4.8 Article

Redox-active poly(6-(1H-pyrrol-1-yl)quinoxaline) as a novel organic anode material for aqueous hybrid flow batteries

期刊

JOURNAL OF POWER SOURCES
卷 451, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jpowsour.2020.227788

关键词

Aqueous hybrid flow battery; Conjugated polymer; Redox-active; Capacity retention

资金

  1. National Natural Science Foundation of China [21573025, 21773018, 21975033]
  2. Natural Science Foundation of the Jiangsu Higher Education Institutions of China [17KJA150001]
  3. Foundation of Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology [BM2012110]
  4. China Scholarships council [201808320086]
  5. Qing Lan project of Jiangsu Province

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To develop efficient electrochemical energy storage systems for large-scale use of renewable energy, a novel quinoxaline-bearing redox-active conjugated polymer (poly(6-(1H-pyrrol-1-yl)quinoxaline), PPyQX) has been synthesized via a facile bromine oxidation polymerization approach and employed as electro-active anode material for aqueous hybrid flow batteries. The PPyQX displays a quasi-reversible redox reaction at -0.79 V vs the standard hydrogen electrode (SHE) with good stability in aqueous alkaline electrolytes. An aqueous hybrid flow battery is fabricated using the PPyQX as the anode material and K4Fe(CN)(6) as the catholyte, respectively, which displays an open circuit potential of 1.15 V at 50% state of charge (SOC) and a discharge capacity of 67.1 mAh g(-1) at the current density of 1 A g(-1). The maximum power density reaches 2.7 and 1.5 W g(-1) at 100% and 50% SOC, respectively. After 1000 charge-discharge cycles, ca. 74.8% of initial discharge capacity is retained, projecting an average capacity retention rate of similar to 99.975% per cycle. The coulombic efficiency is near to 93.8% and the round-trip energy efficiency is kept around 80.5%.

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