Electrosynthesis of hydrogen peroxide in solutions of salts that form molecular addition products (peroxo solvates) with it

The possibility of electrosynthesis of hydrogen peroxide in the electroreduction of oxygen in a gas-diffusion electrode in solutions of salts that form the molecular addition products (peroxo solvates) with H₂O₂ was studied. In KF and potassium and sodium phosphate solutions, H₂O₂ was obtained at concentrations of 2.3–3.6 M at current densities of 0.1–0.15 A/cm² and current efficiencies of 75–92%. The resulting solutions were concentrated to 11–27 M to give solid peroxo solvates with high hydrogen peroxide contents (22–50%). These results demonstrate that the application of gas-diffusion electrodes for electrosynthesis of inorganic products can be significantly expanded.