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Interaction Regulation Between Ionomer Binder and Catalyst: Active Triple-Phase Boundary and High Performance Catalyst Layer for Anion Exchange Membrane Fuel Cells
Advanced Science ( IF 14.3 ) Pub Date : 2021-08-02 , DOI: 10.1002/advs.202101744 Huixing Cao 1 , Ji Pan 1 , Hairong Zhu 1 , Zhe Sun 1 , Bowen Wang 1 , Junliang Zhao 1 , Feng Yan 1
Advanced Science ( IF 14.3 ) Pub Date : 2021-08-02 , DOI: 10.1002/advs.202101744 Huixing Cao 1 , Ji Pan 1 , Hairong Zhu 1 , Zhe Sun 1 , Bowen Wang 1 , Junliang Zhao 1 , Feng Yan 1
Affiliation
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As one of the most crucial components, the catalyst layer (CL) plays a critical role in the performance of anion exchange membrane fuel cells (AEMFCs). However, the effect of the structural evolution of ionomer binder on the micromorphology and catalytic activity of CL is yet to be clarified. In this study, pyrrolidinum and quaternary ammonium cations are attached to the polyphenylene oxide (PPO) backbone through flexible spacer units (five, seven, or nine carbon atoms) with different terminal alkyl groups. The Van der Waals force and electrostatic repulsion between the ionomer binder and catalyst are regulated through the flexible spacer units and terminal alkyl groups to alleviate the agglomeration of catalyst particles and acquire a high catalytic activity. To evaluate the electrochemical stability of the cationic groups, the alkaline stability of the ionomer binder is tested under a constant voltage to simulate the true operational environment of the fuel cells. The results reveal that the degradation of the cation groups of ionomer binder is accelerated under a constant voltage condition. This phenomenon in neglect earlier, may serve as a useful reference for the synthesis and performance enhancement of ionomer binders.
中文翻译：
离聚物粘合剂和催化剂之间的相互作用调节：阴离子交换膜燃料电池的活性三相边界和高性能催化剂层
作为最关键的组件之一，催化剂层（CL）对阴离子交换膜燃料电池（AEMFC）的性能起着至关重要的作用。然而，离聚物粘合剂的结构演变对CL微形貌和催化活性的影响尚不清楚。在这项研究中，吡咯烷和季铵阳离子通过具有不同末端烷基的柔性间隔单元（五个、七个或九个碳原子）连接到聚苯醚（PPO）主链上。通过柔性间隔单元和末端烷基调节离聚物粘合剂和催化剂之间的范德华力和静电斥力，以减轻催化剂颗粒的团聚并获得高催化活性。为了评估阳离子基团的电化学稳定性，在恒定电压下测试离聚物粘合剂的碱性稳定性，以模拟燃料电池的真实操作环境。结果表明，在恒压条件下，离聚物粘合剂的阳离子基团的降解加速。这种早期被忽视的现象可以为离聚物粘合剂的合成和性能增强提供有用的参考。
更新日期：2021-10-08
中文翻译：
离聚物粘合剂和催化剂之间的相互作用调节：阴离子交换膜燃料电池的活性三相边界和高性能催化剂层
作为最关键的组件之一，催化剂层（CL）对阴离子交换膜燃料电池（AEMFC）的性能起着至关重要的作用。然而，离聚物粘合剂的结构演变对CL微形貌和催化活性的影响尚不清楚。在这项研究中，吡咯烷和季铵阳离子通过具有不同末端烷基的柔性间隔单元（五个、七个或九个碳原子）连接到聚苯醚（PPO）主链上。通过柔性间隔单元和末端烷基调节离聚物粘合剂和催化剂之间的范德华力和静电斥力，以减轻催化剂颗粒的团聚并获得高催化活性。为了评估阳离子基团的电化学稳定性，在恒定电压下测试离聚物粘合剂的碱性稳定性，以模拟燃料电池的真实操作环境。结果表明，在恒压条件下，离聚物粘合剂的阳离子基团的降解加速。这种早期被忽视的现象可以为离聚物粘合剂的合成和性能增强提供有用的参考。
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