Formic acid fuel cell carries hydrogen over infrastructure obstacles
Hydrogen fuel cells have long been floated as a potential platform for zero-emission vehicles, but problems with efficiency and storage have put up some roadblocks. Rather than using hydrogen in its normal gaseous state, a liquid hydrogen carrier called formic acid has been proposed, and now researchers from GRT Group and EPFL have built a prototype of a formic acid-based fuel cell.
The uptake for hydrogen fuel cells, both in vehicles and larger industrial uses, has been slow. It's difficult to set up the infrastructure to store and transport the gas, since it needs to be stored under high pressure and can't use the same piping as natural gas. Its fairly low energy density doesn't help, either.
Formic acid could be a more practical solution. It's the simplest combination of hydrogen and carbon dioxide and exists as a liquid under normal conditions, meaning it could slot into existing infrastructure more readily than hydrogen gas. Plus, because it's already widely used in agriculture and industry, the production infrastructure is already in place, and it could soon be made from CO2 using solar power.
Not only does formic acid make hydrogen easier to store and transport, it's a very efficient hydrogen carrier, with 1 L (0.3 gal) of formic acid carrying 590 L (156 gal) of hydrogen. That means hydrogen could be stored in a liquid form, pumped into a device to extract it as a gas, and then fed into a conventional hydrogen fuel cell. Last year, TU Eindhoven students developed just such a system that could be towed behind a bus, feeding hydrogen into its fuel cell to extend the vehicle's range.
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