On the frequency response of a quartz supported platinum electrode: Dependence on pretreatment

Electrochemical quartz crystal microbalance measurements of CO adsorption and oxidation on Pt in various electrolytes

“…Ageing can drastically alter the frequency response according to Raudonis et al [16]. Using sputtered Pt (roughness factor 6-7) in 0.2 M H2SO4 they found a frequency decrease (mass increase) over the whole potential range of H desorption and O adsorption if the electrode is fresh and stabilized, but a frequency increase for a strongly aged electrode (more than 10,000 cycles).…”

Temperature dependence of two types of dissolution of platinum in acid media. An electrochemical nanogravimetric study

“…The underpotential deposition (upd) of hydrogen, oxygen and electrosorption of ions on platinum surface have been investigated by many researchers, in the last decades mostly to gain a deeper insight into the relationship between the surface structure and reactivity as well as the nature of the formation of double layer at the metal | electrolyte interface. The electrochemical quartz crystal nanobalance (EQCN) has become a basic tool to study these phenomena [6,7,[13][14][15][16][17][18][19][20][21]. The typical EQCN response, that in the majority of the studies on platinum electrodes has been reported, is as follows.…”

Electrochemical quartz crystal microbalance study on carbon oxides adsorption in the presence of electrosorbed hydrogen on Pd alloys with Pt and Rh

“…The frequency lowering in the hydrogen region probably results from stresses connected with hydrogen absorption [72,82]. However, it is also possible that this behavior reflects changes in hydrofilicity of the electrode surface caused by the presence of weakly adsorbed hydrogen (strongly interacting with water molecules) or a shift of the pzc value, similarly to the case of pure Pt-EQCM electrode [47,74,77,78,80]. Further frequency decrease in the hydrogen and double layer regions can be explained by the replacement of adsorbed hydrogen with water molecules and anions from the solution.…”

“…In general, the EQCM response for noble metals and their alloys under conditions of an cyclic voltammetric experiment can be affected by several factors [46][47][48][49][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82]: (a) mass changes connected with electrosorption of hydrogen (both adsorption and absorption) and oxygen (surface oxide formation), (b) mass changes connected with the electrochemical dissolution and subsequent redeposition of metals, (c) mass changes connected with specific adsorption of ions and adsorption of water molecules, (d) changes in density and viscosity of the solution layer adjacent to the electrode surface caused by non-specific adsorption of ions and changes in interactions between electrode surface and solution, (e) stresses in metal lattice during hydrogen absorption and surface oxide formation, (f) effects connected with the changes in the electrode roughness.…”