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Enhancement in Proton Conductivity and Thermal Stability in Nafion Membranes Induced by Incorporation of Sulfonated Carbon Nanotubes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-04-05 00:00:00 , DOI: 10.1021/acsami.8b01513 Chongshan Yin 1 , Jingjing Li 1 , Yawei Zhou 1 , Haining Zhang 2 , Pengfei Fang 1 , Chunqing He 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-04-05 00:00:00 , DOI: 10.1021/acsami.8b01513 Chongshan Yin 1 , Jingjing Li 1 , Yawei Zhou 1 , Haining Zhang 2 , Pengfei Fang 1 , Chunqing He 1
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Proton exchange membrane fuel cell (PEMFC) is one of the most promising green power sources, in which perfluorinated sulfonic acid ionomer-based membranes (e.g., Nafion) are widely used. However, the widespread application of PEMFCs is greatly limited by the sharp degradation in electrochemical properties of the proton exchange membranes under high temperature and low humidity conditions. In this work, the high-performance sulfonated carbon nanotubes/Nafion composite membranes (Su-CNTs/Nafion) for the PEMFCs were prepared and the mechanism of the microstructures on the macroscopic properties of membranes was intensively studied. Microstructure evolution in Nafion membranes during water uptake was investigated by positron annihilation lifetime spectroscopy, and results strongly showed that the Su-CNTs or CNTs in Nafion composite membranes significantly reinforced Nafion matrices, which influenced the development of ionic-water clusters in them. Proton conductivities in Su-CNTs/Nafion composite membranes were remarkably enhanced due to the mass formation of proton-conducting pathways (water channels) along the Su-CNTs. In particular, these pathways along Su-CNTs in Su-CNTs/Nafion membranes interconnected the isolated ionic-water clusters at low humidity and resulted in less tortuosity of the water channel network for proton transportation at high humidity. At a high temperature of 135 °C, Su-CNTs/Nafion membranes maintained high proton conductivity because the reinforcement of Su-CNTs on Nafion matrices reduced the evaporation of water molecules from membranes as well as the hydrophilic Su-CNTs were helpful for binding water molecules.
中文翻译：
掺入磺化碳纳米管引起的Nafion膜质子电导率和热稳定性的增强
质子交换膜燃料电池（PEMFC）是最有前途的绿色动力源之一，其中全氟磺酸离聚物基膜（例如，Nafion）被广泛使用。然而，质子交换膜在高温和低湿度条件下的电化学性能急剧下降极大地限制了PEMFC的广泛应用。在这项工作中，制备了用于PEMFC的高性能磺化碳纳米管/ Nafion复合膜（Su-CNTs / Nafion），并深入研究了微观结构对膜的宏观性能的作用机理。通过正电子an没寿命光谱研究了吸水过程中Nafion膜的微观结构演变，结果表明，Nafion复合膜中的Su-CNTs或CNTs显着增强了Nafion基质，从而影响了其中离子水簇的形成。由于沿着Su-CNTs的质子传导通道（水通道）的大量形成，Su-CNTs / Nafion复合膜中的质子电导率显着提高。尤其是，这些沿着Su-CNTs / Nafion膜中Su-CNTs的路径将低湿度下分离的离子水团簇相互连接，并导致水通道网络在高湿度下质子运输的曲折性降低。在135°C的高温下，
更新日期：2018-04-05
中文翻译：
掺入磺化碳纳米管引起的Nafion膜质子电导率和热稳定性的增强
质子交换膜燃料电池（PEMFC）是最有前途的绿色动力源之一，其中全氟磺酸离聚物基膜（例如，Nafion）被广泛使用。然而，质子交换膜在高温和低湿度条件下的电化学性能急剧下降极大地限制了PEMFC的广泛应用。在这项工作中，制备了用于PEMFC的高性能磺化碳纳米管/ Nafion复合膜（Su-CNTs / Nafion），并深入研究了微观结构对膜的宏观性能的作用机理。通过正电子an没寿命光谱研究了吸水过程中Nafion膜的微观结构演变，结果表明，Nafion复合膜中的Su-CNTs或CNTs显着增强了Nafion基质，从而影响了其中离子水簇的形成。由于沿着Su-CNTs的质子传导通道（水通道）的大量形成，Su-CNTs / Nafion复合膜中的质子电导率显着提高。尤其是，这些沿着Su-CNTs / Nafion膜中Su-CNTs的路径将低湿度下分离的离子水团簇相互连接，并导致水通道网络在高湿度下质子运输的曲折性降低。在135°C的高温下，
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