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Ion Exchange01:17

Ion Exchange

592
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
592

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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通过硫化聚离子液修改电催化剂-离子体接口) 块共聚合物,使高性能聚合物电解质燃料电池成为可能.

Yawei Li1, Tim Van Cleve1, Rui Sun2

  • 1Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States.

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|March 4, 2024
PubMed
概括
此摘要是机器生成的。

硫化多离子液体) 块共聚合物 (SPILBCP) 离子体改善了聚合物电解质膜燃料电池 (PEMFC) 动力学,但缺乏连接性. 将SPILBCP与Nafion混合,可以提高动力和大众运输区域的性能.

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 聚合物电解质膜燃料电池 (PEMFC) 对清洁能源至关重要.
  • 硫化多离子液体) 块共聚合物 (SPILBCP) 离子体通过抑制 (Pt) 表面氧化,提供增强的动力性能.
  • 然而,SPILBCP离子体具有较差的离子体网络连接性,导致在相对湿度 (RH) 较低时电化学活性区域的显著损失.

研究的目的:

  • 为了解决PEMFC电极中SPILBCP离子体的局限性.
  • 通过增强离子体网络连接来提高膜电极组件 (MEAs) 的整体性能.
  • 研究Nafion和SPILBCP离子体对MEA性能的联合影响.

主要方法:

  • 使用带有 SPILBCP 离子体的 Pt/Vulcan 电触媒制造 PEMFC 电极.
  • 电极性能的表征,专注于动力和质量传输区域.
  • 在MEAs中开发和测试混合Nafion/SPILBCP离子体系统.

主要成果:

  • 仅使用SPILBCP的电极显示,由于抑制了Pt氧化,其动力性能提高了两倍.
  • 由于离子体连接性差,SPILBCP电极在30%RH下经历了超过70%的电化学活性区域损失.
  • 混合Nafion/SPILBCP电极在跨越动力和质量运输限制的情况下,在MEA性能方面表现出了显著的改善.
  • 来自MEA测试的特定活性值与以前的半细胞结果相匹配,用于无纳系统.

结论:

  • 将Nafion与SPILBCP离子体混合,可以有效地克服单独使用SPILBCP的连接问题.
  • 结合的离子体系统显著提高了PEMFC中MEA的整体性能.
  • 这一战略提供了一个有前途的方法,通过定制电催化剂/离子体接口来改进表面可访问电催化剂的MEA.