Preparation Of Electrocatalyst Derived From Fungal Hyphae And Its Catalytical Activity For Hydrogen Peroxide Production

With the rapid development of economy,topics associated with energy and environment have gradually become the focus of talk in people’s daily lives.Hydrogen peroxide is widely applied in various industrial fabrication as a kind of important industrial chemical.At present,although the routes to synthesize hydrogen peroxide in industries have been mature,but they are very harmful to environment.Synthesizing hydrogen peroxide via electrochemistry is a promising and green environmentally friendly method.The application prospect of noble metal catalyst with the ability of producing hydrogen peroxide efficiently via electrocatalytical method have been limited due to its high cost and scarcity.Researching the carbon based materials which belong to not precious metals have been the focus of attention between groups recently.Therefore,our group used fungal hyphae(containing bioconcentrated dye)to prepare a kind of electrocatalyst with high efficiency towards hydrogen peroxide generation.Chapter one introduces the synthesis method of H2O2 and the types of catalysts for electrochemical synthesis of H2O2 in detail.Chapter two mainly introduces the preparation process of N,O,P co-doped carbon materials prepared by fungal hyphae and the results of SEM,TEM,XPS,Raman,BET and so on.Indicating that the carbon material has a high specific surface area and large pore volume.Chapter three discusses the experimental results show that the carbon material prepared by the dye-added fungal hyphae has higher electrocatalytic activity,and the carbon material sintered at 800℃ has the best performance in both alkaline and neutral solutions via the electrochemical test.Experimental results indicated that N-O-P-C-800 obtained the H2O2 production rate of 1470 mmol·gcatalyst-1 ·-1 and the faraday selectivity of 97.0%with the help of catalyst measured at a potential of 0.25 V in alkaline solution,which can sustain high efficiency and H2O2 productivity for 18 cycles,exhibiting good activity,selectivity,and stability.A flow cell equipped with the carbon electrocatalyst synthesized by us as cathode and IrO2 as anode exhibited excellent Faradaic efficiency,H2O2 productivity,and energetic efficiency in alkaline media.In addition,high faradaic efficiency and H2O2 productivity can maintain when powered by commercial dry battery(1.5V)or by solar-energy battery(2.5V or 3.0V).This is helpful in developing an electrocatalyst for H2O2 production and practical industrial application of oxygen reduction to H2O2 by electrocatalysis method.This low-cost,simple,and easily expended approach offers insight for developing a novel electrocatalyst for other electrochemical reactions,such as hydrogen evolution reactions,oxygen evolution reactions,and CO2 reduction reactions.