Electrochemical promotion of CO combustion over Pt/YSZ under high vacuum conditions

Application of a cw quantum cascade laser CO2 analyser to catalytic oxidation reaction monitoring

“…Moreover, the reaction rates measured in this study (i.e. 0.1-3 mmol s -1 m -2 ) are of the same order of magnitude as similar studies on a low surface area Pt catalyst performed under UHV conditions (where the reactants were introduced in the UHV chamber with the appropriate high vacuum leak valves) [17].…”

Cluster Size Controls Branching between Water and Hydrogen Peroxide Production in Electrochemical Oxygen Reduction at Ptn/ITO

“…The falloff in mass activity for smaller particles was attributed to changes in the availability of the most active terrace sites with decreasing particle size. To address size effects directly, particularly in the subnanometer size range, a number of groups have developed experiments allowing electrochemical studies of electrodes prepared by deposition of mass-selected clusters. − Three groups have reported size-selected studies of aqueous ORR. These have disagreed on the question of whether mass activity falls off at small sizes or not. ,, Another approach to controlling size in electrocatalysts is to form metal particles using dendrimers to titrate the number of metal atoms, as pioneered by Crooks and co-workers .…”

Reprint of “Mass-selected supported cluster catalysts: Size effects on CO oxidation activity, electronic structure, and thermal stability of Pd /alumina (n≤ 30) model catalysts”

“…Catalysts are important in 35% of the world GDP [1], thus, it is not surprising that there is extensive fundamental and applied research aimed at improving catalytic activity and selectively [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Typical supported catalysts are quite complex and difficult to characterize in detail, and an important research thrust uses model catalysts to simplify the problem and allow important properties to be varied and measured in detail, to extract mechanistic insight.…”

“…Typical supported catalysts are quite complex and difficult to characterize in detail, and an important research thrust uses model catalysts to simplify the problem and allow important properties to be varied and measured in detail, to extract mechanistic insight. Among other approaches to tuning catalyst properties, using bi-or tri-metallic combinations [7,[19][20][21][22], or varying the size of the catalytic metal particles are common [2,[23][24][25][26][27][28]. Understanding the effects of particle size is complicated by the fact that there is typically a broad distribution of sizes present, and it is generally not possible to vary size independently, without also changing other properties such as metal loading or support structure.…”

“…In collaboration with Arenz, this group has also reported studies of electrocatalytic activity of supported Pt clusters [67][68][69][70][71]. Harbich and co-workers have carried out STM and reactivity studies of deposited clusters, and recently reported studies focusing on the fundamentals of CO oxidation over Pt n /TiO 2 [72,73], and of electrocatalysis, using an approach where Pt clusters are deposited directly on a solid electrolyte, allowing electrochemistry to be studied in vacuo [7,74]. The Vajda group has an active program where size-selected catalysts are studied in a variety of reactors, recently focusing on in operando studies using tools such as X-ray scattering, to probe chemistry under realistic reaction conditions [4,9,10,[75][76][77][78][79][80][81][82][83].…”