Journal
NANO ENERGY
Volume 47, Issue -, Pages 361-367Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2018.03.013
Keywords
Flow battery; Bifunctional catalyst; Oxygen evolution; Oxygen reduction
Categories
Funding
- National Key Research and Development Program of China [2017YFA0206500]
- NSF of China [51502012, 21606015, 21676020, 21620102007]
- Beijing Natural Science Foundation [17L20060, 2162032]
- Start-up fund for talent introduction of Beijing University of Chemical Technology [buctrc201420, buctrc201714]
- Talent cultivation of State Key Laboratory of Organic-Inorganic Composites
- Fundamental Research Funds for the Central Universities [buctrc201420, buctrc201524, buctrc201704, ZD1502]
- BUCT Fund for Disciplines Construction and Development [XK1502]
- 111 project of China [B14004]
- Distinguished scientist program at BUCT [buctylkxj02]
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Air-based flow batteries have triggered huge interests as promising large-scale energy storage devices due to their high energy density and extremely low cost. However, the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) lower their energy conversion efficiencies. Herein, we in situ grow amorphous NiSx-FeOy particles on sulfur doped carbon fiber paper (termed as NiSx-FeOy/SCFP) as practical self-supported oxygen electrode through a simple and economic synthesis route. Benefiting from the synergetic effects of amorphous NiSx-FeOy and SCFP, NiSx-FeOy/SCFP possesses massively accessible active sites, enhanced electrons and reactants transfer, and stable integrated structure, exhibiting a low overpotential (0.37 V) at 10 mA cm(-2) for OER, a positive half-wave potential for ORR and a small potential gap (0.82 V). Zinc air flow battery assembled with newly developed NiSx-FeOy/SCFP shows a coulombic efficiency of 100% and a voltage efficiency of 50% at the charge-discharge current of 10 mA cm(-2), and vigorously operates 110 h without performance decay, showing highly catalytic activity and super cycling stability, which are among the best performance ever reported. We believe that this work will open up new ways for fabricating practical oxygen electrode for metal air based batteries applications.
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