuration has been operated under completely self-humidifying conditions for prolonged periods successfully. However, there exists a big gap with the cell performance between BPFC and the state-of-art PEMFC. In order to improve the fuel cell performance, optimization of the membrane electrode configurations and further advances in fabricating bipolar interface had been conducted in our previous work. Another issue that affects the performance of the fuel cell is the structure and composition of the catalyst layer. Since the oxygen reduction reaction (ORR) at cathode influenced the fuel cell performance a lot, the improvement of electrode was mainly focused on the cathode catalyst layer. In the present work, thin hydrophilic electrode and thick hydrophobic electrode were used as cathode for BPFC. The influence of ionomer binder, quaternary ammonium polysulfone (QAPSF) in thin hydrophilic electrode and polytetrafluoroethylene (PTFE) in thick hydrophobic electrode, concentration on BPFC performance was studied. The results indicated that the optimal content of QAPSF in thin hydrophilic cathode was 20 wt%, and the peak power density of BPFC reached to 186.1 mW/cm2 at 25 ℃ without humidification. While the PTFE in the thick hydrophobic cathode was also 20 wt% with a peak power density of 461.5 mW/cm2 at 40 ℃ without humidification. Due to the high demand of alkaline cathode for drainage, the thick hydrophobic electrode behaved better than thin hydrophilic electrode in BPFC.

Key words: cathode catalyst layer, polytetrafluoroethylene, quaternized polysulfone, polyelectrolyte membrane, bipolar fuel cell