磁电复合场下正极钒离子的跨膜传质

Mass transfer of positive vanadium ions across cell membrane under magnetoelectric composite field

探究了全钒液流电池在外加磁场、电场、磁电复合场下正极电解液中的钒离子在Nafion117膜上的跨膜传质过程,以及在磁电复合场下硫酸浓度和电解液添加剂对传质过程的影响。根据达西定律拟合得出相应的扩散传质系数。实验结果表明正向电场会加剧钒离子渗透,且当电场强度达到30V·m^(-1)时渗透情况严重可达到无电场时的2.53倍。非匀强磁场的加入可明显降低钒离子的跨膜渗透性。且当外加磁场和电场复合场时,磁场对降低钒离子跨膜渗透的作用更加显著。实验还得出在不同的外加复合场中较高浓度硫酸有利于降低钒离子的跨膜渗透。此外丙三醇、木质素磺酸钠正极电解液添加剂的加入也降低了VO_2^+的跨膜渗透性。

The mass transfer of positive vanadium ions across Nafion117 membrane within the magnetic field,electric field,and other additives complex field were studied.Diffusion coefficients were estimated based on experimental data based on the Darcy's Law.The results show that the forward electric field will increase the permeability of vanadium ions.The permeability within an electric field density was estimated to be 30 V· m^(-1) which is 2.53 times as large as that without applied electric field.A non-uniform magnetic field can significantly help reduce the permeability of vanadium ions.When the non-uniform magnetic and electric fields are applied simultaneously,the effects of non-uniform magnetic field on the mass transfer are more noteble.A higher concentration of sulfuric acid solution contributes more to reduce the permeability of VO_2^+.Permeability of VO_2^+ are also decreased by mixing in glycerol,ligninsulfonate and other cathode electrolyte additives.