In Situ Electrochemical Generation of Hydrogen Peroxide in Alkaline Aqueous Solution by using an Unmodified Gas Diffusion Electrode

Abstract

Hydrogen peroxide (H2O2) is an oxidizing agent commonly used for various applications and is available in aqueous solution in a wide range of concentrations. This work describes the H2O2 electrogeneration process in alkaline medium (KOH 1.0 mol L−1), using an unmodified gas diffusion electrode (GDE) manufactured with Printex 6L carbon. The experiments were performed in a single‐compartment electrochemical cell equipped with a GDE as the working electrode, which was fed with N2 or O2 at a pressure of 0.2 bar. Electrolysis experiments were performed at a constant potential (−0.5≤E≤−1.4 V) for 90 min. The H2O2 concentration reached a maximum value of 3370 mg L−1 at −1.1 V (vs. Ag/AgCl), and H2O2 electrogeneration followed pseudo‐zero‐order kinetics with an apparent rate constant kapp=59.7 mg L−1 min−1. A low energy consumption of 8.0 kWh kg−1 was calculated for these electrogeneration conditions.

Catalytic activity of Fe3−Cu O4 (0 ≤x≤ 0.25) nanoparticles for the degradation of Amaranth food dye by heterogeneous electro-Fenton process

“…The residual and consumed H 2 O 2 were quantified at λ= 350 nm using the peroxymolybdate method as described in a previous work [47]. The determination of residual Fe 2+ and Fe 3+ ions (λ= 510 nm) was done using the phenanthroline colorimetric method recommended by the American Public Health Association [51].…”

“…The electrodegradation of the AM dye was carried out in single compartment According to a previous study, the H 2 O 2 electrogenerated at -1.1 V (vs. Ag/AgCl) was 3,370 mg L -1 [47].…”

Highly efficient electrosynthesis of hydrogen peroxide on a superhydrophobic three-phase interface by natural air diffusion

“…One of the industrial requirements of a suitable cathode for H 2 O 2 production is that it can work at high current density 58 . Barros et al operated a normal GDE at the current density of 212 mA cm −2 ; though the H 2 O 2 production could reach 44.9 mg h −1 cm −2 , the current efficiency was as low as 33.3% 59 . We subsequently increased the current density and observed that the production of H 2 O 2 increased linearly with its increase (R 2 = 0.995) within the scope of the investigation.…”

On-site H2O2 electrogeneration at a CoS2-based air-diffusion cathode for the electrochemical degradation of organic pollutants

“…However, the limited solubility and slow mass transport of O 2 in water impede the production of great concentrations of H 2 O 2 . The use of GDEs allows overcoming these drawbacks, thanks to their porous structure and the coexistence of a triple phase boundary (TPB) [10][11][12][13][14]. The use of divided cells significantly enhances the production of H 2 O 2 [4].…”