Electrochemical Removal of Nitrate Using a Nanosheet Structured Co3O4/Ti Cathode: Effects of Temperature, Current and pH Adjusting

•Removal rate is the main factor affects electrochemical nitrate reduction application.•Nanosheet structured Co3O4 cathode is synthesized through electrodeposition.•Larger active surface area results in its faster removal rate than solid particle.•Temperature rising and current increasing can further improve nitrate reduction.•Adjusting the pH around neutral during the reaction can improve N2 selectivity.