An undivided zinc-cerium hybrid redox flow battery is proposed. High discharge cell voltage of c.a. 2.1 V at 20 mA cm-2 and an average energy efficiency of 75 % were obtained. The cerium half-cell reaction was highly reversible on a carbon felt electrode with less than a 15 mV change between charge and discharge cycles. The limiting factor for extended cycling was zinc negative electrode, as residual zinc remained on the electrode after discharge. The battery self-discharge was evaluated by monitoring the open-circuit cell voltage, the capacity was found to last for approximately 7 hours after being charged for 30 minute
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