Efficient H2O2 electrogeneration at graphite felt modified via electrode polarity reversal: Utilization for organic pollutants degradation

•A novel and green cathode modification by electrode polarity reversal was first reported.•Increase in surface oxygen-containing groups and hydrophilic properties were observed.•For modified electrode, low current and neutral pH could support the highest H2O2 yield.•The modified graphite felt cathode exhibited good reproducibility and longevity.•Modified cathode in column reactor supported ibuprofen removal from simulated groundwater.