Investigation of the CO oxidation rate oscillations using electrochemical promotion of catalysis over sputtered-Pt films interfaced with YSZ

Metal-Support Interaction of Pt Nanoparticles with Ionically and Non-Ionically Conductive Supports for CO Oxidation

“…The promoting effect of O 2− for CO oxidation over Pt/YSZ film-catalyst was already demonstrated in the classical EPOC system, i.e., under applied polarization. 21,22 In the present case, similar backspillover mechanism of O 2− is presumed to occur in self-induced EPOC configuration without the application of an external current or potential. The driving force of O 2− backspillover is a difference in the work functions of YSZ and Pt nanoparticles, this interaction would plausibly increase as nanoparticles become smaller and diffusion distances for O 2− shorten.…”

Electrochemical Oscillation in Li-Ion Batteries

“…For instance, the periodic formation and dissolution of passivating surface layers would cause oscillations in electrocatalytic systems. 56,57 By contrast, the aforementioned electrochemical oscillation of the m-LTO electrode is essentially a self-reorganization of multi-particle phase-separating dynamics, representing a reaction pathway that is closer to the thermodynamic equilibrium. Although we here focus mainly on the galvanostatic voltage oscillation, the potentiostatic current oscillation, as another side of the same coin, has also been confirmed (Section S10 in Supplemental Information).…”

Electrochemical Oscillation during the Galvanostatic Charging of Li4Ti5O12 in Li-Ion Batteries

“…28 For the CO oxidation, there are two different oxygen species on the Pt surface: the reactive chemisorbed oxygen and the strongly adsorbed PtO x ; the PtO x prefers to form at a high O 2 /CO ratio, which blocks the active sites, and it can be slowly reduced by CO, which leads to the bistable regime and oscillatory behavior of CO oxidation. 29 In a heterogeneous catalytic system, local oscillators can be coupled via surface diffusion, diffusion through the gas phase and heat transfer, and the lack of synchronization may give rise to a complicated time series of the global reaction. 30 In the process of Cu electrodeposition, the electrochemical oscillation can be observed in the presence of SCN − .…”

“…In the late 1960s, the establishment of Prigogine’s dissipative structure theory laid the foundation for the (electro)­chemical oscillation phenomenon, which has been widely investigated in some electrochemical reactions, such as electrocatalysis and electrodeposition. On the Pt or Pt alloy electrodes, the electrochemical oscillations were often observed in the electrocatalytic oxidation of some small molecules, such as formic acid, glycerol, methanol, , H 2 , and CO. − Generally speaking, the electrocatalytic oscillation is caused by the self-organized change in the coverage of different adsorbates on the electrode surface . Based on Monte Carlo simulations, it can be divided into three essentially different types: kinetic oscillations, fluctuation-induced transitions, and fluctuation-induced oscillations .…”