Due to ever-increasing demands for efficient energy storage, research is crucial for a new generation of batteries, which are sustainable, low-cost and have increased energy density. such as Co and Ni. In contrast, organic cathode materials can be made out of abundant raw materials, enabling sustainable production and a lower carbon footprint. Additionally, organic materials possess lower solid-state diffusion limitations, enabling the accommodation of multivalent cations. Organic cathode materials have been proven to work in aluminium, magnesium and zinc batteries. In recent years aqueous zinc-ion batteries have attracted a lot of attention as one of the most promising candidates for large scale energy storage applications. The use of zinc metal offers advantages in terms of low toxicity, low cost, high abundance (Zn resources are at least 20 times higher than Li) and high specific capacity (820 mAhg -1 ). It also enables the use of aqueous electrolytes, which have high ionic conductivity and unlike organic electrolytes do not present a fire hazard. Since the first use of an organic cathode material based on dichloroisocyanuric acid in a lithium primary battery in 1969 several types of organic redox-active materials have been extensively explored, such as carbonyl compounds, conducting polymers, stable organic radicals, organo-sulfur compounds, and imine compounds with comparable or even superior electrochemical performances to conventional inorganic materials. To develop high-energy and high-power-density rechargeable batteries, active materials should possess multiple redox centers and high intrinsic electrical conductivity.