Hydrogen peroxide (H₂O₂) is electrochemically produced via oxygen (O₂) reduction on a carbon cathode surface. In order to enhance the production of H₂O₂, anodic loss pathways, which significantly reduce the overall H₂O₂ production rate, should be inhibited. In this study, we investigate the effects of organic electron donors (i.e., typical chemical contaminants) on the anodic loss pathways of H₂O₂ in a single-cell electrochemical reactor that employs an anode composed of TiO₂ over-coated on a mixed-metal oxide ohmic contact catalyst, Ir_0.7Ta_0.3O₂, deposited on a Ti-metal that is coupled with a graphite rod cathode in a sodium sulfate (Na₂SO₄) electrolyte that is saturated with oxygen (O₂). Organic electron donors are shown to enhance the electrochemical production of H₂O₂, while simultaneously undergoing oxidative degradation. The observed positive effect of organic electron donors on the electrochemical production of H₂O₂ is due in part to a preferential adsorption of organic substrates on the TiO₂ outer layer of the anode. The sorption of the organic electron donors inhibits the formation of surficial titanium hydroperoxo species (Ti-OOH) on the anode surface. The organic sorbates also act as scavengers of surface-bound hydroxyl radical Ti-OH. As a result, the decomposition of H₂O₂ on the anode surface is significantly reduced. The cathodic production rate of H₂O₂ at low pH is enhanced due to proton coupled electron transfer (PCET) to O₂, while the anodic decomposition of H₂O₂ is inhibited due to electrostatic interactions between negatively-charged organic substrates and a positively-charged outer surface of the anode (TiO₂ pH_zpc = 5.8) at low pH.

过氧化氢 (H ₂ O ₂ ) 是通过在碳阴极表面上的氧 (O ₂ ) 还原而电化学产生的。为了提高H _{2 O 2 的产生，应抑制显着降低整体H 2} O ₂产率的阳极_损失途径_。在这项研究中，我们研究了有机电子供体（即典型的化学污染物）对单电池电化学反应器中H ₂ O _{2阳极损失途径的影响，该反应器采用由 TiO 2}组成的阳极覆盖在混合材料上。 -金属氧化物欧姆接触催化剂，Ir _0.7Ta _0.3 O ₂ ，​​沉积在钛金属上，该钛金属与在氧饱和的硫酸钠 (Na ₂ SO _{4 ) 电解质中的石墨棒阴极耦合 (O 2} )。有机电子供体显示可增强 H ₂ O ₂的电化学产生，同时进行氧化降解。观察到的有机电子供体对电化学生产 H ₂ O ₂的积极影响部分是由于有机底物优先吸附在 TiO _2上阳极的外层。有机电子供体的吸附抑制了阳极表面表面氢过氧钛物质 (Ti-OOH) 的形成。有机山梨酸盐还充当表面结合的羟基自由基Ti-OH 的清除剂。结果，阳极表面上H ₂ O _{2的分解显着减少。}由于质子耦合电子转移 (PCET) 到 O _{2 ，​​在低 pH 条件下 H 2} O ₂的阴极产率得到提高，而由于带负电的有机底物和 A 之间的静电相互作用，抑制了 H ₂ O ₂的阳极分解。阳极外表面带正电（TiO₂ pH _zpc  = 5.8) 在低 pH 条件下。