PROBLEM TO BE SOLVED: To generate a hydrogen peroxide in good condition while improving safety.
SOLUTION: An electrolysis unit 1 comprises: an electrochemical element 10 that is configured with a first electrode part 12 and a second electrode part 13 that are made of electrode catalysts, being arranged on both surfaces of a film 11a made of an ion conductive electrolyte; and a DC power supply 20 that applies a DC voltage to both electrodes in a manner that the first electrode part 12 is the anode and the second electrode part 13 is the cathode of the electrochemical element 10. The electrode catalyst comprising the anode (the first electrode part 12) is formed with a catalyst that has an electrolysis activity of water. The electrode catalyst comprising the cathode (the second electrode part 13) is formed with a catalyst that has a two-electron reduction activity of oxygen. The electrochemical element 10 is arranged so that the surface of the anode faces an atmosphere with a higher relative humidity than the surface of the cathode does.
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