A High-Performance Gas-Fed Direct Ammonia Hydroxide Exchange Membrane Fuel Cell,ACS Energy Letters

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A High-Performance Gas-Fed Direct Ammonia Hydroxide Exchange Membrane Fuel Cell
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-04-30 , DOI: 10.1021/acsenergylett.1c00370
Yun Zhao ₁ , Teng Wang ₁ , Brian P. Setzler ₁ , Reza Abbasi ₁ , Junhua Wang ₁ , Yushan Yan ₁

Affiliation

Recently, ammonia has become more attractive for carbon-neutral transportation. Both aqueous ammonia and gaseous ammonia can be utilized for direct ammonia hydroxide exchange membrane fuel cells (DAFCs). Using aqueous ammonia as feedstock for DAFCs presents significant drawbacks to practical stack operations, including higher ammonia crossover rate, increased probability of cathode flooding, and shunt currents. These drawbacks make gaseous ammonia the ideal feedstock for DAFCs. However, the main obstacle to adopting gas-fed DAFCs is their poor performance. Here, we demonstrate that anode humidity and operating temperature are two key factors impacting the performance of gas-fed DAFCs. For the first time, we also investigated the ammonia oxidation reaction (AOR) kinetics in liquid-base-free media at DAFC relevant temperatures and developed a kinetic model for the AOR under these DAFC applicable conditions. Finally, we constructed a one-dimensional (1-D) porous electrode model, simulated the polarization curves, and determined the sources of performance loss for gas-fed DAFCs.

中文翻译：

高性能气供氢直接氢氧化铵交换膜燃料电池

近来，氨气对于碳中和运输变得越来越有吸引力。氨水和气态氨均可用于直接氨氢氧化物交换膜燃料电池（DAFC）。使用氨水作为DAFC的原料给实际的烟囱操作带来了明显的缺点，包括更高的氨交换速率，增加的阴极溢流可能性和分流电流。这些缺点使气态氨成为DAFC的理想原料。但是，采用燃气DAFC的主要障碍是其性能差。在这里，我们证明了阳极湿度和工作温度是影响充气DAFC性能的两个关键因素。首次，我们还研究了DAFC相关温度下无液基介质中氨氧化反应（AOR）的动力学，并开发了在这些DAFC适用条件下AOR的动力学模型。最后，我们构建了一维（1-D）多孔电极模型，模拟了极化曲线，并确定了气源DAFC的性能损失来源。

更新日期：2021-05-14

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