Research On Hydrogen Peroxide Synthesis By PEDOT/CC In Spe Electrolytic Cell

Hydrogen peroxide（H₂O₂）is an environmentally friendly and widely used industrial raw material.The electrochemical synthesis of hydrogen peroxide is often safer than traditional anthraquinone and hydrogen oxygen direct synthesis methods,resulting in purer products and enabling dispersed in-situ production of hydrogen peroxide.This can effectively reduce the storage and transportation costs.In order to achieve efficient H₂O₂ electrosynthesis,catalytic materials and electrochemical reactor design play equally important roles.Based on this,this paper prepared a kind of PEDOT/CC electrode material with high selectivity and catalytic activity,and applied it as a membrane electrode assembly（MEA）in the solid polymer electrolyte（SPE）electrolytic cell to explore the performance of H₂O₂ synthesis.Conducting polymer PEDOT（poly 3,4-ethylenedioxythiophene）was polymerized on carbon cloth by electrodeposition for in-situ synthesis of hydrogen peroxide.The electrochemical testing has verified that PEDOT/CC catalyzed 2-electron oxygen reduction reaction to synthesize hydrogen peroxide has good catalytic activity and selectivity.Based on the LSV test results showing the position of the 2-electron oxygen reduction peak,the synthesis effect of hydrogen peroxide under different potentials was investigated.The results showed that the hydrogen peroxide synthesis was highest at a potential of-0.9 V（vs.Ag/Ag Cl）,and the current efficiency reached 72.54%.In order to solve the slow electron transfer rate of the electrode and the possible reoxidation process of hydrogen peroxide in the ordinary electrolytic cell,the PEDOT/CC membrane electrode assembly was applied to the SPE electrolytic cell to synthesize hydrogen peroxide.The optimal conditions and industrial feasibility of hydrogen peroxide synthesis were also explored.The results show that PEDOT/CC-MEA has a higher current density and faster electron transfer rate compared to PEDOT/CC.Adjusting the operating conditions of the device,the results showed that the best synthesis effect of hydrogen peroxide was achieved when the GDE method was applied,with a hot pressing time of 30 seconds,an electrolyte pH value of about 3,and an electrolysis voltage of-2.3 V.Comparing the synthetic hydrogen peroxide in the SPE electrolytic cell with the ordinary electrolytic cell,it can be found that the SPE electrolytic cell has higher hydrogen peroxide accumulation concentration(1162.45 mg L^-1),faster synthesis rate(2.91 mg cm^-2 h^-1)and better current efficiency（90.01%）.In addition,the use of air to synthesize hydrogen peroxide can still reach a high concentration(765.69 mg L^-1)within 1 hour,which can effectively reduce the operating cost of the entire system and be significant for industrial applications.In order to further improve the synthesis of hydrogen peroxide and meet the long-term continuous synthesis under industrial application,the SPE electrolytic cell was further optimized.A dual-membrane three chamber SPE electrolytic cell was designed and built.Dual membranes are used to separate an independent chamber between the cathode and anode for the synthesis of hydrogen peroxide.An SPE layer is added to achieve ion transport and the circulation flow effect of hydrogen peroxide.The electrochemical test results show that the reactor has good catalytic ability for synthesizing hydrogen peroxide,and has the best hydrogen peroxide yield(3.38 mg cm^-2 h^-1)when the thickness of the SPE layer is 3 mm.By changing the appropriate water flow rate,the hydrogen peroxide synthesis can be effectively controlled to meet more practical application needs.