Are Hydrogen Fuel Cell Vehicles Safe?

Craig Cole
by Craig Cole

Hyundai’s latest hydrogen-powered vehicle is the NEXO, a versatile crossover that runs on nature’s lightest element and emits only water. It may be squeaky clean, but in reality, how safe is this gaseous fuel?

The idea of crashing a vehicle like this brings to mind visions of the Hindenburg, Nazi Germany’s rigid airship that crumpled to the ground in a pall of flames back in 1936. Despite this tragedy and public-relations black eye for hydrogen, it may actually be a safer vehicle fuel than gasoline.

For starters, the NEXO’s trio of storage tanks, which in total hold 41.4 gallons (156.6 liters) of hydrogen at more than 10,000 PSI (700 bar), are heavily reinforced to prevent puncture. Beyond that, they’re built to hold far more pressure than that. Mike O’Brien, vice president of product, corporate and digital planning at Hyundai said, “That tank will sustain, I think it’s over 12,000 PSI (827 bar),” which gives it a large margin of safety.

Still not convinced that hydrogen fuel cell cars are safe? Well, fear not, because O’Brien isn’t done. “There’s been a number of manufacturers that demonstrate the robustness of their tanks. They’ve used armor-piercing, military-grade performance rounds,” he said. “Toyota did that, frankly, and I think you can go on YouTube and see that video.” He added that Hyundai engineers have conducted similar destructive tests on their hydrogen-storage systems to prove their robustness.

SEE ALSO: 2019 Hyundai NEXO Review

But perhaps the biggest advantage hydrogen has over liquid fuels is its ephemeral nature. “What you need to keep in mind,” explained O’Brien, “Is unlike gasoline, which puddles on the ground and remains a hazard, for hours, and hours, and hours, in the case of hydrogen, it dissipates in a fraction of a second. It’s gone.”

What if electricity became the dominant form of motor-vehicle propulsion a century or so ago? Compared to internal combustion, it’s cleaner, provides instant torque and mechanically is far simpler. Imagine trying to sell motorists on the benefits of driving around with gallons and gallons of a highly flammable and potentially explosive liquid sloshing around in a tank under their feet. “There’d be all these hazards we’d be concerned with,” said O’Brien. “We just learned how to manage them and manage them in a safe way over years of experience and handling.” There’s no reason to think hydrogen would be any different, despite what you may have seen on the newsreels.

Discuss this article on our Hyundai NEXO Forum

Craig Cole
Craig Cole

Born and raised in metro Detroit, Craig was steeped in mechanics from childhood. He feels as much at home with a wrench or welding gun in his hand as he does behind the wheel or in front of a camera. Putting his Bachelor's Degree in Journalism to good use, he's always pumping out videos, reviews, and features for When the workday is over, he can be found out driving his fully restored 1936 Ford V8 sedan. Craig has covered the automotive industry full time for more than 10 years and is a member of the Automotive Press Association (APA) and Midwest Automotive Media Association (MAMA).

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  • Charles Charles on Oct 22, 2018

    When I look into my crystal ball, I see plug in hybrids and pure battery electric cars. I don't see many H2 fuel cell powered cars. What my crystal ball is very hazy about is what will power the range extenders in plug in hybrids. ICE for now, but H2 fuel cells could be used in the future.