二氧化钛改性炭黑催化剂电合成H2O2反应器设计与性能优化OA

The direct electrosynthesis of hydrogen peroxide(H2O2)via a two-electron oxygen reduction reaction(2e-ORR)offers a viable alternative to the energy-intensive anthraquinone oxidation process.However,transitioning from laboratory-scale to industrial-scale electrosynthesis of H2O2 poses a significant obstacle in developing reactors with large electrode areas.Therefore,an H-cell reactor and a gas diffusion reactor with 81 cm2 cathode are designed and a reaction system for electrosynthesis of H2 O2 is constructed using titanium dioxide modified carbon black as cathode catalyst.Due to ineffective oxygen mass transfer and heat dissipation,the H-cell reactor struggles to operate efficiently at current densities exceeding 50 mA/cm2.In contrast,the gas diffusion reactor achieves a high H2O2 production rate of 525.8 mmol/(L·h)at 100 mA/cm2 with a Faradaic efficiency of 84％.By adjusting the operating parameters such as current density and catholyte flow rate,the lowest total cost of electrolyte and electrical energy for electrosynthesis of H2 O2 in this gas diffusion reactor is 5.149 RMB/kg.This work provides a feasible strategy for designing a low-cost decentralized H2 O2 production system.