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side reactions (gas evolution) as can be hydrogen evolution reaction (HER). All of these help to elevate the reachable energy and power densities of the battery. o Cathode, which lacks of a fast kinetics. Deposition of a catalyst over graphite felt, as it is ceria (CeO2), to aid the positive redox reaction (VO2+/VO2+) making it faster, as well as improve the efficiencies and accessible capacity of the battery. Despite the fact that the systems described previously were already proposed several decades ago, they are still the subject of current research. These systems show several inconvenient related to the vanadium abundance, the cost of it, as well as the geopolitical impact caused by its mining. As a consequence, the implementation of organic redox active species is a first step in order to avoid these disadvantages. Organic molecules are abundant, tunable by synthetic pathways and an improved kinetic with the possibility of having two-electron transfer process (as happens to quinones)1,2. Such a battery has the potential to meet the demanding cost, durability, eco-friendliness, and sustainability requirements for grid-scale electrical energy storage. Furthermore, this system has been studied targeting on a Quinone-based redox flow battery. After the selection of the catholyte (benzoquinone-based molecules as p-benzoquinone, o-benzoquinone and disodium 4,5-dihydroxy-1,3- benzenedisulfonate) and the anolyte (Anthraquinone-2,7-disulfonic acid disodium salt) in a methanosulfonic acid solvent, the next step has been improving the electrode technology on both single cell compartments to promote positive and negative redox reactions. In order to do that surface modification has been done, by means of nitrogen and oxygen functionalization using different methods. Finally, it has been commented the present of all-Vanadium and Aqueous Organic Redox Flow Batteries, as well as some future perspective of both technologies. 13PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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