Asymmetric electrode ionomer for low relative humidity operation of anion exchange membrane fuel cells,Journal of Materials Chemistry A

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Asymmetric electrode ionomer for low relative humidity operation of anion exchange membrane fuel cells
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-07-03 , DOI: 10.1039/d0ta05807f
Daniel P. Leonard _{1,

2,

3,

4} , Sandip Maurya _{1,

2,

3,

4} , Eun Joo Park _{1,

2,

3,

4} , Luis Delfin Manriquez _{1,

2,

3,

4} , Sangtaik Noh _{4,

5,

6,

7} , Xiaofeng Wang _{4,

5,

6,

7} , Chulsung Bae _{4,

5,

6,

7} , Ehren D. Baca _{4,

8,

9,

10} , Cy Fujimoto _{4,

8,

9,

10} , Yu Seung Kim _{1,

2,

3,

4}

Affiliation

The operation of fuel cells under low relative humidity (RH) conditions gives substantial cost and performance benefits. Nonetheless, it is not currently feasible to operate anion exchange membrane fuel cells (AEMFCs) at low RH conditions because current materials for membrane electrode assembly cannot provide sufficient water for the oxygen reduction reaction. Here we synthesized polyfluorene ionomers with different ammonium concentrations for anode and cathode to control water management. We designed several asymmetric electrodes that enable high performance under low RH conditions via not only conventional backward water diffusion (anode to cathode) but also forward diffusion (cathode to anode). The AEMFCs using optimized asymmetric electrodes exhibited high H₂/CO₂-free air performance (rated power density of circa 540 mW cm⁻² at 90 °C under 75% (anode) and 50% RH (cathode) conditions), which is comparable to those of state-of-the-art AEMFCs under nearly water-saturated conditions. The durability of the AEMFCs is excellent, generating 0.6 A cm⁻² for >900 h at 80 °C under 50% RH (cathode) conditions. This study demonstrates that high-performance and durable AEMFCs under low RH and high current generating conditions are possible.

中文翻译：

用于阴离子交换膜燃料电池低相对湿度运行的不对称电极离聚物

燃料电池在低相对湿度（RH）条件下的运行可带来可观的成本和性能优势。尽管如此，目前在低RH条件下操作阴离子交换膜燃料电池（AEMFC）是不可行的，因为用于膜电极组件的现有材料无法为氧还原反应提供足够的水。在这里，我们合成了具有不同铵浓度的聚芴离聚物用于阳极和阴极，以控制水的管理。我们设计了几种不对称电极，它们不仅可以通过常规的向后水扩散（阳极到阴极）而且可以通过正向扩散（阴极到阳极）在低RH条件下实现高性能。使用优化的不对称电极的AEMFC表现出高H ₂ / CO ₂无空气性能（在90％的条件下，在75％（阳极）和50％RH（阴极）的条件下于90°C时的额定功率密度约为540 mW cm ^-2），与最新的AEMFC在以下条件下的性能相当几乎是水饱和的条件。AEMFC的耐久性极佳，在50％RH（阴极）条件下，在80°C下于900 h内产生0.6 A cm ^-2的电流。这项研究表明在低RH和高电流产生条件下高性能和耐用的AEMFC是可能的。

更新日期：2020-07-21

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