29 Jul 2017

TEAM FAST DEVELOPS A VDL BUS THAT RUNS ON FORMIC ACID

A group of Dutch university students from the city of Eindhoven has developed a way of storing a new alternative energy that could be cheaper to make, more practical and more sustainable than most alternative renewable fuels currently used.

"We've created the world's first bus that runs on formic acid, which is a much cheaper solution than hydrogen, yet it delivers the same environmental benefits," says Lucas van Cappellen from Team Fast, a spin-off company from Eindhoven University of Technology. Around 40 of his fellow students are endeavouring to develop emissions-free transport that will help in the global battle against climate change. Formic acid is found in nature, delivered in the stings and bites of ants and other insects - the Latin word for ant is formica. And this simple carboxylic acid (chemical formula HCOOH) is already used in textiles and leather processing, as a livestock feed preservative. But Team Fast has found a way the acid can efficiently carry the ingredients needed for hydrogen fuel cells, used to power electric vehicles. The fuel, which the team has dubbed hydrozine (not to be confused with hydrazine), is a liquid, which means you can transport it easily and refill vehicles quickly, as with conventional fuels. Hydrozine is created through a chemical reaction between water (H2O) and carbon dioxide (CO2).The difference is that it is much cleaner, since the tailpipe emissions are only CO2 and water. To prove the concept in the real world, an electric bus is set to hit the road in the Netherlands later this year, where it will shuttle between running on conventional bus routes and appearing at promotional events and industry fairs. The bus has an electric drive system, developed by bus builder VDL, that receives additional power from the formic acid fuel cell system mounted in a range-extender trailer, towed behind. "Our tank is around 300 litres, so we will extend the range of the bus by 200km (180 miles). Current hydrogen fuel cell buses have a range of up to 400 kilometer.”

The whole process works quite simple. "In a reactor, water and CO2 are bonded using sustainable electricity. This is a direct, sustainable electrochemical process," explains Mr van Cappellen.

The hydrozine is then broken down by a catalyst into hydrogen and carbon dioxide inside a piece of kit called a reformer that Team Fast is attempting to patent.

Its newly designed reformer is a tenth of the size of reformers of the past, which is why "it is now applicable in transport applications for the first time".

The hydrogen is then added to a fuel cell where it reacts with oxygen to generate the electricity that powers the electric motor.

But does it really stand a chance of becoming commercially viable? "It costs about 35,000 euros (£30,000) to convert a conventional petrol filling station to a hydrozine filling station, a process that essentially involves replacing the pipes and coating the tanks," says Mr van Cappellen. As such, it is "100 times cheaper" to roll out a fuelling network for hydrozine than for gaseous hydrogen, he maintains.

"Hydrozine is currently cheaper than petrol and more expensive than diesel in the Netherlands, and in future we expect prices to come down so it will be cheaper than both," he adds. Although the bus emits CO2, Team Fast argues that the original CO2 used to create the hydrozine is taken from existing sources, such as air or exhaust fumes, so that no additional CO2 is produced - it's a closed carbon cycle in the jargon.

"It works on a very important issue: the storing of renewable energy in a transportable form and in a form which can actually be used."



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