Catalysis by ad-atoms

Quantitative DEMS study of ethanol oxidation: effect of surface structure and Sn surface modification

“…After the first report on the co-catalytic effect of Pb on formic acid oxidation, 21 it has been shown that also modification of the electrode surface with adatoms, such as Sn, [22][23][24][25][26][27] Ru, 28,29 Bi, 30,31 As 32,33 etc., can enhance the catalytic properties of the platinum electrode. Many authors 15,34 reported the catalytic activity of the Pt 3 Sn/C catalyst for ethanol oxidation with different techniques.…”

Investigation of Enhanced CO Tolerance in Proton Exchange Membrane Fuel Cells by Carbon Supported PtMo Alloy Catalyst

“…Alternate binary electrocatalysts containing a more oxidizable element with ability to activate oxygenated species at lower potentials and hence initiate CO oxidation on the surface with lower overpotentials have been the focus of several decades of research. Prior literature is replete with investigations on alloys such as PtSn, [1][2] PtRh, 3 PtRu, [4][5][6] and Pt with oxygen adsorbing adatoms such as Ge, Sb, and Sn [7][8] etc. In recent years PtRu alloys have received renewed attention as promising candidates for CO oxidation in PEM fuel cells.…”

Oxidação eletroquímica do metanol sobre partículas de PtRu e PtMo suportadas em carbono de alta área superficial

“…Devido a seu envenenamento, a platina sozinha não é suficientemente ativa para ser usada comercialmente na oxidação do metanol. Pode-se usar a platina combinada com óxidos metálicos como o WO 3 [43][44] e uma outra alternativa é o uso de catalisadores bifuncionais onde o segundo metal (menos nobre que a Pt) como Ru [21][22][23][24][25][26][27][28], Mo [35,45], Sn [20] fornece o oxigênio de forma ativa, facilitando a oxidação dos intermediários.…”