The alkaline environment of anion exchange membrane fuel cells (AEMFCs) allows for the use of low-cost catalysts and bipolar plates and has garnered significant attention. However, CO2 in the inlet air can negatively impact cell performance, leading to decreased conductivity and output power. In this study, we developed an inlet gas pre-treatment device that utilizes deep eutectic solvent (DES) for chemical CO2 adsorption. The introduction of reduced graphene oxide (rGO) enabled additional physical adsorption, increasing the adsorption capacity from 0.286 g/g to 0.399 g/g, while realizing photothermal desorption with an efficiency of 94.3 %. Testing in single-cell applications demonstrated the CO2 concentration in the treated gas decreased to 30 ppm within 110 min, increasing the output voltage from 0.727 V to 0.820 V and the current from 29.4 mA to 39.3 mA. The CO2 concentration returned to 400 ppm within 84 min under light, and the output voltage and current reverted to pre-adsorption levels. The effect of O2 content on cell performance was investigated, revealing a direct correlation between the rate of increase in output current and voltage with O2 partial pressure. The employment of the developed CO2 removal device extended the operational lifespan of the external load.

中文翻译：

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开发含 DES 的还原氧化石墨烯系统，具有高效的 CO2 吸附和光热脱附功能，用于 AEMFC 中的气体前净化


阴离子交换膜燃料电池 （AEMFC） 的碱性环境允许使用低成本催化剂和双极板，并引起了广泛关注。然而，进气中的 CO2 会对电池性能产生负面影响，导致电导率和输出功率降低。在这项研究中，我们开发了一种入口气体预处理装置，利用深共熔溶剂 （DES） 进行化学 CO2 吸附。还原氧化石墨烯 （rGO） 的引入实现了额外的物理吸附，将吸附容量从 0.286 g/g 增加到 0.399 g/g，同时以 94.3% 的效率实现了光热解吸。在单电池应用中的测试表明，处理气体中的 CO2 浓度在 110 分钟内降至 30 ppm，输出电压从 0.727 V 增加到 0.820 V，电流从 29.4 mA 增加到 39.3 mA。在光照下 84 min 内 CO2 浓度恢复到 400 ppm，输出电压和电流恢复到吸附前水平。研究了 O2 含量对电池性能的影响，揭示了输出电流和电压的增加速率与 O2 分压之间的直接相关性。采用开发的 CO2 去除装置延长了外部负载的使用寿命。