A method for operating an electrolysis unit , - wherein hydrogen gas and oxygen gas are produced with the electrolysis unit using electrodes , wherein a plurality of anodes and cathodes are provided as electrodes , and wherein at least one electrode out of the electrodes comprises a metal plate and no carbon fibers, characterized in that - at least one other of the electrodes comprises carbon fibers formed into a sheet-like shape of carbon fibers , wherein each sheet-like shape of carbon fibers is fixed between two respective plates which jointly form the corresponding electrode , and - the anodes and cathodes are alternatingly arranged on top of each other to form an electrode stack, wherein an electrolysis chamber is filled with electrolyte such that the electrode stack is surrounded by electrolyte , - a combustion engine combusts fuel, - a line system connects the electrolysis chamber with the combustion engine, wherein the line system also supplies a gas mixture which comprises at least a part of the hydrogen gas and oxygen gas produced by the electrolysis unit to the combustion engine , in addition to the fuel, - a gasification tank is provided with volatile organic compounds received therein, in particular methanol or ethanol, - the line system connects to the gasification tank , and the line system adds gaseous organic compounds from the gasification tank to the gas mixture that is fed to the combustion engine , - the gasification tank comprises an air inlet through which air is introduced into the gasification tank , and a compressed air unit is provided and connected with the air inlet, wherein the compressed air unit presses air into the gasification tank . - wherein hydrogen gas and oxygen gas are produced with the electrolysis unit using electrodes , wherein a plurality of anodes and cathodes are provided as electrodes , and wherein at least one electrode out of the electrodes comprises a metal plate and no carbon fibers, characterized in that - at least one other of the electrodes comprises carbon fibers formed into a sheet-like shape of carbon fibers , wherein each sheet-like shape of carbon fibers is fixed between two respective plates which jointly form the corresponding electrode , and - the anodes and cathodes are alternatingly arranged on top of each other to form an electrode stack, wherein an electrolysis chamber is filled with electrolyte such that the electrode stack is surrounded by electrolyte , - a combustion engine combusts fuel, - a line system connects the electrolysis chamber with the combustion engine, wherein the line system also supplies a gas mixture which comprises at least a part of the hydrogen gas and oxygen gas produced by the electrolysis unit to the combustion engine , in addition to the fuel, - a gasification tank is provided with volatile organic compounds received therein, in particular methanol or ethanol, - the line system connects to the gasification tank , and the line system adds gaseous organic compounds from the gasification tank to the gas mixture that is fed to the combustion engine , - the gasification tank comprises an air inlet through which air is introduced into the gasification tank , and a compressed air unit is provided and connected with the air inlet, wherein the compressed air unit presses air into the gasification tank . <EOS>