Koók László, Lajtai-Szabó Piroska, Bakonyi Péter, Bélafi-Bakó Katalin, Nemestóthy Nándor
Research Group on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary.
Membranes (Basel). 2021 May 14;11(5):359. doi: 10.3390/membranes11050359.
Hydrophobic ionic liquids (IL) may offer a special electrolyte in the form of supported ionic liquid membranes (SILM) for microbial fuel cells (MFC) due to their advantageous mass transfer characteristics. In this work, the proton and ion transfer properties of SILMs made with IL containing imidazolium cation and [PF] and [NTf] anions were studied and compared to Nafion. It resulted that both ILs show better proton mass transfer and diffusion coefficient than Nafion. The data implied the presence of water microclusters permeating through [hmim][PF]-SILM to assist the proton transfer. This mechanism could not be assumed in the case of [NTf] containing IL. Ion transport numbers of K, Na, and H showed that the IL with [PF] anion could be beneficial in terms of reducing ion transfer losses in MFCs. Moreover, the conductivity of [bmim][PF]-SILM at low electrolyte concentration (such as in MFCs) was comparable to Nafion.
疏水性离子液体（IL）由于其有利的传质特性，可能为微生物燃料电池（MFC）提供一种以支撑离子液体膜（SILM）形式存在的特殊电解质。在这项工作中，研究了由含咪唑阳离子以及[PF]和[NTf]阴离子的离子液体制成的支撑离子液体膜的质子和离子转移特性，并与Nafion进行了比较。结果表明，两种离子液体均显示出比Nafion更好的质子传质和扩散系数。数据表明存在水微团簇透过[hmim][PF]-支撑离子液体膜来协助质子转移。在含[NTf]的离子液体的情况下，无法假定存在这种机制。K、Na和H的离子迁移数表明，含[PF]阴离子的离子液体在减少微生物燃料电池中的离子转移损失方面可能是有益的。此外，[bmim][PF]-支撑离子液体膜在低电解质浓度下（如在微生物燃料电池中）的电导率与Nafion相当。
