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  • We all live in a modern world—a world full of technologies that looked completely futuristic

  • just a generation ago. Those modern, futuristic devices that help get us through the day all

  • use energy, and to supply all of that energy, we need fuel.

  • Today, the technology around generating clean renewable energy is evolving about as fast

  • as the rest of our modern world. And among the most versatile examples is in fuel cell

  • technology. Fuel cells provide critical energy backup

  • for many large facilities, and they provide primary energy for some remote locations.

  • Fuel cells are even being used to power vehicles and homes.

  • How does it work? A fuel cell is sort of like a battery. It

  • generates electricity from the simple and abundant hydrogen and oxygen found in chemical

  • compounds all around us. And here's the cool thing: a hydrogen fuel cell's exhaust is nothing

  • but water. There are several different types of fuel

  • cell technologies. All are designed for specific applications, but essentially they all work

  • on the same principles. Have a look at this. Hydrogen gas is fed into

  • one side of the fuel cell, and air, which contains oxygen, is fed into the other. Hydrogen

  • passes through the layers of the fuel cell, and as this happens, it induces a positive

  • and a negative charge, which generates an electrical current. Finally, the hydrogen

  • is combined with the oxygen and reacts to form H2O, better known as water.

  • Individual fuel cells can be stacked to provide more power. The taller the stack, the more

  • power it generates. Because of this stackability, fuel cells can be manufactured to scale for

  • a variety of power needs. One important thing to keep in mind about

  • hydrogen: it's not an energy source itselfhydrogen is what's called an energy carrier. That means

  • energy from another source can be used to generate hydrogen. Hydrogen then stores the

  • energy from that original source until it's used to power a fuel cell.

  • One common way to extract hydrogen is through a process called splitting water, where hydrogen

  • is separated from oxygen using an electrical current.

  • Hydrogen can also be extracted from natural gas in a process called reforming.

  • Although each of these methods requires some energy themselves, once extracted, hydrogen

  • can generate electricity without any combustionin other words, a clean energy source.

  • One of the things that fuel cells are used for today is as backup power sources for industrial

  • applications, like factories and universities. If the power grid should go down, then these

  • fuel cells can be powered up to produce electricity with no harmful emissions.

  • Today, hydrogen fuel cell test vehicles are already on the road. A local fueling station

  • like this one contains hydrogen that then can be used by a fuel-cell-powered vehicle

  • to run an electric motor. The result is an electric car with no emissions except water.

  • In the future, we could see fuel cells powering even more homes, offices, industries, and

  • vehicles, supplied by a reliable hydrogen infrastructure and supporting our nation's

  • clean energy economy. Fuel cell technology: a long-term, sustainable

  • solution to help meet the world's need for clean and reliable energy.

We all live in a modern world—a world full of technologies that looked completely futuristic


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B1 中級 美國腔

能源101。燃料電池技術 (Energy 101: Fuel Cell Technology)

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    songwen8778 發佈於 2021 年 01 月 14 日