双溴对苯二甲酸构筑的铕(Ⅲ)-MOF的质子导电性能OA

In this study,2,5-dibromoterephthalic acid(H2DBTA)was employed as the organic bridging ligand,and a europium(Ⅲ)-based metal-organic framework,[Eu2(DBTA)3(DMF)2]·DMF(denoted as MOF 1),was synthesized via a solvothermal method according to a reference approach.The structural features and stability of MOF 1 were systematically characterized using powder X-ray diffraction(PXRD),Fourier transform infrared spectroscopy(FT-IR),thermogravimetric analysis(TGA),and scanning electron microscopy(SEM).Pore parameters were evaluated through nitrogen adsorption-desorption measurements,while hydrophilicity was determined via water contact angle tests.Proton conductivity was investigated using alternating current(AC)impedance spectroscopy over a temperature range of 30～100℃ and relative humidity(RH)values of 68％～97％.The activation energy(Ea)was calculated using the Arrhenius equation to elucidate the proton transport mechanism.Results indicated that MOF 1 achieved a proton conductivity of 1.59×10-3 S/cm at 100℃ and 97％RH.Notably,proton transport within the MOF framework followed the Grotthuss mechanism under both high-humidity(97％RH)and low-humidity(68％RH)conditions.This work provides experimental and theoretical insights for the rational design of lanthanide-based MOFs as high-performance proton-conducting materials.