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The development of highly efficient cathode materials for the electro-catalytic oxidation of phenol from wastewater is of vital importance for environment protection. Herein, we develop an effective CeO 2 -CuO electrocatalyst for 2-electron oxygen reduction reaction (ORR) to generate H 2 O 2 , and then applied it as the cathode for the electro-catalytic oxidation of phenol. Results showed that the CeO 2 -CuO cathode with different contents of CuO exhibited a higher yield of H 2 O 2 than those of CuO and CeO 2 , and the highest yield of H 2 O 2 (114 mg L -1 ) was achieved with a CuO content of 13.4%. The resultant CeO 2 -CuO-13.4% cathode demonstrated a high degradation rate of 91% after 180 min, which was 1.82-fold and 1.52-fold higher than pure CuO (50%) and CeO 2 (60%) electrodes, respectively. Furthermore, the degradation rate of phenol via the electro-catalytic oxidation technology by using a CeO 2 -CuO cathode significantly outperformed that of the chemical oxidation approach. The outstanding degradation performance of the CeO 2 -CuO cathode is attributed to the high yield of H 2 O 2 and the strong interaction of CeO 2 and CuO.

Highly efficient degradation of phenol from wastewater via an electro-catalytic oxidation approach with a CeO2–CuO cathode

Highly efficient degradation of phenol from wastewater via an electro-catalytic oxidation approach with a CeO₂–CuO cathode