磺化聚醚醚酮掺杂叔铵盐类离子液体复合膜的制备及离子液体与Pt/C催化剂的相容性

摘要

采用中和法制备了两种叔铵盐类离子液体[(CH3 CH2)3 NH+][HSO-4](简称TEAS)及[(CH3 CH2)3 NH+][H2 PO-4](简称TEAP),傅里叶红外光谱图表明制备的离子液体为TEAS及TEAP。并将制备的叔铵盐类离子液体掺杂到不同磺化度的磺化聚醚醚酮(简称SPEEK)中,通过溶液浇铸法制备了SPEEK/IL复合膜,对复合膜进行了差示扫描量热(DSC)表征,测试了复合膜中离子液体的流失率及其与Pt/C催化剂的循环伏安(CV)及氧还原(ORR)曲线。SPEEK掺杂叔铵盐类离子液体后,由于叔铵盐离子液体以化学力与SPEEK网状结构中的磺酸基结合,导致复合膜的热稳定性下降,但同时也降低了复合膜中的离子液体流失率。CV及ORR曲线表明,Pt/C催化剂与叔铵盐离子液体电化学窗口相差较小,氧还原活性降低少,两者相容性较好。此类复合膜在质子交换膜燃料电池中具有应用前景。%The SPEEK/IL composite proton exchange membranes were prepared by solution casting methodbased on sulfonated polyetheretherketone (SPEEK ) and the triethylammonium dihydrogen phosphate ([(CH3 CH2 )3 NH+] [H2 PO-4 ],TEAP)or triethylammonium dihydrogen sulfate ([(CH3 CH2 )3 NH+] [HSO-4 ],TEAS)ionic liquid which was synthesized by neutralization method.The Fourier Transform Infrared (FTIR) spectra reveals that the material prepared was TEAS and TEAP.The Differential Scanning Calorimetry (DSC),the ionic liquid loss rate of SPEEK/IL composite membranes,CV and ORR curves between IL and Pt/C catalysts were characterized respectively.Since the incorporated ionic liquid was anchored within the sulfonic acid group of SPEEK net-like matrix by chemical action, the thermal stability of composite membrane decreased,but the ionic liquid loss rate in membrane decreased after SPEEK incorporated with ionic liquid.CV and ORR curves showed that the differences of electrochemical window between the tertiary ionic liquid and Pt/C catalyst were small,oxygen reduction activities dropped little, thus the compatibility was good.This polymer/IL composite membrane has good prospect in the application of the proton exchange membrane fuel cell.