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KMID : 0385520150280050341
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Analytical Science & Technology
2015 Volume.28 No. 5 p.341 ~ p.346
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Counter anion effects in anion exchange membrane-fabricated non-aqueous vanadium redox flow battery
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Son Pyeong-Soo
Oh Min-Seok
Ye Jun-Hee
Choi Seong-Ho
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Abstract
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In order to understand the counter anionic effects in a non-aqueous vanadium redox flow battery (VRFB), we synthesized four types of electrolyte salts (1-ethyltriethamine tertafluoroborate, [E-TEDA]+[BF4]?, 1-ethyltriethamine hexafluorophosphate, [E-TEDA]+[PF6]?, 1-butyltriethylamine tertafluoroborate, [B-TEDA]+[BF4]?,and 1-buthyltriethamine hexafluorophosphate [B-TEDA]+[PF6]?) by counter anion exchange reaction after the SN2 reaction. We confirmed the successful synthesis of the electrolyte salts [E-TEDA]+[Br]? and [B-TEDA]+[Br]?via 1H-NMR spectroscopy and GC-mass analysis before the counter anion exchange reaction. The electric potential of the vanadium acetylacetonate, V(acac)3, as an energy storage chemical was shown to be 2.2 V in the acetonitrile solvent with each of the [E-TEDA]+[BF4]?, [E-TEDA]+[PF6]?, [B-TEDA]+[BF4]?, and [B-TEDA]+[PF6]? electrolyte salts. In a non-aqueous VRFB with a commercial Neosepta AFN membrane, the maximum voltages reached 1.0 V and 1.5 V under a fixed current value of 0.1 mA in acetonitrile with the [E-TEDA]+[BF4]?and [E-TEDA]+ [PF6]? electrolyte salts, respectively. The maximum voltage was 0.8 V and 1.1 V under a fixed current value of 0.1 mA in acetonitrile with the [B-TEDA]+ [BF4]? and [B-TEDA]+ [PF6]? electrolyte salts, respectively. From these results, we concluded that in the non-aqueous VRFB more of the [PF6] ? counter anion than the [BF4]? counter anion was transported onto the commercial Neosepta AFN anion exchange membrane.
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KEYWORD
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Non-aqueous vanadium redox flow battery, Electrolyte salts, Triethyldiamine, Vanadium acetylacetonate, energy storage chemicals,
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