The increasing deployment of intermittent energy source such as solar and wind has raised the need of large storage device to improve grid reliability and power quality. Redox flow batteries (RFBs) are regarded as one of the most promising candidates, because of simple design, good scalability, good cycle efficiency, and reliable long lifespan. Among them, zinc-bromine flow battery (ZBB) is considered as one of the most promising candidates for large-scale energy storage due to the high solubility of Zn ion and low cost which is attributed to the abundance of zinc compounds. Combined with high cell voltage (1.84V), ZBB shows up to 440Wh/kg with a practical energy density of around 65-75 Wh/kg. However, widespread application of ZBB has been impeded due to its low power density, zinc dendrite, or hydrogen evolution. In this work, we investigate the effect of zinc powder-based anode modification on the electrochemical characteristics of zinc-bromine flow battery.