Electrocatalytic oxidation of CO on Pt-modified Ru(0001) electrodes

Tuning catalytic properties of bimetallic surfaces: Oxygen adsorption on pseudomorphic Pt/Ru overlayers

“…As shown experimentally, platinum overlayers deposited on a Ru(0 0 0 1) grow pseudomorphically [11,22,[24][25][26], even up to a film thickness of four layers [11]. Compared to its own lattice constant, the platinum overlayers are compressed by 2.5% to adapt to the ruthenium lattice constant.…”

Low temperature CO oxidation on Au(111) and the role of adsorbed water

“…There are also several investigations of CO and OH reactions on metal surfaces [36,37], primarily related to electrochemistry. The pioneering work of Bowker, Barteau, and Madix showed a picture of isotopic mixing of water and pre-adsorbed oxygen on a Ag(110) surface.…”

Methanol electro-oxidation and induced sintering on Pt nanoclusters supported on thin-film Al2O3/NiAl(100)

“…Both processes must occur with the Pt clusters, because the two features were not observed for measurements on pure thin-film Al 2 ments for the sample in HClO 4 (0.1 M) (curve HClO 4 ) indicate that this contribution is small. According to the current density measured earlier from Pt single crystal [10], the OH À adsorption signals were not seen possibly because the Pt coverages under studies were very low (50.17 ML) and that resulted in low signals. Similar CV profiles were observed on Pt nanoparticles electro-deposited on Ru electrodes [11].…”

“…With further scans, the characteristic feature between 0.35 and 0.7 V decreased gradually, while the signals between À0.3 and À0.2 V remained significant. The signals between 0.35 and 0.7 V are attributed primarily to methanol oxidation [2,3,11,28] and those ranging between À0.3 and À0.2 V are due to hydrogen adsorption/desorption and hydrogen oxidation/evolution [2,4,10,11]. Both processes must occur with the Pt clusters, because the two features were not observed for measurements on pure thin-film Al 2 ments for the sample in HClO 4 (0.1 M) (curve HClO 4 ) indicate that this contribution is small.…”

“…As the complicated nature of commercial catalyst hinders a comprehensive understanding of detailed mechanisms, well defined surfaces of pure metal single crystals or bulk alloys as model systems have been extensively employed [2]. Many results have been reported for electrocatalytic reactions on single crystals of Pt [2][3][4] and Ptbimetallic alloys, such as Pt-Ru [2,[5][6][7][8][9][10][11], and progress in understanding the mechanisms is made. However, these single crystals as model systems lack important features of practical electrocatalysts, including sintering of the dispersed metal nanoclusters and possibly their reactivity dependent on size.…”