Enhanced H 2 O 2 Generation via Two-Electron Water Oxidation on Multilayer Network BDD: Performance and Mechanistic Insights

Hydrogen peroxide (H 2 O 2 ) is an environmentally benign yet versatile oxidizing agent with broad applications across academic and industrial fields, including sterilization, sewage treatment and chemical synthesis. The electrochemical two-electron water oxidation (2e - WOR) pathway as an effective method for in situ electrosynthesis of H 2 O 2, is not only environmentally friendly and economical, but also can be combined with appropriate reduction reactions to achieve the large-scale synthesis of high-value-added chemicals. This paper reports the preparation of three different boron-doped diamond (BDD) electrodes by hot filament chemical vapor deposition (HFCVD) on titanium (Ti) plate/multilayer network Ti woven mesh substrates. The multilayer network BDD electrodes (MN-BDD 15 and MN-BDD 9 ) exhibited significantly larger electrochemically active surface areas than the flat plate BDD electrode (BDD 9 ), measuring 28.00 and 16.70 times that of BDD 9, respectively. Correspondingly, the electron transfer resistances ( R ct ) for BDD 9, MN-BDD 9 and MN-BDD 15 were determined to be 57.90, 0.79, and 0.54 Ω, respectively. Notably, the MN-BDD 15 electrode demonstrated superior performance, achieving a Faradaic efficiency (FE) of 25.70% at a current density of 20 mA cm –2 . Further analysis confirmed that both hydroxyl radical ( • OH) production and mass transfer efficiency was dramatically enhanced in MN-BDD 15 compared to BDD 9 . Under identical conditions, the H 2 O 2 yield of MN-BDD 15 was 15.00 times higher than that of the BDD 9, proving that the multilayer network BDD is a promising high-performance electrode material for efficient electrocatalytic oxidation synthesis of H 2 O 2 .