Electro-Fenton (EF) is one of the promising clean and renewable technologies for organic pollutant control. However, insufficient hydrogen peroxide (H₂O₂) generation and the subsequent hydroxyl radicals (^•OH) conversion still prevent the wide applications of EF. Herein, we report a Ce-doped vertically aligned α-FeOOH nanoflakes anchored on a carbon felt (CF) cathode for EF operation. In this system, a high concentration H₂O₂ (113.6 mg/L on 4 cm² cathode) is generated in 60 min, and being efficiently catalyzed to ^•OH by virtue of the active nanoedge (1.6 nm thickness) of Ce-doped α-FeOOH. The ^•OH production rate is calculated as high as 4.2 mM/W/cm²/min, which is ∼6.6-fold higher compared with the unmodified CF electrode. Moreover, this novel cathode achieves a complete removal (100% removal rate) of ultrahigh concentration chloramphenicol (1.1 mM, 355 mg/L) in 8 h and a high mineralization rate (94%) in 29 h in a scaled-up EF system. Density functional theory calculations (DFT) reveal that the Ce doping in α-FeOOH greatly promotes the conversion of H₂O₂ into ^•OH. This study not only offers a novel cathode structure for EF process but also opens radically new prospects for applied environmental catalysis.

中文翻译：

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纳米边缘上的​​双功能催化协同作用：用于有机污染物控制的定向 Ce-Fe 双金属芬顿电催化剂

Electro-Fenton (EF) 是一种很有前途的清洁和可再生有机污染物控制技术。然而，过氧化氢 (H ₂ O ₂ ) 生成不足和随后的羟基自由基 ( ^• OH) 转化仍然阻碍了 EF 的广泛应用。在此，我们报告了一种固定在碳毡 (CF) 阴极上用于 EF 操作的 Ce 掺杂的垂直排列的 α-FeO​​OH 纳米薄片。在该系统中，高浓度 H ₂ O ₂（4 cm ²阴极上的 113.6 mg/L ）在 60 分钟内产生，并通过 Ce 掺杂的活性纳米边缘（1.6 nm 厚度）有效催化为^• OH α-FeO​​OH。该^•计算出的 OH 生成速率高达 4.2 mM/W/cm ² /min，与未修饰的 CF 电极相比，高约 6.6 倍。此外，这种新型阴极在放大的 EF 系统中实现了在 8 小时内完全去除（100% 去除率）超高浓度氯霉素（1.1 mM，355 mg/L）和在 29 小时内实现高矿化率（94%） . 密度泛函理论计算 (DFT) 表明，α-FeO​​OH 中的 Ce 掺杂极大地促进了 H ₂ O ₂向^• OH的转化。这项研究不仅为 EF 工艺提供了一种新的阴极结构，而且为应用环境催化开辟了全新的前景。