Suggest two materials other than hydrogen that can be used as fuels in fuel cells.

Explanation

To answer the question regarding two materials other than hydrogen that can be used as fuels in fuel cells, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Fuel Cells**:
- Fuel cells are electrochemical devices that convert the chemical energy of a fuel directly into electrical energy through a reaction with an oxidant.
- They operate continuously as long as the reactants are supplied.

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