Question

Many scientists endeavor to find new technology which will create clean fuels. _______________ cell usage promises a pollution-free alternative to using fossil fuels. The cells make water by combining hydrogen and oxygen, which generates electricity.

Answer 1

From this statement I would assume it is talking about Hydrogen Fuel cells

Answer 2

Answer: Hydrogen fuel cell

Hydrogen is a clean fuel. When hydrogen is consumed in a fuel cell, produces water, electricity and heat. Hydrogen and fuel cells can provide energy for use in diverse applications, including distributed or combined-heat-and-power; backup power, systems for storing and enabling renewable energy, additional power help for trucks, aircraft, rail, and ships; specialty vehicles, passenger and freight vehicles including cars, trucks, and buses.