[Ocean Hydrogen Energy] How many kilowatt-hours of electricity is needed to electrolyze 1 kilogram of hydrogen?
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I saw some netizens saying that it requires at least 83 kilowatt-hours of electricity, and some said that domestic alkaline electrolyzers have the same level as foreign countries! 55-58kw produces 1kg of compressed hydrogen
Let’s talk about how much water to use first. Suppose the mass of water required is x H2O~~~~~~~~~~~H2 18 2 500 mol of hydrogen requires 1000 mol of electrons. According to Faraday's constant F=96485C/mol, that is, the charge carried by 1 mol of electrons is 96485C. Then the charge carried by 1000 mol of electrons is 96485000C, that is, the required charge is 96485000C. Then you can know that the current can calculate time according to Q=It. Of course, these are only theoretical. In fact, the efficiency is definitely lower than 100%, and the actual value is greater than the theoretical value. Saw it online
Can you tell me how much temperature is needed?
That's what the first floor said about improvement.
These are all theoretical values, I don’t know the actual situation.
The theoretical amount of electricity can be calculated based on Faraday's law of electrolysis, and then the actual amount of electricity can be calculated based on the current efficiency.
According to the national standard, the first-level energy consumption of a large electrolysis water hydrogen production device (output greater than 60 standard cubic meters/hour) cannot be higher than 4.3KW/square hydrogen. Calculated, one kilogram of hydrogen requires 48.16KW of electricity. This does not include the power consumption of water treatment and hydrogen compression.
The level of electrolytic hydrogen production in our country is basically at the international level. But with this power consumption, it is not cost-effective to produce hydrogen through electrolysis and then use it as energy power? ? ?
At present, the actual electricity consumption per unit is about 5 kilowatt hours. 1kg is about 55 kWh