# Fuel Cells

Part of the Energy Merit Badge Digital Resource Guide: [Introduction & Overview](https://merit-badge.university/merit-badges/energy/guide/index.md)

> **7d.** In your explanation, describe the technology, cost, environmental impacts, and safety concerns. Fuel cells.

Fuel cells make electricity through an electrochemical reaction instead of by burning fuel to make heat first. Hydrogen fuel cells are the best-known example. They combine hydrogen and oxygen to produce electricity, water, and heat.

### Technology improvements

Engineers work to improve catalysts, membranes, durability, startup times, and cost. A key goal is getting more electricity from the same amount of fuel while making fuel cells last longer. Better storage and delivery of hydrogen also matter.

### Cost

Fuel cells can be expensive because of specialized materials, fuel handling, and manufacturing costs. The cost of producing and transporting hydrogen can also be a major factor. That is one reason fuel cells are promising in some applications but not everywhere.

### Environmental impacts

At the point of use, hydrogen fuel cells can be very clean because they mainly produce water. But the bigger environmental question is how the hydrogen was made. If it came from fossil fuels without carbon controls, the overall impact is different than if it came from low-carbon electricity.

### Safety concerns

Hydrogen is highly flammable and must be stored and handled carefully. Pressurized systems, fuel leaks, and electrical hazards are important safety issues.

> **Tip**
>
> When discussing fuel cells, separate the **fuel cell device** from the **hydrogen supply chain**. The device may be very clean at use, but the bigger picture depends on where the fuel came from.

[U.S. Department of Energy — Hydrogen and Fuel Cell Technologies Office](https://www.energy.gov/eere/fuelcells/hydrogen-and-fuel-cell-technologies-office): DOE overview of fuel cells, hydrogen systems, current uses, and technology challenges.

You have looked at a system that skips ordinary combustion. Next, move underground and see how engineers try to use the Earth’s own heat as a power source.

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