Researchers seek to improve efficiency of hydrogen fuel cells

According to a statement, the majority of hydrogen fuel cells use catalysts made of platinum, which is rare and expensive. There are few alternatives because most elements can’t endure the fuel cell’s highly acidic solvents present in the reaction that converts hydrogen’s chemical energy into electrical power.

Platinum and iridium can resist the corrosive process but they are impractical for large-scale use due to their scarcity and cost.

Gold and palladium can similarly cope in the corrosive environment of a fuel cell but are not suitable with the chemical reaction — a situation that UCF’s Prof Sergey Stolbov and postdoctoral research associate Marisol Alcántara Ortigoza sought to rectify.

They did so by creating a sandwich-like structure that layers cheaper and more abundant elements with gold and palladium and other elements to make it more effective.

The outer monoatomic layer is either palladium or gold. Below it is a layer that works to enhance the energy conversion rate but also acts to protect the catalyst from the acidic environment. These two layers reside on the bottom slice of the sandwich — an inexpensive substrate (tungsten), which also plays a role in the stability of the catalyst.