NOVELTY - The method for producing hydrogen from a gaseous mixture comprising hydrogen (H2), water (H2O) and carbon monoxide (CO) at a temperature of greater than or equal to 150 degrees C, comprises: passing the gaseous mixture into a purification unit (2) comprising a membrane electrode assembly (MEA) carrying out the electro-oxidation of H2 and CO and the generation of H2; passing the obtained gaseous mixture containing H2 into a cooling unit (3); and passing the obtained gaseous mixture containing H2 into a compressor (4) comprising the MEA carrying out the electro-oxidation and the generation of pressurized H2.    USE - The method is useful for producing hydrogen from a gaseous mixture comprising H2, H2O and CO (claimed).    ADVANTAGE - The method is capable of producing the hydrogen with high purity in an energy efficient manner, and allowing maximum utilization of the gas reducing agents present in the gas mixture to be purified and ensuring better water management to prevent flooding.    DETAILED DESCRIPTION - The method for producing hydrogen from a gaseous mixture comprising hydrogen (H2), water (H2O) and carbon monoxide (CO) at a temperature of greater than or equal to 150 degrees C, comprises: passing the gaseous mixture into a purification unit (2) comprising a membrane electrode assembly (MEA) carrying out the electro-oxidation of H2 and CO and the generation of H2; passing the obtained gaseous mixture containing H2 into a cooling unit (3); and passing the obtained gaseous mixture containing H2 into a compressor (4) comprising the MEA carrying out the electro-oxidation and the generation of pressurized H2. A gas retentate of the purification unit is reintroduced into the gaseous mixture containing H2 before it is introduced into the compressor and before it moves into the cooling unit. The gas retentate contains H2O used for humidification of the gas mixture containing H2 before it is introduced into the compressor and before it moves into the cooling unit. The gaseous mixture is obtained by steam reforming of natural gas and further comprises methane (CH4) and carbon dioxide (CO2). A potential level applied to the purification unit is sufficiently high so that that the current flowing through the MEA is limited by intake gas. The gas retentate is subjected to a step of removing CO before it is reintroduced into the compressor. The step of passing the gaseous mixture into the cooling unit is carried out at a temperature of above 100 degrees C or a temperature of below 100 degrees C. An INDEPENDENT CLAIM is included for a hydrogen producing apparatus.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a hydrogen producing apparatus (Drawing includes non-English language text).    Catalytic reformer (1)    Purification unit (2)    Cooling unit (3)    Compressor (4)    Anode outlet. (4b)