TY - JOUR
T1 - Atomic iron on porous graphene films for catalyzing the VO2+/VO2+ redox couple in vanadium redox flow batteries
AU - Huang, Jing
AU - He, Guanchao
AU - Huang, Kang
AU - Yan, Minmin
AU - Zhao, Zhongkun
AU - Sun, Hongtao
AU - Ye, Gonglan
AU - Fei, Huilong
N1 - Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/6
Y1 - 2023/6
N2 - The electrocatalytic activity of the electrode materials towards the vanadium redox couples is a major factor in determining the performance of vanadium redox flow batteries (VRFBs). Herein, we report the employment of iron single atoms supported on a monolithic porous graphene film (Fe1-PGF) as electrodes for catalyzing the VO2+/VO2+ redox couple. The high intrinsic catalytic activity of the atomic Fe sites, the superior surface hydrophilicity, along with the enhanced mass transfer efficiency and exposure of active sites benefited from the porous structure, endow the Fe1-PGF electrode with improved electrochemical performance compared to metal-free PGF counterpart and commercial graphite felt electrode. Consequently, the single-cell battery assembled with Fe1-PGF exhibits a high voltage efficiency (77.96%) and energy efficiency (70.27%) at the current density of 60 mA cm−2 as well as lower overpotential and higher rate capability compared to the control samples. This study demonstrates that single atom catalysts (SACs) are promising candidates for catalyzing the vanadium redox couples in VRFBs and motivates the exploration of SACs in other types of redox flow batteries.
AB - The electrocatalytic activity of the electrode materials towards the vanadium redox couples is a major factor in determining the performance of vanadium redox flow batteries (VRFBs). Herein, we report the employment of iron single atoms supported on a monolithic porous graphene film (Fe1-PGF) as electrodes for catalyzing the VO2+/VO2+ redox couple. The high intrinsic catalytic activity of the atomic Fe sites, the superior surface hydrophilicity, along with the enhanced mass transfer efficiency and exposure of active sites benefited from the porous structure, endow the Fe1-PGF electrode with improved electrochemical performance compared to metal-free PGF counterpart and commercial graphite felt electrode. Consequently, the single-cell battery assembled with Fe1-PGF exhibits a high voltage efficiency (77.96%) and energy efficiency (70.27%) at the current density of 60 mA cm−2 as well as lower overpotential and higher rate capability compared to the control samples. This study demonstrates that single atom catalysts (SACs) are promising candidates for catalyzing the vanadium redox couples in VRFBs and motivates the exploration of SACs in other types of redox flow batteries.
KW - Graphene
KW - Self-standing film electrode
KW - Single atom catalysts
KW - Vanadium redox flow battery
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U2 - 10.1016/j.mtphys.2023.101117
DO - 10.1016/j.mtphys.2023.101117
M3 - Article
AN - SCOPUS:85159855086
SN - 2542-5293
VL - 35
JO - Materials Today Physics
JF - Materials Today Physics
M1 - 101117
ER -