Composite Catalysts

Catalysts called composites have a thin coating of the catalytically active metal phase on the support surface. The distribution of metal found on these supports resembles an egg-shell-like shape. For reactions that are heat- or mass-transfer-resistant, this distribution is ideal. In order to create the nanocomposite, several metals, such as gold, platinum, and osmium, were deposited atop silver sulphide nanocrystals (pictured). It is feasible to tailor the final composite's catalytic characteristics by successively depositing different metals onto the nanocrystal surface. their platinum-containing nanocomposites' catalytic effectiveness in an electrochemical device called a methanol fuel cell, which converts methanol into power. A methanol oxidation reaction (MOR) converts methanol catalytically into carbon dioxide at the anode side of the fuel cell, releasing hydrogen and electrons in the process. Before recombining with the hydrogen and oxygen in an oxygen reduction process (ORR) at the cathode and creating water as a byproduct, the electrons circulate through an electrical circuit. The exceptional catalytic efficiency of the anodes is a result of both the increased electronic characteristics of the nanocomposite itself and the high surface area of the platinum deposits on the nanocrystals, which offers a bigger electrochemically active surface for the MOR. As a result, carbon monoxide, a MOR intermediate, won't adhere to the platinum and poison the catalyst.