Graphite felt electrochemically modified in H2SO4 solution used as a cathode to produce H2O2 for pre-oxidation of drinking water

• Oxygen-containing groups were grafted onto the GF surface by electrochemical modification.
• COOH groups on the GF surface are a benefit for the 2-electron-reduction of O2.
• Improved electrochemical activity towards H2O2 production at modified GF.

The efficiency of graphite felt (GF) as a cathode to electro-generate H2O2 in neutral water was improved after the GF was electrochemically oxidized in H2SO4 solution. Raman spectra, SEM and XPS showed that certain oxygen-containing functional groups were introduced onto the surface of the GF after modification. The electrochemical behavior of the electrodes showed that the 2-electron-reduction of oxygen gas on the modified GF cathode was enhanced which is beneficial for the electrochemical generation of H2O2 in neutral water. The electrolysis tests in static and flowing cells showed that the efficiency of electro-generation of H2O2 for the treated GF increased by 6 times as compared with the original one.

Oxygen-doped graphite felt (GF) materials, prepared by electrochemical oxidation in acid medium, are highly selective and sensitive for oxygen adsorption.Figure optionsDownload as PowerPoint slide