Development of a hybrid flow battery layout based on the derivatives of quinones and anthraquinones in alkaline solutions

Practical interest in redox flow batteries (RFB) has arisen in recent decades due to the intensive development of alternative energy (such as solar and wind) and the regulation of peak loads in industrial electrical networks. It turns out that large-scale energy storage devices to compensate for fluctuations in solar and wind energy generation and to reduce peak loads in industrial electrical networks and power supply systems for large households are more profitable when redox flow batteries are used. Firstly, they are very easily scalable, and secondly, the energy stored in such batteries is cheaper. In this work, the electrochemical behavior of some promising organic systems based on quinone, anthraquinone and their analogs in alkaline solutions was studied using cyclic voltammetry. The layouts of the flow batteries based on a hybrid redox system (anthraquinone sulfonic acid sodium salt/potassium ferrocyanide and hydroquinone sulfonic acid sodium salt/potassium ferrocyanide) were developed. The operating voltage of such RFBs was about 0.75 and 0.85 V, respectively.