摘要
Polyethyleneimine (PEI) is expected to become a new type of proton conduction booster due to its high density amine and extremely high flexibility.Herein,a nanofiber membrane (eHPW-PEI) composed of PEI and phosphotungstic acid (H_(3)PW_(12)O_(40),HPW) was prepared by electrostatic spinning using polyvinylpyrrolidone (PVP) as an adhesive.In eHPW-PEI,the continuous H-bond network formed by HPW-PEI acid–base pairs,the segmental movement of highly flexible PEI and the well-tuned pathway of 1D nanofibers jointly prompt the fast transfer of protons under high temperature and low humidity conditions.The proton conductivity of eHPW-PEI with 25 wt% HPW (eHPW-PEI1) reached 1.6×10^(-3) S cm^(-1) at 85℃ and 60% relative humidity (RH) and 3.7×10^(-3) S cm^(-1) at 135℃.This is the first time that the segmental movement of a highly flexible polymer is utilized to accelerate proton transfer,which may be considered as a ‘proton escalator’.
基金
supported by the National Natural Science Foundation of China(grant no.21671033,22071019 and 21872021)
the National Key Research and Development Program of China(grant no.2016YFB0901600)
the Zhejiang Provincial Natural Science Foundation of China(LY18B010001).
