Hydrogen peroxide synthesis by electro-reduction of O₂ to substitute the current anthraquinone process has attracted a great deal of attention. Low oxygen utilization rate and low hydrogen peroxide production remain obstacles to electro-Fenton application. In situ H₂O₂ generated by electrochemical reaction depends on the electrochemical performance of the cathode and the structure of the reactor. Here, novel graphite felt (GF) modified by La-doped CeO₂ (La–CeO₂) was developed as a cathode. A new double chamber electro-Fenton reactor was proposed, where an organic ultrafiltration membrane was used to prevent H₂O₂ from spreading to the anode. The effects of hydrothermal temperature, time and urea concentration on the electrochemical properties of graphite felt were investigated. The accumulated concentration of H₂O₂ on the modified cathode reached 218.4 mg·L^–1 in 1 h when the optimal conditions of hydrothermal temperature 120 °C and urea concentration 0.55% (mass) in 24 h. The degradation rate of methyl orange reached 98.29%. The new electro-Fenton reactor can efficiently produce hydrogen peroxide to degrade various organic substances and has a high potential for treating wastewater in the chemical industry.

_{通过电还原O 2}合成过氧化氢来替代目前的蒽醌法已经引起了极大的关注。氧气利用率低和过氧化氢产量低仍然是电芬顿应用的障碍。电化学反应产生的原位H ₂ O ₂取决于阴极的电化学性能和反应器的结构。在这里，开发了由 La 掺杂的 CeO ₂ (La–CeO ₂ ) 改性的新型石墨毡 (GF)作为阴极。提出了一种新型双室电芬顿反应器，其中使用有机超滤膜来防止H ₂ O ₂从传播到阳极。研究了水热温度、时间和尿素浓度对石墨毡电化学性能的影响。在水热温度120℃、尿素浓度0.55%(质量)24h的最佳条件下，修饰阴极上H ₂ O ₂的累积浓度在1h内达到218.4mg·L ^{- 1。}甲基橙的降解率达到98.29%。新型电芬顿反应器可以高效地产生过氧化氢来降解各种有机物，在处理化工行业的废水方面具有很大的潜力。