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• W3048593376 abstract "Hydrogen peroxide (H2O2)-based electrochemical advanced oxidation processes (EAOPs) have been widely attempted for various wastewater treatments. So far, stability tests of EAOPs are rarely addressed and the decay mechanism is still unclear. Here, three H2O2-based EAOP systems (electro-Fenton, photoelectro-Fenton, and photo+ electro-generated H2O2) were built for phenol degradation. More than 97% phenol was removed in all three EAOPs in 1 h at 10 mA·cm–2. As a key component in EAOPs, the cathodic H2O2 productivity is directly related to the performance of the system. We for the first time systematically investigated the decay mechanisms of the active cathode by operating the cathodes under multiple conditions over 200 h. Compared with the fresh cathode (H2O2 yield of 312 ± 22 mg·L–1·h–1 with a current efficiency of 84 ± 5% at 10 mA·cm–2), the performance of the cathode for H2O2 synthesis alone decayed by only 17.8%, whereas the H2O2 yields of cathodes operated in photoelectro-generated H2O2, electro-Fenton, and photoelectro-Fenton systems decayed by 60.0, 90.1, and 89.6%, respectively, with the synergistic effect of salt precipitation, •OH erosion, organic contamination, and optional Fe contamination. The lower current decay of 16.1–32.3% in the electrochemical tests manifested that the cathodes did not lose activity severely. Therefore, the significant decrease of H2O2 yield was because the active sites were altered to catalyze the four-electron oxygen reduction reaction, which was induced by the long-term erosion of •OH. Our findings provided new insights into cathode performance decay, offering significant information for the improvement of cathodic longevity in the future." @default.
• W3048593376 created "2020-08-18" @default.
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• W3048593376 date "2020-08-10" @default.
• W3048593376 modified "2023-10-16" @default.
• W3048593376 title "Revealing Decay Mechanisms of H₂O₂-Based Electrochemical Advanced Oxidation Processes after Long-Term Operation for Phenol Degradation" @default.
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• W3048593376 doi "https://doi.org/10.1021/acs.est.0c03233" @default.
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• W3048593376 hasPublicationYear "2020" @default.
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