Three discoveries for cleaner and cheaper fuel

Published on August 24, 2016
Three discoveries for cleaner and cheaper fuel

How can rare and expensive materials be used more efficiently to produce cleaner and cheaper fuel? Under the guidance of Marc Koper, Professor of Catalysis and Surface Chemistry, international teams of scientists have published 3 articles in Nature Communications.

CO2 neutral future

Professor Marc Koper is researching the foundation for a CO2-neutral future. Working closely with his colleagues, he is looking for ways to make electrochemical reactions as efficient as possible. They believe that the most efficient way to store renewable electricity from solar and wind energy is in hydrogen using electrolysis, and then subsequently delivering that stored energy using a fuel cell. Using this method, catalysis and electrochemistry can play a major role in the provision of energy.

Rare and expensive materials

The materials (catalysts) that are crucial for enabling the electrochemical reactions most efficiently are usually rare and expensive materials, such as platinum and iridium. Recent studies have focused on replacing these expensive materials with cheaper alternatives, or on using them more efficiently. The top three findings from Professor Koper’s research group target the more efficient use of platinum and iridium.

1: New material

The researchers discovered a new material called ‘iridium double perovskite’. This new material can be used for electrolysis, because it has a lower iridium content than the conventional material, but higher catalytic activity. This would eventually make the conversion of electricity into fuel a cheaper process.

Article: Iridium-based Double Perovskites for Efficient Water Oxidation in Acid Media, Oscar Diaz-Morales, Stefan Raaijman, Ruud Kortlever, Patricia J. Kooyman, Tim Wezendonk, Jorge Gascon, W. T. Fu,  Marc T. M. Koper

2: New technique

Platinum is widely used in fuel and electrolytic cells. Knowledge of how precisely platinum oxidises can help make the catalytic process cleaner and cheaper. Using a new spectroscopic technique called Shell Isolated Nanoparticle-Enhanced Raman Spectroscopy (SHINERS), researchers can see exactly how platinum oxidises at the atomic scale. This process has been shown to be very sensitive to the surface structure of platinum.

Article: Intermediate stages of electrochemical oxidation of single-crystalline platinum revealed by in situ Raman spectroscopy, Yi-Fan Huang, Patricia J. Kooyman, Marc T. M. Koper

3: Unexpected behaviour

At electrode potentials, where platinum should be stabilized by cathodic protection, it proves to be surprisingly unstable. It is etched very precisely according to a very regular process. The researchers demonstrated that this takes place under conditions very similar to the conditions under which platinum catalyses hydrogen production.  An improved understanding of this unexpected process can extend the life of electrochemical cells.

Article: Anisotropic etching of platinum electrodes at the onset of cathodic corrosion

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