| Summary: | As one of the most promising methods for H<sub>2</sub>O<sub>2</sub> production, H<sub>2</sub>O<sub>2</sub> electroproduction has received increasingly more attention. In this study, a spherical particle polydopamine (pDA) modified carbon felt (noted as ht-pDA/ACF) for H<sub>2</sub>O<sub>2</sub> production was fabricated. At a constant potential of 2.0 V and pH of 1.0, the H<sub>2</sub>O<sub>2</sub> production of the ht-pDA/ACF cathode reached 220 mg/L after 6 h of electrolyzing, compared to the 30 mg/L H<sub>2</sub>O<sub>2</sub> production of raw carbon felt. Firstly, the spherical pDA exposes more active sites that are favorable to the 2e<sup>−</sup> ORR compared to pDA film. Secondly, the ring cleavage and re-cyclization of indole structure in the pDA during electrolyzing could form the radicals that act as the intermediate to the H<sub>2</sub>O<sub>2</sub> formation. This research exhibits a low-cost method to modify carbon materials for effective H<sub>2</sub>O<sub>2</sub> electroproduction. The ht-pDA/ACF cathode is promising for green H<sub>2</sub>O<sub>2</sub> production and wastewater treatment.
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