Hydrogen gas: Difference between revisions
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Can electrolysis be done efficiently on a medium scale, for example using the energy from a rooftop of solar panels? | Can electrolysis be done efficiently on a medium scale, for example using the energy from a rooftop of solar panels? | ||
Are rare minerals needed to make efficient electrolysis machines? If so, which minerals and how much of them; what are the different options? | Are rare minerals needed to make efficient electrolysis machines? If so, which minerals and how much of them; what are the different options?<!-- answered in [[fuel cell vehicles]] kind of already --> | ||
Can natural-gas infrastructure be retrofitted for hydrogen gas, in general? | |||
===From fossil fuels=== | ===From fossil fuels=== | ||
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Currently most hydrogen is produced from natural gas via [[wikipedia:steam reforming|steam reforming]], but this emits just as much CO2 as burning the natural gas itself. | Currently most hydrogen is produced from natural gas via [[wikipedia:steam reforming|steam reforming]], but this emits just as much CO2 as burning the natural gas itself. | ||
There's another (similar) process called [[methane cracking]] which takes in natural gas, and produces hydrogen gas + solid carbon (not CO2). | There's another (similar) process called [[methane cracking]] which takes in natural gas, and produces hydrogen gas + solid carbon (not CO2). The main problem, currently, is that it's a ''net loss'' of energy {{x|it takes more energy than you ultimately get by burning the hydrogen gas}}. In theory, it doesn't have to be. | ||
The main problem, currently, is that it's a ''net loss'' of energy {{x|it takes more energy than you ultimately get by burning the hydrogen gas}}. In theory, it doesn't have to be. | |||
{{p|Chemistry equations:<br />CH4 → C + 2 H2 (endothermic: 74.850 kJ/mol)<br />2 H2 + O2 → 2 H2O (exothermic: 285.820 kJ/mol)}} | {{p|Chemistry equations:<br />CH4 → C + 2 H2 (endothermic: 74.850 kJ/mol)<br />2 H2 + O2 → 2 H2O (exothermic: 285.820 kJ/mol)}} | ||
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* [[energy storage]] | * [[energy storage]] | ||
* home [[heating]] | * home [[heating]] | ||
* cooking (similar to natural-gas stoves) | |||
The general idea would be to use [[surplus electricity]] to generate hydrogen gas, and then use it as a fuel later. | The general idea would be to use [[surplus electricity]] to generate hydrogen gas, and then use it as a fuel later. | ||