磷钨酸固载纳米纤维-全氟磺酸复合膜具有低钒渗透率和高钒氧化还原流电池选择性。
Phosphotungstic acid immobilized nanofibers-Nafion composite membrane with low vanadium permeability and high selectivity for vanadium redox flow battery.
机构信息
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No. 92 West-Da Zhi Street, Harbin 150001, China.
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No. 92 West-Da Zhi Street, Harbin 150001, China.
出版信息
J Colloid Interface Sci. 2019 Apr 15;542:177-186. doi: 10.1016/j.jcis.2019.02.001. Epub 2019 Feb 1.
A novel composite vanadium-blocking proton exchange membrane for vanadium redox flow battery (VRB) was designed and constructed by immobilizing phosphotungstic acid (PWA) on Nano Kevlar Fibers (NKFs) via a solution-casting method. The proton/vanadium selectivity of the composite membrane is greatly improved by incorporating the complex formed by NKFs and PWA into the Nafion matrix. Simple tuning of the complex doping quantity results in different composite membranes with superior vanadium barrier properties (namely, a minimum vanadium permeability of 2.46 × 10 cm min). This coupled with proton conductivities reaching 0.061 S cm at room temperature indicates a proton/vanadium selectivity of 2.48 × 10 S min cm, which is 6.3 times higher than that of recast Nafion (0.34 × 10 S min cm). When tested in a VRB, the performance of the single cell assembled with the composite membrane greatly outperforms that with recast Nafion at current densities ranging from 40 to 100 mA cm.
一种新型的复合钒阻断质子交换膜被设计并构建用于钒氧化还原流电池（VRB），通过将磷钨酸（PWA）固定在纳米芳纶纤维（NKFs）上，并通过溶液浇铸法将其结合到 Nafion 基质中。通过将 NKFs 和 PWA 形成的复合物掺入 Nafion 基质中，大大提高了复合膜的质子/钒选择透过性。通过简单地调整复合物的掺杂量，可以得到具有优异的钒阻隔性能的不同复合膜（即，最小的钒透过率为 2.46×10 cm min）。这与室温下达到的 0.061 S cm 的质子电导率相结合，表明质子/钒的选择透过性为 2.48×10 S min cm，是重铸 Nafion（0.34×10 S min cm）的 6.3 倍。在 VRB 中进行测试时，与用重铸 Nafion 组装的单电池相比，在 40 至 100 mA cm 的电流密度范围内，用复合膜组装的单电池的性能大大提高。
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