Preparation and properties of sulfonated poly (aryl ether sulfone)s proton exchange membranes based on amino graft for vanadium flow battery

Preparation and Properties of Quaternary Ammonium Anion Exchange Membranes with Flexible Side Chains for the Vanadium Redox Flow Battery

“…(5-Bromopentyl)trimethylammonium bromide (BrC5TMA, ≥98%) was purchased from Tokyo Chemical Industry Co. Ltd. 4,4′-Difluorodiphenyl sulfone (DFDPS, 98.0%) was purchased from An Naiji Chemical Co. Ltd. Anhydrous potassium carbonate (K 2 CO 3 , >99.0%), sodium hydroxide (NaOH, AR), sulfuric acid (H 2 SO 4 ), 1,1′,2,2′tetrachloroethane (TCE, ≥99.0%), and dimethyl sulfoxide (DMSO, ≥99.0%) were purchased from Shanghai Lingfeng Chemical Reagent Co. Ltd. 4,4′-Dihydroxybiphenyl (BP, >98.0%), N-methylpyrrolidone (NMP, ≥99.5%), N,N′-diisopropylethylamine (DIPEA, ≥95.0%), benzoyl peroxide (BPO, ≥90.0%), and N-bromosuccinimide (NBS, ≥98%) were purchased from Aladdin Reagent (Shanghai) Co. Ltd. 3,3′-Di(3′′-aminophenyl)-4,4′-difluorophenone (2NH 2 -DFDPS) was synthesized according to our reported synthetic method previously. 34 Synthesis of Poly(Aryl Ether Sulfone)s Containing Diaminobenzene (2NH 2 −PAES-xx). For the synthesis of 2NH 2 −PAES-xx copolymers, using the preparation process of 2NH 2 −PAES-33 (xx = 2NH 2 -DFDPS/BP × 100, molar ratio) as an example, 1.4404 g (3.3 mmol) of 2NH 2 -DFDPS, 1.8621 g (10.0 mmol) of BP, 1.7035 g (6.7 mmol) of DFDPS, 1.38 g (10.0 mmol) of K 2 CO 3 , 12 mL of N-methylpyrrolidone, and 6 mL of toluene were added into a three-necked flask.…”

“…(5-Bromopentyl)­trimethylammonium bromide (BrC5TMA, ≥98%) was purchased from Tokyo Chemical Industry Co. Ltd. 4,4′-Difluorodiphenyl sulfone (DFDPS, 98.0%) was purchased from An Naiji Chemical Co. Ltd. Anhydrous potassium carbonate (K 2 CO 3 , >99.0%), sodium hydroxide (NaOH, AR), sulfuric acid (H 2 SO 4 ), 1,1′,2,2′-tetrachloroethane (TCE, ≥99.0%), and dimethyl sulfoxide (DMSO, ≥99.0%) were purchased from Shanghai Lingfeng Chemical Reagent Co. Ltd. 4,4′-Dihydroxybiphenyl (BP, >98.0%), N -methylpyrrolidone (NMP, ≥99.5%), N,N ′-diisopropylethylamine (DIPEA, ≥95.0%), benzoyl peroxide (BPO, ≥90.0%), and N -bromosuccinimide (NBS, ≥98%) were purchased from Aladdin Reagent (Shanghai) Co. Ltd. 3,3′-Di­(3′′-aminophenyl)-4,4′-difluorophenone (2NH 2 -DFDPS) was synthesized according to our reported synthetic method previously …”

High Proton Conductivity Membrane Based on Sulfonated Polybenzimidazole by Doping Ethylenediaminetetraacetic Acid-Modified MOF-808 for Vanadium Flow Battery

“…6,7 Hence, it is imperative and indispensable to produce some high-performance PEMs applied for VRFBs. 8,9 To promote membrane performance, there are several commonly used methods to prepare PEMs including crosslinking, polymer blending, and hybrid. However, it is quite difficult to control the nanochannel structure precisely.…”

“…Thus, high-performance energy storage devices are urgently desired for studying and developing . Among them, vanadium redox flow batteries (VRFBs) are effective means of power source storage. , The proton exchange membrane (PEM) is crucial for performances of VRFBs, which can prevent the mixing of anolyte and catholyte and provide proton transport channels. , At present, the widely used PEM is the Nafion membrane; however, it is restricted largely because of its high vanadium ions’ permeability and expensive cost. , Hence, it is imperative and indispensable to produce some high-performance PEMs applied for VRFBs. , …”