本课题针对直接甲醇燃料电池质子交换膜（PEM）质子电导率偏低及燃料渗透严重的问题，设计新型高分子PEM，构筑三维纳米多级质子传输通道，并对其结构与性能之间的关系进行深入研究。设计尺寸可控功能化大分子质子导体，通过自组装手段在制备高稳定性三维PEM的过程中实现纳米多级质子传输通道的原位可控构筑。基于有针对性的分子设计及合成，结合基础电化学技术、形貌表征、流体动力学模拟、稳定性测试和器件性能测试等手段，研究PEM的质子传输效率、抗燃料渗透能力及机械性能，总结并提出纳米多级质子传输通道的微观结构与三维自组装PEM性能之间的构效关系。实现从分子角度精确设计高性能PEM的目的，解决PEM中存在的质子传输效率与阻醇能力之间的矛盾，实现质子电导率与抗燃料渗透能力的同步提高，提升直接甲醇燃料电池的实际输出能量密度。本课题将对直接甲醇燃料电池技术的产业化进程具有促进作用。

Commercialization of direct methanol fuel cell (DMFC) is hindered by the relatively low proton conductivity and serious methanol permeation issue of the currently used proton exchange membranes (PEMs). Aiming to solve these issues, this project will design and synthesize novel alternative self-assembled PEMs based on the concept of novel three-dimensional (3D) nano-scale hierarchical proton conductive channel (nano-HPCC) and will study the essential relationships between nano-HPCC structure and performance of the related PEMs. The nano-HPCC will be in-situ controllably constructed during the fabrication of three-dimensional PEM via self-assembly of the size-controllable functionalized proton conductive macromolecules. Proton conductivity, methanol-permeation resistivity and mechanical property of the PEMs will be characterized and systematical structure-performance relationships will be summarized by combining the experimental synthesis with computational fluid dynamic modeling, electrochemical technology, morphology characterization, stability measurements and fuel cell testing. Effective guidelines will be concluded for the molecule design of novel high performance PEM to resolve the contradiction between proton conductive efficiency and methanol permeation resistivity, methanol resistive PEM with high proton conductivity will be designed and fabricated. Effective energy density of DMFC will therefore be significantly improved and commercialization process of the DMFC technology will be strongly promoted.