Alkaline all-iron flow batteries possess intrinsic safety and low cost, demonstrating great potential for large-scale and long-duration energy storage. . Flow batteries offer energy storage solutions for various customers and applications, including utilities, as well as industrial, commercial, and residential uses. Their growth in grid-scale applications and microgrids are primary drivers of market expansion. There is a variety of designs and. . The rapid advancement of flow batteries offers a promising pathway to addressing global energy and environmental challenges. However, their commercial application is hindered by the issue of capacity decay resulting from the decomposition of iron complexes and ligand. . We demonstrate a rechargeable aqueous alkaline zinc–sulfur flow battery that comprises environmental materials zinc and sulfur as negative and positive active species. Meanwhile, a nickel-based electrode is also obtained by a two-step process to decrease the polarization of the sulfur redox. . Zinc-based flow battery is an energy storage technology with good application prospects because of its advantages of abundant raw materials, low cost, and environmental friendliness. The chemical stability of zinc electrodes exposed to electrolyte is a very important issue for zinc-based batteries.