• This electrolytic cell enables the performance investigation of gas diffusion electrodes under photoelectrocatalysis conditions. • The cathode of the cell adopts gas diffusion electrodes, such as carbon cloth, carbon paper and other waterproof and gas-permeable materials. • Platinum wire counter electrode is equipped for the cathode (standard accessory: 0.5×230 mm platinum wire). • Silver chloride electrode is supplied as the standard reference electrode. • The cathode gas inlet adopts serpentine flow channels for sufficient reaction between reactant gas and catalysts. If humidified gas is required, it is recommended to be matched with the special gas humidifier from Gaoss Union.