Highly efficient vanadium redox flow batteries enabled by a trilayer polybenzimidazole membrane assembly
作者机构：Korea Inst Sci & Technol KIST Hydrogen Fuel Cell Res Ctr Seoul South Korea Univ Sci & Technol KIST Sch Div Energy & Environm Technol Seoul South Korea Korea Univ Grad Sch Energy & Environm Seoul South Korea Korea Inst Sci & Technol KIST Hydrogen Fuel Cell Res Ctr Seoul 02792 South Korea Seoul Natl Univ Sci & Technol Dept Chem & Biomol Engn Seoul South Korea Seoul Natl Univ Sci & Technol Dept Chem & Biomol Engn 232 Gongneung ro Seoul 01811 South Korea Aarhus Univ Dept Biol & Chem Engn Aarhus Denmark
出 版 物：《CARBON ENERGY》 (碳能源（英文）)
年 卷 期：2024年第6卷第7期
页 面：191-204页
核心收录：
学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学]
基 金：Korea Institute for Advancement of Technology [2E31871, 2E32591] KIST [9090-00059] Innovation Fund Denmark Denmark [P0018437] Korea Institute for Advancement of Technology (KIAT) through the International Cooperative RD program [2021R1A6A1A03039981] Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education
主 题：polybenzimidazole porous membrane proton conductivity trilayer VRFBs PROTON-EXCHANGE MEMBRANES CONDUCTIVITY PERFORMANCE DEGRADATION STABILITY MECHANISM SOLVENT STORAGE ENERGY
摘 要：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.
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