New Aerogel Fuel Cell Could Boasts The Efficiency of Conventional Fuel Cells By 5 Times

New Aerogel Fuel Cell Could Boasts The Efficiency of Conventional Fuel Cells By 5 Times

The cleanest energy sources available on the earth could be Fuel cells. They convert hydrogen into electricity, and their only waste byproduct is water. The biggest challenge of using them is that fuel cells require expensive rare earth metals like platinum. Now a team of international researchers at the Paul Scherrer Institute is developing a new aerogel-based fuel cell that’s five times more efficient than conventional fuel cells, and it uses a bare minimum of rare earth metals.

Typically a fuel cell works by combining oxygen with hydrogen in a chemical bonding process that creates free electrons to power the vehicle, and leaves water coming out of the tail pipe as the only waste material. As this reaction takes place very slowly under normal conditions, catalysts are needed to speed up the conversion process. In these conventional cells, the catalyst is made of a rare metal such as platinum. On top of being scarce and expensive, this catalytic material also needs to be built on top of a high surface area carbon, which is corrosive and can shorten the lifespan of the fuel cell.

An international team of researchers at PSI and Dresden University overcame these obstacles by replacing the carbon with a three dimensional aerogel block made of a platinum palladium alloy. The scientists discovered that the new material increased the efficiency of a regular fuel cell by five times. This means that the same amount of oxygen can now be converted with only a fifth of the amount of precious metals. This opens up the possibility of creating a new fuel cell using just one-fifth of the the necessary platinum – reducing the costs and environmental impact of the fuel cell.

Schematic representation of the oxygen reduction reaction at the positive electrode (aerogel material). Each oxygen atom from the oxygen molecules fed into the cell captures two electrons, which is followed by the reaction with hydrogen nuclei to form water.

The scientists theorize that the aerogel material works so well because of it’s own inherent qualities as a nano-structured foam. So far, the aerogel material has proven itself and even passed long-term tests in the lab simulating the conditions of an operating vehicle. The scientists meanwhile want to take a closer study at their aerogel block, particularly to investigate the stability that might come with a bimetal material, in a three year study they currently are drafting and proposing for funding now.

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Write by: RC - Thursday, August 15, 2013