Although the electrosynthesis of hydrogen peroxide (H₂O₂) using gas diffusion electrodes (GDE) is a viable option for the production of this oxidizing agent in advanced oxidation processes (AOP) for wastewater treatment, the quest for more efficient electrodes is still regarded a matter of great importance in this area. The present study sought to investigate different redox organic compounds employed as modifiers of carbon black Printex L6 (CP) with the aim of increasing H₂O₂ production using carbon-based electrodes. Varying amounts of the modifiers, including Sudan Red 7B (SR7B), methyl-p-benzoquinone (MPB), anthraflavic acid (AA) and anthraquinone-2-carboxylic acid (A2CA), were added to carbon black, where the electrochemical activity was studied by applying a microporous catalyst layer on a rotating ring-disk electrode (RRDE). The materials containing 0.5% of SR7B and 5.0% of MPB increased the current efficiency for the electrogeneration of hydrogen peroxide to 86.2% and 85.5%, respectively, compared to 82.8% obtained for unmodified carbon. Carbon Printex L6 gas diffusion electrodes modified with 0.5% of SR7B were studied and the following results were obtained: the application of current density of 75 mA cm⁻² led to the production of 1020.1 mg L^-1 of H₂O₂, with an energy consumption of 118.0 kW h kg^-1, apparent kinetic constant of 37.34 mg L^-1 min^-1 and current efficiency of 17.87%. Conversely, the use of GDE with unmodified carbon resulted in the production of relatively less quantity of H₂O₂ which amounted to 717.3 mg L^-1, with more energy consumption of 168.5 kW h kg^-1, lower apparent kinetic constant of 21.41 mg L^-1 min^-1 and lower current efficiency of 12.57%. Based on these results, carbon Printex L6 GDE modified with 0.5% of Sudan Red 7B is seen as a suitable alternative for the production of high amounts of H₂O₂ which can be applied in advanced oxidation processes in acidic medium.

尽管使用气体扩散电极（GDE）电合成过氧化氢（H ₂ O ₂）是在废水处理的高级氧化工艺（AOP）中生产该氧化剂的可行选择，但仍需要寻求更高效的电极在这方面非常重要。本研究试图研究用作炭黑Printex L6（CP）改性剂的不同氧化还原有机化合物，以增加H ₂ O ₂的目的。使用碳基电极进行生产。向炭黑中添加了不同数量的改性剂，包括苏丹红7B（SR7B），甲基对苯醌（MPB），蒽黄酸（AA）和蒽醌-2-羧酸（A2CA），其电化学活性为通过在旋转的环形盘电极（RRDE）上施加微孔催化剂层进行研究。含有0.5％SR7B和5.0％MPB的材料将过氧​​化氢的发电电流效率分别提高到86.2％和85.5％，相比之下，未改性碳的效率为82.8％。研究了用0.5％的SR7B改性的Carbon Printex L6气体扩散电极，并获得以下结果：施加75 mA cm ^-2的电流密度导致产生1020.1 mg L ^-1H ₂ O ₂的能量消耗为118.0 kW h kg ^-1，表观动力学常数为37.34 mg L ^-1  min ^-1，电流效率为17.87％。相反，将GDE与未改性碳一起使用会产生相对较少量的H ₂ O ₂，总计717.3 mg L ^-1，能耗更高，为168.5 kW h kg ^-1，较低的表观动力学常数为21.41 mg L ^-1 分钟^-1电流效率降低12.57％。基于这些结果，用0.5％的苏丹红7B改性的Printex L6 GDE碳被视为生产大量H ₂ O ₂的合适替代品，该产品可用于酸性介质中的高级氧化工艺。