强化电化学原位产过氧化氢因素分析

针对活性碳纤维（ACF）阴极电还原氧气产过氧化氢（H2O2）效率较低的问题，将形稳电极Ru02/Ti、环氧树脂网格以及ACF组合作为复合阳极与电源的正极相连接，单独 ACF作为阴极与电源的负极相连接，建立了高效产H2O2的电化学系统。通过有无外通氧气对H2O2产量对比实验发现，此体系无需外加氧气。详细研究了电流密度、初始pH、转速和电解质浓度等因素对系统产H2O2的影响。H2O2产量随电流密度的增大而增大，但电流密度达到20.82 mA·cm-2后，继续增大电流密度H2O2产量反而降低；酸性条件有利于H2O2生成；H2O2产量随转速的增大而增加，但转速达到500 r·min-1时，继续增大转速，H2O2生成量反而降低；H2O2产量随电解质浓度增大逐渐增大，但电解质浓度较高时，H2O2产量无明显变化；此电化学系统经8次重复使用后，H2O2的生成量基本维持稳定，表明此电化学体系可高效稳定产生H2O2。

Enhancement of in situ electro-generated hydrogen peroxide via electrochemical process

To overcome the low hydrogen peroxide (H2O2) generation efficiency obtained by reducing oxygen at an activated carbon fiber (ACF) cathode, a combined ACF/RuO2-Ti electrode separated using an epoxy resin grid was designed to efficiently generate H2O2. In this system, the combined electrode was directly connected to the positive direct current (DC) electrode, while the ACF electrode was connected to the negative DC electrode. O2 aeration had no effect on the quantity of H2O2 generated. In addition, the effects of current density, initial pH, stirrer strength, and electrolyte concentration on H2O2 generation were investigated in detail. The amount of H2O2 generated increased with an increase in applied current density up to 20.82 mA·cm-2, after which H2O2 generation decreased. Furthermore, H2O2 generation was favored under acidic conditions and upon increasing the stirrer speed to 500 r·min-1, after which the concentration of H2O2 decreased gradually. A high electrolyte concentration had no obvious effect on H2O2 generation. Reuse of the system eight times gave no change in terms of H2O2 generation and so we could conclude that our novel system could generate H2O2 efficiently and stably.