Research Of The Anthraquinone Flow Battery And Related Critical Materials

With the environmental pollution and energy crisis becoming more and more serious,the environmentally friendly energy becomes the urgent need for sustainable development.In recent years,the use of renewable energy,especially solar energy and wind energy,has been paid more and more attention.However,the use of renewable energy suffers from a challenge due to their intermittent.The development of large-scale energy storage technology is an effective way to solve this problem,it can enable load leveling and peak shaving to balance the generation and consumption of power,so as to improve the stability and security of power grid.Because of its good cycle efficiency and strong design ability,the flow battery has become a research hotspot.A large majority of flow battery technologies depend on the redox metal materials,which limits the application of the flow battery.In this paper,a kind of flow battery with hydroxyl anthraquinone as the negative electrolyte and the ferrocyanide as the positive electrolyte is proposed.Anthraquinone is ubiquitous and also can be artificially synthesized,which is not only not limited by reserves,but also more environmentally friendly.The use of Anthraquinone greatly reduces the price of flow battery.Besides,ferrocyanide is a food additive.Therefore,the organic redox flow battery has a great potential,and it become a new hotspot in the research of flow battery.In this paper,the physical and chemical properties of three kinds of anthraquinone were studied.The FT-IR spectra and the UV-Vis spectra in four solvents were compared.The electrochemical performance test show that the 1,4-Dihydroxyanthraquinone(1,4-DHAQ),1,8-Dihydroxyanthraquinone and 2,6-Dihydroxyanthraquinone has better electrochemical reversibility in alkaline conditions.The three kinds of hydroxyl anthraquinone were used as negative electrode,and the ferricyanide as a positive electrode of a flow cell.Then the electrochemical impedance spectroscopy(EIS)and the performance of the battery in different temperatures conditions were measured.The charge and discharge performance of the battery is better when the 2,6-Dihydroxyanthraquinone are used as the anode active material.In this paper,Nafion membrane and Nafion/PTFE composite membrane were prepared by solution casting method.The two kinds of films were analyzed by UV-Vis spectroscopy,FT-IR spectroscopy,water absorption and swelling ratio.The two kinds of membranes were used as the separator of the flow battery,and 1,4-Dihydroxyanthraquinone and ferrocyanide were used as the active material of the flow battery.The AC impedance and the charging and discharging performance of the battery were tested.The results show that the Nafion/PTFE composite membrane can be used as an alternative to the Nafion membrane in anthraquinone flow battery,which largely reduces the cost of the anthraquinone flow battery.Based on the good performance of the polyvinyl alcohol/ phosphomolybdic acid composite membrane in the zinc bromine flow battery,we used this membrane as the separator of the anthraquinone liquid flow battery and the battery shows good performance too.The intercrossed carbon nanorings was prepared and intend to modify the electrode of the flow battery.We used FT-IR and XRD test to study the structure and composition of the intercrossed carbon nanorings.Because of the poor reproducibility and low yield of the synthesis of intercrossed carbon nanorings,no modification of the electrode was carried out.In this paper,a new method for the synthesis of carbon nanomaterials is proposed.