Why hydrogen fuel cells are the future

How do hydrogen fuel cells work? And could they be the future for cars?

Electric vehicles (EVs) have been hogging the headlines for years now, and rightfully so. But there's another zero-emission technology to power cars that's been quietly waiting in the pit lane: Hydrogen fuel cells.

You're probably already familiar with battery electric vehicles (BEVs). 

Well, hydrogen cars work quite differently. They generate their own electricity and emit nothing but water vapour.

They're not here to replace EVs, don't get us wrong. But they do offer a compelling alternative for drivers who want zero-emission driving (especially ahead of the 2030 ban), and come with their own set of advantages.

But are hydrogen fuel cells really the future? Let's find out.

What are hydrogen fuel cell cars?

Hydrogen fuel cell cars (or Fuel Cell Electric Vehicles (FCEVs) as they're officially known) are essentially electric cars with a twist.

Instead of drawing power from a large battery that needs plugging in and charging, they generate their own electricity on board using hydrogen.

The fuel cell combines hydrogen stored in high-pressure tanks with oxygen from the air to produce electricity, which then powers an electric motor — just like a regular EV.

The only thing coming out of the exhaust? Pure water vapour.

It's worth noting that FCEVs aren't the only type of hydrogen-powered car though.

There are also hydrogen combustion vehicles, which burn hydrogen in a modified combustion engine rather than using a fuel cell. These are mainly used in motorsport and prototype vehicles at the moment — so when we talk about hydrogen cars, we're talking about FCEVs.

How do hydrogen cars actually work?

The process is efficient, simple, and cleaner than anything you'll find under the bonnet of a petrol or diesel car.

Bear with us on the science — it’s actually quite simple and only takes a few steps:

• Hydrogen is stored in high-pressure tanks onboard the vehicle
• When you drive, the fuel cell combines that hydrogen with oxygen drawn from the air
• This triggers an electrochemical reaction — hydrogen molecules are split into protons and electrons at the anode
• The electrons are forced through a circuit, generating an electric current that powers the motor
• The protons pass through a membrane to meet the electrons at the other side, where they combine with oxygen to produce the only by-product: water.

Think of it like a battery that never needs charging. As long as hydrogen is being supplied, electricity is being generated.

The electricity takes one of two routes: straight to the motor to drive the wheels, or into a small buffer battery for later use. This buffer battery is significantly smaller and lighter than the one you'd find in a traditional BEV, because the fuel cell is constantly topping it up.

Hydrogen cars can also recover energy under braking, feeding it back into the battery system through regenerative braking, just like other electric vehicles.

But instead of plugging in to charge, you simply refuel it like you would a combustion engine.

What are the advantages and disadvantages of hydrogen fuel cells?

The biggest advantages of hydrogen cars

Rapid refuelling is where hydrogen cars really shine, particularly for drivers who've hesitated over electric due to charging times or range concerns.

While even a rapid charger can leave you waiting 30 minutes or more, hydrogen cars refuel in around three to five minutes — about the same as filling up at a petrol station. For high-mileage drivers, that's a significant practical advantage.

Range is impressive too.

Most hydrogen cars can cover 300 to 400 miles on a single tank, putting them on par with petrol cars and comfortably ahead of many BEVs. The Toyota Mirai, for example, offers a WLTP Comb range of up to 400 miles.

There's an efficiency story here as well.

Hydrogen fuel cells convert around 60% of their fuel's energy into power, compared to roughly 25% for a traditional combustion engine.

That efficiency advantage, combined with zero harmful tailpipe emissions and a full range that doesn't drop in cold weather, makes a compelling case.

To summarise, the biggest advantages of hydrogen cars are:

• Rapid refuelling — around three to five minutes
• Range of 300–400 miles on a single tank
• Zero harmful tailpipe emissions
• Consistent range regardless of weather conditions
• Higher energy efficiency than combustion engines

The current challenges

Hydrogen cars have a lot going for them, but it would be doing you a disservice not to be upfront about the challenges. 

And right now, there are a few significant ones.

Infrastructure is the biggest barrier by some distance. There are currently just six hydrogen refuelling stations open to the public in the UK — and that number has actually fallen in recent years.

Compare that to the tens of thousands of EV charge points now available nationwide, and the gap is stark.

Cost is another significant hurdle. The two mainstream hydrogen cars currently available in the UK — the Toyota Mirai and the Hyundai Nexo — both sit well above £60,000.

High production costs, low manufacturing volumes, and the use of platinum in the fuel cell stack all contribute to that premium price.

Then there's the question of how hydrogen is actually produced. 

Not all hydrogen is created equal, and the environmental credentials of a hydrogen car depend largely on how it's made.

Currently, the majority is produced from natural gas, releasing significant carbon emissions in the process. Green hydrogen — produced using renewable energy — is the cleaner alternative, but it remains more expensive and less widely available.

