▎ 摘　　要

As the core component of proton exchange membrane fuel cells, proton exchange membranes (PEM) have attracted much attention of researchers. To trade-off the proton conductivity, dimensional stability and anti-oxidation ability of PEM, graphene oxide (GO) and acidized multi-walled carbon nanotubes (MWCNT) using calcium ion as coordination bridge (GO-Ca2+-MWCNT) was synthesized, and then incorporated into sulfonated poly(arylene ether nitrile) (SPEN) to fabricate SPEN/GO-Ca2+-MWCNT organic-inorganic composite membranes by solution-casting method and explore the influence of varying loading on performances as PEM. It was found that the proton conductivity of the composite membranes was higher than that of SPEN, while maintaining better dimensional stability, excellent anti-oxidation ability and good mechanical properties. All of these were attributed to the formation of three-dimensional structure between GO and MWCNT bridged by Ca2+ and the interaction between the sulfonic acid group and calcium ions in SPEN/GO-Ca2+-MWCNT composites. Particularly, the SPEN/GO-Ca2+-MWCNT-1 composite membrane exhibited excellent tensile strength of 71.45 MPa, better thermal stability as well as high proton conductivity (0.054 S/cm at 30 degrees C, and 0.193 S/cm at 90 degrees C), above 10(-2) S/cm, satisfying the requirement of PEM. All in all, the results indicate that the filler with three-dimensional network structure can effectively improve the performances of SPEN, and the prepared composite membranes show potential applications in many fields.