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As an important green-oxidant,hydrogen peroxide (H2O2) has been directly synthesized via hydrogen-oxygen dielectric barrier discharge (DBD) plasma in gas phase,without using organic solvent or catalyst [1-5].High reaction efficiency and high purity of H2O2 product makes this process extensive application potential,especially in electronic industry and aviation industry.However,risk caused by high discharge-voltage and high energy consumption become the most important problems for application.