A novel three-dimensional flow-through graphite felt-matrix cathode for in-situ hydrogen peroxide generation in multi-environment systems-Multiphysics modeling for in-situ hydrogen peroxide generation.

In order to achieve in-situ H2O2 generation in multi-environment systems, polyvinylpyrrolidone (PVP) and modified carbon nitride (t-g-C3N4) are co-doped onto graphite felt-matrix (GF-matrix) by electrodeposition to develop a novel cathode electrode. By means of 3D-X-ray CT, High-Resolution Transmission Electron Microscope (HRTEM), X-ray Photoelectron Spectrometer (XPS), Raman and Electrochemical Workstation, microscopic physical-chemical properties of materials are researched to optimize the electrode structure. Results show that the optimal electrode presents over H2O2 production rate of 2000 mgL-1·h-1, and as high as current efficiency of 93% to 98% in simulated freshwater (50 mM Na2SO4, pH = 1-12) at 20 mAcm-2. Furthermore, we built an original three-dimensional (3D) flow-through GF-matrix cathode model on H2O2 generation in simulated freshwater, explaining solution pH change reasons from solution inlet to outlet.