Gas Diffusion Electrode Manufactured By Acetylene Black For Electrochemical Generration Hydrogen Peroxide

Hydrogen peroxide is an efficient and environmentally friendly oxidant and has been widely used in green synthesis, wastewater treatment, sanitation, and many other fields. Hydrogen peroxide at high concentrations has a tendency of rapid decomposition and even explosion, particularly when exposed to high temperatures and impurities. Therefore, the transportation and storage of hydrogen peroxide are of safe risk, limiting wide applications in different fields.In this context, the experiment with acetylene black as the main material, mainly study on nitrate liquid phase oxidation of carbon materials as catalyst for the reduction of O2, and prepared untreated acetylene black gas diffusion electrode and treated acetylene black gas diffusion electrode, while carrying out the performance and test method of electrochemical synthesis of H2O2. The performance of Raman, FT-IR, XPS, TG, XRD and SEM was used to characterize the performance of the gas diffusion electrode. Through both RRDE and LSV electrochemical testing system to carry out the cathodic oxygen reduction mechanism research; also analyzes the different current density, different temperature, cathode electrolyte concentration, different kinds of cathode electrolyte solution and anode whether additions of diaphragm, test and different electrode stability on H2O2 yield in parallel.The SEM was used to characterize the acetylene black. The results showed that the diffusion layer and the catalyst layer of the electrode had good structure of micro pores, which was favorable for the adsorption and diffusion of the gas, and increased the H2O2 yield. By Raman, XPS and IR spectra analysis that hot nitric acid treated acetylene black toner the surface containing oxygen functional group content increased. The electrode diffusion layer and the catalyst layer calcination temperature were selected to be 250? and 150? respectively. And the electrode had good thermal stability at the temperature of TG. The RRDE and LSV tests showed that the reaction of O2 with hydrogen peroxide in alkaline solution followed the 2 electron reduction mechanism.Treatment of acetylene black gas diffusion electrode electrolysis experiment is obtained through the study. The experimental results show that: in under optimized conditions for 150 min of electrolysis can obtain maximum zero order kinetic constants Kapp=312.69 mg·L-1·min-1 and maximum production of H2O2 was 39344.55 mg·L-1, electric solution 300 min of H2O2 concentration increased to 59101.05 mg·L-1. In the five times its higher concentration can be to 37267.15 mg·L-1 subsequently in the top ten times in the process of using the always maintain a higher hydrogen peroxide production 34330.67 mg·L-1. After 15 times to 20 times the yield significantly reduced 29428.08 to 25043.43 mg·L-1 basic drop is about 63% of the initial. If there is to get higher concentrations of hydrogen peroxide content can be in use for the fifth time after replacement, processing of acetylene black gas diffusion electrode than untreated acetylene black gas diffusion electrode either in production or in the yield and other aspects occupy certain advantages.