Ahn Su Min, Jeong Hwan Yeop, Jang Jung-Kyu, Lee Jang Yong, So Soonyong, Kim Young Jun, Hong Young Taik, Kim Tae-Ho
Membrane Research Center, Korea Research Institute of Chemical Technology (KRICT) 141 Gajeong-ro, Yuseong-gu Daejeon 34114 Republic of Korea
School of Chemical Engineering, Sungkyunkwan University Suwon Kyunggi 440-746 Republic of Korea.
RSC Adv. 2018 Jul 16;8(45):25304-25312. doi: 10.1039/c8ra03921f.
In order to increase the chemical stability of polybenzimidazole (PBI) membrane against the highly oxidizing environment of a vanadium redox flow battery (VRFB), PBI/Nafion hybrid membrane was developed by spray coating a Nafion ionomer onto one surface of the PBI membrane. The acid-base interaction between the sulfonic acid of the Nafion and the benzimidazole of the PBI created a stable interfacial adhesion between the Nafion layer and the PBI layer. The hybrid membrane showed an area resistance of 0.269 Ω cm and a very low vanadium permeability of 1.95 × 10 cm min. The Nafion layer protected the PBI from chemical degradation under accelerated oxidizing conditions of 1 M VO /5 M HSO, and this was subsequently examined in spectroscopic analysis. In the VRFB single cell performance test, the cell with the hybrid membrane showed better energy efficiency than the Nafion cell with 92.66% at 40 mA cm and 78.1% at 100 mA cm with no delamination observed between the Nafion layer and the PBI layer after the test was completed.
为了提高聚苯并咪唑（PBI）膜在钒氧化还原液流电池（VRFB）高氧化性环境中的化学稳定性，通过在PBI膜的一个表面喷涂Nafion离聚物来制备PBI/Nafion复合膜。Nafion的磺酸与PBI的苯并咪唑之间的酸碱相互作用在Nafion层和PBI层之间形成了稳定的界面粘附。该复合膜的面积电阻为0.269 Ω·cm，钒渗透率非常低，为1.95×10 cm/min。在1 M VO/5 M HSO的加速氧化条件下，Nafion层保护PBI免受化学降解，随后在光谱分析中对此进行了研究。在VRFB单电池性能测试中，使用复合膜的电池显示出比Nafion电池更好的能量效率，在40 mA/cm时为92.66%，在100 mA/cm时为78.1%，测试完成后，Nafion层和PBI层之间未观察到分层现象。
