Herein for the first
time, we have reported the performance and
characteristics of new high-voltage zinc–vanadium (Zn–V)
metal hybrid redox flow battery using a zinc bromide (ZnBr2)-based electrolyte. The Zn–V system showed an open-circuit
voltage of 1.85 V, which is very close to that of zinc–bromine
flow cell. The obtained results exhibited a voltaic, Coulombic, and
energy efficiencies of 88, 82, and 72% at 20 mA.cm–2, respectively, in which low-cost microporous membrane was used as
a separator. However, the cell tested using Nafion-117 membrane showed
voltaic, Coulombic, and energy efficiencies of 84, 83, and 71%, respectively
at a current density of 20 mA.cm–2. Furthermore,
the Zn–V cell performance is also compared with the Zn–Br2 flow system to highlight the advancement of the new Zn–V
system. The cell also showed stable performance up to 50 cycles at
a current density of 20 mA.cm-2.
In this work, the effect of electrolyte composition and the pore filled membrane was investigated in zinc−manganese (Zn−Mn) hybrid redox flow battery (HRFB). Among the studied electrolytes compositions, sulfate‐based electrolyte composition exhibits an improved performance at various conditions. Further, to minimize the ion crossover, the Daramic membrane is modified using polyacrylonitrile (PAN) as a pore filling agent. Hence, the flow cell fabricated with the optimized electrolyte and modified membrane enhanced the overall cell performance, particularly the energy efficiency of 75.45 % was achieved for the optimized conditions. As configured Zn−Mn flow cell system showed high avg. discharge plateau of 1.91 V at 10 mA cm−2. Further, the cell employed the modified membrane experienced the highly improved performance up to 40 mA cm−2. Besides that, the durability of the Zn−Mn system employing PAN filled Daramic membrane revealed the consistent cell performance over 100 galvanostatic charge‐discharge (GCD) cycles. Thus, the proposed sulfate‐based precursors electrolyte combinations and PAN filled Daramic membrane can be considered as a proficient candidate for obtaining better performance Zn−Mn flow cell system.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.