Organic redox flow batteries could be further classified into two categories: Aqueous Organic Redox Flow Batteries (AORFBs) and Non-aqueous Organic Redox Flow Batteries (NAORFBs). AORFBs use water as solvent for electrolyte materials while NAORFBs employ organic solvents to dissolve redox active materials. Depending on using one or two organic redox active electrolytes as anode and/or cathode, AORFBs and NAORFBs can be further divided into total organic systems and hybrid organic systems that use inorganic materials for anode or cathode. In larger-scale energy storage, Due to lower solvent cost and higher conductivity AORFBs have greater commercial potential than NAORFBs, as well as the safety advantages of water-based electrolytes over non-aqueous electrolytes. The advantage of NAORFBs lies in their much larger voltage window and ability to possibly occupy less physical space for an installed storage facility. The content below lists materials advances for these organic based systems.