Abstract
As one of the most promising methods for H2O2 production, H2O2 electroproduction has received increasingly more attention. In this study, a spherical particle polydopamine (pDA) modified carbon felt (noted as ht-pDA/ACF) for H2O2 production was fabricated. At a constant potential of 2.0 V and pH of 1.0, the H2O2 production of the ht-pDA/ACF cathode reached 220 mg/L after 6 h of electrolyzing, compared to the 30 mg/L H2O2 production of raw carbon felt. Firstly, the spherical pDA exposes more active sites that are favorable to the 2e− 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 H2O2 formation. This research exhibits a low-cost method to modify carbon materials for effective H2O2 electroproduction. The ht-pDA/ACF cathode is promising for green H2O2 production and wastewater treatment.
Highlights
Hydrogen peroxide (H2 O2 ), a valuable environmentally friendly and clean oxidant that emits only water as a byproduct, has received increasing demands in the areas of chemical synthesis, pulp bleaching, pharmaceutical industry, wastewater treatment and so on [1]
To evaluate the electrochemical activity and selectivity of ht-pDA/acid-treated carbon felt (ACF), CV was firstly tested in an undivided cell from 0 V vs. Ag/AgCl to 1.0 V vs. Ag/AgCl
Two sharp peaks at 1502 and 1285 cm−1 appear on the spectra of ht-pDA/ACF, which can be assigned to the indole structure and the stretching vibration of -C-N according to the previous literature [23]
Summary
Hydrogen peroxide (H2 O2 ), a valuable environmentally friendly and clean oxidant that emits only water as a byproduct, has received increasing demands in the areas of chemical synthesis, pulp bleaching, pharmaceutical industry, wastewater treatment and so on [1]. The most efficient catalysts for the 2e− ORR are noble-metal-based materials (e.g., PdAu [7], Pt-Hg [8] and Pd-Hg [9]), which require a small overpotential and possess high. Carbon nitride [12]) and doping heteroatoms (e.g., O [13], N [14], S [15], etc.) Such modifications usually suffer from complicated procedures or harsh pH condition, and impede the intensive application to produce H2 O2. The ht-pDA/ACF cathode exhibited high electrocatalytic activity and further H2 O2 production via the two-electron ORR in acid electrolyte. This research will provide a new way to prepare carbon-based electrocatalyst for H2 O2 production in acid condition, which has potential applications in the industry
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