- 2073 Shrawan
Hydrogen fuel compared with solar
What is hydrogen fuel? Describe about advantages and disadvantages of Hydrogen fuel. Also compare with solar energy.
Hydrogen fuel is hydrogen gas (H₂) used as an energy carrier to produce heat by burning or electricity in a fuel cell. It is made by electrolysis of water, steam reforming of natural gas, gasification of biomass or coal, etc. 2H₂ + O₂ → 2H₂O. Energy content is about 120 MJ/kg.
Advantages
- Clean: only water is formed on use.
- Highest energy per kg of any fuel (about 120 MJ/kg).
- Can be made from water using renewable electricity (green hydrogen) and can store surplus solar or wind power.
- Fuel cells are efficient (40–60%) and quiet.
- Usable in vehicles, industry, power and heating.
Disadvantages
- It is not a primary fuel; production needs energy, and most hydrogen today comes from fossil fuels (grey hydrogen).
- Very low volumetric energy density; storage needs high pressure, cryogenic liquefaction or metal hydrides, which is costly.
- Highly flammable and explosive; leaks and embrittlement of metals.
- Missing infrastructure; high cost of fuel cells and electrolysers; low round-trip efficiency.
Comparison with solar energy
| Point | Hydrogen | Solar energy |
|---|---|---|
| Nature | Secondary energy carrier | Primary renewable source |
| Availability | Must be produced | Directly available from the sun |
| Storage | Can be stored (in tanks) for long time | Needs batteries; not storable directly |
| Emissions | Clean at use; production may emit CO₂ | No emissions in operation |
| Cost | High (production, storage, fuel cells) | Low and falling (PV) |
| Transport use | Good for vehicles | Indirect (electric vehicles) |
| Intermittency | Not intermittent | Intermittent (day only) |
| Efficiency chain | Low (electricity -> H₂ -> electricity ~30-40%) | PV 15-22% |
They work well together: solar electricity can produce green hydrogen for storage and transport.
✓ Answer checked by Claude Opus 5.5 (high effort)
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