Publications by authors named "Martijn J Mekkering"
The local coordination environment of single atom catalysts (SACs) often determines their catalytic performance. To understand these metal-support interactions, we prepared Pt SACs on cerium dioxide (CeO) cubes, octahedra and rods, with well-structured exposed crystal facets. The CeO crystals were characterized by SEM, TEM, pXRD, and N sorption, confirming the shape-selective synthesis, identical bulk structure, and variations in specific surface area, respectively.
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- The study explores dual-atom catalysts (DACs) that contain pairs of metal atoms, which can enhance catalytic performance compared to single-atom catalysts (SACs) due to their additional binding possibilities.
- Using an automated setup, the researchers compared platinum SACs and DACs on ceria support in ammonia borane hydrolysis, observing significant differences in catalytic behavior and reaction rates.
- The DACs were found to be more efficient, as the presence of a second platinum atom increased reaction rates by three times and facilitated reactions at lower temperatures by reorganizing reactants at the active site.
Article Synopsis
- Single-atom catalysts like Rh/AlO perform well due to low metal loading, but face challenges with isolated atoms clumping together during preparation or high-temperature reactions.* -
- This study demonstrates that the process of dissolving and re-extracting metal atoms from the support can prevent deactivation during methane reforming at temperatures of 700-900 °C.* -
- The research reveals that as rhodium atoms move to the surface over time, the catalyst's performance improves, despite changes in the oxidation state of rhodium, emphasizing the importance of atom migration in enhancing catalyst effectiveness.*
Alkaline water electrolysis (AWE) is among the most developed technologies for green hydrogen generation. Despite the tremendous achievements in boosting the catalytic activity of the electrode, the operating current density of modern water electrolyzers is yet much lower than the emerging approaches such as the proton-exchange membrane water electrolysis (PEMWE). One of the dominant hindering factors is the high overpotentials induced by the gas bubbles.
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