Storage and transportation present challenges too. As a gas, hydrogen must be heavily compressed and stored in high-pressure tanks.

Transporting it at scale would require either a new pipeline network or significant retrofitting of existing gas infrastructure, neither of which is exactly cheap or quick.

Some manufacturers are also having second thoughts about hydrogen cars as a whole.

Stellantis recently axed its Hydrogen Pro One fuel cell van project just months before its planned European launch. 

Their reasoning? 

Questionable demand and a lack of infrastructure.

To summarise, the current challenges facing hydrogen cars are:

• Only six public hydrogen refuelling stations currently open in the UK
• High purchase costs — currently £60,000+
• Most hydrogen is still produced from fossil fuels
• Storage and transportation infrastructure needs significant investment
• Some manufacturers are scaling back investment

What does the future hold?

The future of hydrogen cars is, honestly, a mixed bag.

On one hand, the technology addresses some of the most common barriers to zero-emission driving.

Refuelling in three to five minutes removes the charging time concern that puts many drivers off electric. Plus, with the 2030 ban on new petrol and diesel sales on the horizon, having more than one zero-emission option available can only be a good thing.

The industry's prevailing view is that hydrogen and electric aren't rivals — they're complementary.

Battery electric cars suit most everyday drivers. Hydrogen could prove more practical for high-mileage drivers who need to cover long distances quickly and can't afford to wait for a charge.

On the other hand, the infrastructure simply isn't there yet.

With just six public hydrogen refuelling stations currently open in the UK (a number that has fallen in recent years) most drivers would have to travel significant distances just to refuel.

At that point, the efficiency gains start to unravel. If you're burning time and fuel getting to a refuelling station, the practical appeal of hydrogen diminishes quickly.

And without infrastructure, demand stalls.

Without demand, investment in infrastructure slows.

It's a chicken-and-egg problem that the industry hasn't yet cracked.

Brands like BMW, Toyota and Hyundai continue to invest in hydrogen technology, and confidence in its long-term potential remains. 

But for now, meaningful mainstream adoption in the UK feels some way off.

So, are hydrogen fuel cells the way forward?

The honest answer is: potentially — but not yet, and not for everyone.

The technology is genuinely impressive.

Fast refuelling, strong range, zero harmful tailpipe emissions, and solid efficiency credentials make a compelling case on paper. And as green hydrogen becomes cheaper and more widely available, the environmental argument only gets stronger.

But for UK drivers right now, the practical reality is harder to ignore.

Just two cars on the market, both above £60,000, and only six public refuelling stations nationwide. Until that changes, hydrogen remains a fascinating glimpse of what clean motoring could look like, rather than something most of us can realistically consider.

What's clear is that hydrogen isn't going away.

It has a role to play in the transition to zero-emission transport — particularly for heavier vehicles and high-mileage drivers.

Whether that role ever extends to mainstream car ownership depends on investment, infrastructure, and time.

In the meantime, if zero-emission driving is on your radar ahead of the 2030 ban, electric cars offer the most accessible route in right now.

FAQs on hydrogen fuel cells

Are hydrogen cars safe?

It's a fair question — driving around with high-pressure hydrogen tanks onboard understandably gives some people pause.

But extensive crash testing has shown hydrogen vehicles to be extremely safe.

The tanks are incredibly robust, designed to withstand severe impacts without leaking, and hydrogen itself dissipates rapidly into the air if released, which significantly reduces any risk.

It's also worth remembering that hydrogen technology isn't new.

It's been used safely in industrial applications for decades, and the US National Fire Protection Association determined that hydrogen fuel cell vehicles are no more dangerous than conventional petrol or diesel cars.

Can you buy a hydrogen car in the UK right now?

There are currently two mainstream hydrogen cars available in the UK — the Toyota Mirai and the Hyundai Nexo.

Both are impressive pieces of technology, but both sit well above £60,000, and you'll need to plan your journeys carefully around the small number of hydrogen refuelling stations currently operating in the UK.

For most drivers, that makes hydrogen a difficult practical choice right now.

How do hydrogen fuel cell vehicles work?

In simple terms, hydrogen stored in onboard tanks combines with oxygen from the air inside a fuel cell, triggering a chemical reaction that generates electricity.

That electricity powers the motor — and the only by-product is water vapour. There's no combustion, no harmful emissions, and no need to plug in.

How much does a hydrogen fuel cell car cost?

The two hydrogen cars currently on sale in the UK — the Toyota Mirai and Hyundai Nexo — both cost well in excess of £60,000.

High production costs, low manufacturing volumes, and the use of platinum in the fuel cell stack all contribute to that price tag.

Costs are expected to fall as the technology develops and production scales up, but significant price reductions are still some way off.