He Shaojian, Lu Zhongrui, Dai Wenxu, Yang Kangning, Xue Yang, Jia Xiaoyang, Lin Jun
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China.
State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
Membranes (Basel). 2021 Jul 15;11(7):536. doi: 10.3390/membranes11070536.
Phosphotungstic acid (HPW)-filled composite proton exchange membranes possess high proton conductivity under low relative humidity (RH). However, the leaching of HPW limits their wide application. Herein, we propose a novel approach for anchoring water soluble phosphotungstic acid (HPW) by polydopamine (PDA) coated graphene oxide and halloysite nanotubes (DGO and DHNTs) in order to construct hybrid three-dimensional proton transport networks in a sulfonated poly(ether ether ketone) (SPEEK) membrane. The introduction of PDA on the surfaces of the hybrid fillers could provide hydroxyl groups and secondary amine groups to anchor HPW, resulting in the uniform dispersion of HPW in the SPEEK matrix. The SPEEK/DGO/DHNTs/HPW (90/5/5/60) composite membrane exhibited higher water uptake and much better conductivity than the SPEEK membrane at low relative humidity. The best conductivity reached wass 0.062 S cm for the composite membrane, which is quite stable during the water immersion test.
填充磷钨酸（HPW）的复合质子交换膜在低相对湿度（RH）下具有高质子传导率。然而，HPW的浸出限制了它们的广泛应用。在此，我们提出一种通过聚多巴胺（PDA）包覆的氧化石墨烯和埃洛石纳米管（DGO和DHNTs）来锚定水溶性磷钨酸（HPW）的新方法，以便在磺化聚醚醚酮（SPEEK）膜中构建混合三维质子传输网络。在混合填料表面引入PDA可以提供羟基和仲胺基团来锚定HPW，从而使HPW在SPEEK基体中均匀分散。SPEEK/DGO/DHNTs/HPW（90/5/5/60）复合膜在低相对湿度下表现出比SPEEK膜更高的吸水率和更好的传导率。复合膜达到的最佳传导率为0.062 S/cm，在水浸测试中相当稳定。
