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Branched Sulfonated Polyimide/Sulfonated Methylcellulose Composite Membranes with Remarkable Proton Conductivity and Selectivity for Vanadium Redox Flow Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-01-29 , DOI: 10.1002/celc.201901887 Jun Long 1 , Hongyan Yang 1 , Yanlin Wang 1 , Wenjie Xu 1 , Jun Liu 1 , Huan Luo 1 , Jinchao Li 1 , Yaping Zhang 1 , Hongping Zhang 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-01-29 , DOI: 10.1002/celc.201901887 Jun Long 1 , Hongyan Yang 1 , Yanlin Wang 1 , Wenjie Xu 1 , Jun Liu 1 , Huan Luo 1 , Jinchao Li 1 , Yaping Zhang 1 , Hongping Zhang 1
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A series of branched sulfonated polyimide (bSPI)/sulfonated methylcellulose (s‐MC) composite membranes composed of a designed and synthesized bSPI polymer and functionalized s‐MC are prepared by using a facile solution casting method for vanadium redox flow batteries (VRFBs). Among all bSPI/s‐MC composite membranes, the optimized bSPI/s‐MC‐20 % composite membrane has the best proton selectivity of 2.45×105 S min cm−3, which is 14.4 times as high as the Nafion 115 membrane. The bSPI/s‐MC‐20 % composite membrane possesses superior proton conductivity compared to most reported SPI‐based composite membranes for VRFBs. The VRFB with a bSPI/s‐MC‐20 % composite membrane shows excellent battery efficiencies (CE=99.2–98.0 %, EE=66.3–77.6 %) and capacity retention (73.3–47.2 %). Moreover, the cost of the bSPI/s‐MC‐20 % composite membrane is only a quarter of that of a commercial Nafion 115 membrane. This work develops a new strategy to fabricate cheap bSPI‐based composite membranes by introducing a suitable functionalized biomass material.
中文翻译：
支链的磺化聚酰亚胺/磺化甲基纤维素复合膜，具有明显的质子电导率和对钒氧化还原液流电池的选择性
使用方便的溶液浇铸法为钒氧化还原液流电池（VRFB）制备了一系列分支的磺化聚酰亚胺（bSPI）/磺化甲基纤维素（s-MC）复合膜，这些膜由设计和合成的bSPI聚合物和功能化s-MC组成。在所有bSPI / s-MC复合膜中，优化的bSPI / s-MC-20％复合膜具有2.45×10 5 S min cm -3的最佳质子选择性，是Nafion 115膜的14.4倍。与大多数报道的VRFBs的基于SPI的复合膜相比，bSPI / s-MC-20％的复合膜具有优异的质子传导性。具有bSPI / s‐MC‐20％复合膜的VRFB具有出色的电池效率（CE = 99.2–98.0％，EE= 66.3–77.6％）和容量保留（73.3–47.2％）。而且，bSPI / s-MC-20％复合膜的成本仅为商用Nafion 115膜的四分之一。这项工作提出了一种通过引入合适的功能化生物质材料来制造廉价的基于bSPI的复合膜的新策略。
更新日期：2020-01-30
中文翻译：
支链的磺化聚酰亚胺/磺化甲基纤维素复合膜，具有明显的质子电导率和对钒氧化还原液流电池的选择性
使用方便的溶液浇铸法为钒氧化还原液流电池（VRFB）制备了一系列分支的磺化聚酰亚胺（bSPI）/磺化甲基纤维素（s-MC）复合膜，这些膜由设计和合成的bSPI聚合物和功能化s-MC组成。在所有bSPI / s-MC复合膜中，优化的bSPI / s-MC-20％复合膜具有2.45×10 5 S min cm -3的最佳质子选择性，是Nafion 115膜的14.4倍。与大多数报道的VRFBs的基于SPI的复合膜相比，bSPI / s-MC-20％的复合膜具有优异的质子传导性。具有bSPI / s‐MC‐20％复合膜的VRFB具有出色的电池效率（CE = 99.2–98.0％，EE= 66.3–77.6％）和容量保留（73.3–47.2％）。而且，bSPI / s-MC-20％复合膜的成本仅为商用Nafion 115膜的四分之一。这项工作提出了一种通过引入合适的功能化生物质材料来制造廉价的基于bSPI的复合膜的新策略。
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