Bui, Trung Tuyen Shin, Mingyu Rahimi, Mohammad Bentien, Anders Kwon, Yongchai Henkensmeier, Dirk 2024-02-22T02:00:11Z 2024-02-22T02:00:11Z 2024-02-22 2024-07 https://pubs.kist.re.kr/handle/201004/149289 A novel polybenzimidazole (PBI)-based trilayer membrane assembly is developed for application in vanadium redox flow battery (VRFB). The membrane comprises a 1 mu m thin cross-linked poly[2,2'-(p-oxydiphenylene)-5,5'-bibenzimidazole] (OPBI) sandwiched between two 20 mu m thick porous OPBI membranes (p-OPBI) without further lamination steps. The trilayer membrane demonstrates exceptional properties, such as high conductivity and low area-specific resistance (ASR) of 51 mS cm(-1) and 81 m Omega cm(2), respectively. Contact with vanadium electrolyte increases the ASR of trilayer membrane only to 158 m Omega cm(2), while that of Nafion is 193 m Omega cm(2). VO2+ permeability is 2.73 x 10(-9) cm(2) min(-1), about 150 times lower than that of Nafion NR212. In addition, the membrane has high mechanical strength and high chemical stability against VO2+. In VRFB, the combination of low resistance and low vanadium permeability results in excellent performance, revealing high Coulombic efficiency (>99%), high energy efficiency (EE; 90.8% at current density of 80 mA cm(-2)), and long-term durability. The EE is one of the best reported to date. English Wiley Highly efficient vanadium redox flow batteries enabled by a trilayer polybenzimidazole membrane assembly Article 10.1002/cey2.473 1 Carbon Energy, v.6, no.7 Carbon Energy 6 7 Y scie scopus 001158817900001 2-s2.0-85184677380 Chemistry, Physical Energy & Fuels Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Energy & Fuels Science & Technology - Other Topics Materials Science Article STORAGE ENERGY PROTON-EXCHANGE MEMBRANES CONDUCTIVITY PERFORMANCE DEGRADATION STABILITY MECHANISM SOLVENT polybenzimidazole porous membrane proton conductivity trilayer VRFBs