Mechanism and Simulation of Electrochemical Current Oscillations Observed in the H2O2-Reduction Reaction on Platinum Electrodes in Acidic Solutions

1999 ◽  
Vol 72 (6) ◽  
pp. 1247-1254 ◽  
Author(s):  
Yoshiharu Mukouyama ◽  
Hayato Hommura ◽  
Shuji Nakanishi ◽  
Takashi Nishimura ◽  
Hidemitsu Konishi ◽  
...  
Keyword(s):  
Reduction Reaction ◽  
Platinum Electrodes ◽  
Acidic Solutions ◽  
H2o2 Reduction ◽  
Current Oscillations ◽  
Electrochemical Current

scholarly journals Effect of hydrophobic cations on the oxygen reduction reaction on single‒crystal platinum electrodes

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Tomoaki Kumeda ◽  
Hiroo Tajiri ◽  
Osami Sakata ◽  
Nagahiro Hoshi ◽  
Masashi Nakamura
Keyword(s):  
Oxygen Reduction Reaction ◽  
Single Crystal ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Platinum Electrodes

Fe–N-doped graphene as a superior catalyst for H2O2 reduction reaction in neutral solution

2015 ◽  
Vol 323 ◽  
pp. 55-64 ◽  
Author(s):  
Seyed Javad Amirfakhri ◽  
Pierre-Alexandre Pascone ◽  
Jean-Luc Meunier ◽  
Dimitrios Berk
Keyword(s):  
Reduction Reaction ◽  
Neutral Solution ◽  
H2o2 Reduction ◽  
Doped Graphene

Facile synthesis of cobalt and nitrogen co-doped graphene networks from polyaniline for oxygen reduction reaction in acidic solutions

2016 ◽  
Vol 4 (10) ◽  
pp. 3678-3682 ◽  
Author(s):  
Shuqin Peng ◽  
Hongmei Jiang ◽  
Youming Zhang ◽  
Lu Yang ◽  
Shuqin Wang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
High Oxygen ◽  
Facile Synthesis ◽  
Acidic Solutions ◽  
Polyaniline Nanofibers ◽  
Reduction Activity ◽  
Doped Graphene ◽  
Co Doped

Co and N co-doped graphene networks derived from polyaniline nanofibers can show high oxygen reduction activity in acidic solutions.

Voltammetric stabilization of electrofaceted (100)-type platinum electrodes in acidic solutions

1988 ◽  
Vol 66 (9) ◽  
pp. 2259-2267 ◽  
Author(s):  
Sara Alfonsina Dora Aldabe De Bilmes ◽  
María Cristina Giordano ◽  
Alejandro Jorge Arvia
Keyword(s):  
Competitive Adsorption ◽  
Co Adsorption ◽  
Surface Modifications ◽  
Electrolyte Composition ◽  
Potential Range ◽  
Platinum Electrodes ◽  
Potential Cycling ◽  
Acidic Solutions ◽  
Solution Interface ◽  
Pt Electrodes

The voltammetric stabilization of electrofaceted (100)-type Pt electrodes prepared from polycrystalline Pt by fast repetitive triangular potential cycling are followed by conventional voltammetry in the H-electroadsorption/electrodesorption potential range in either 1 M H2SO4 (0 to 35 °C) or 0.5 M HClO4 (−2 to 35 °C). The influence of CO adsorption on the stabilized voltammetric profile is also considered. Depending on the potential cycling used in conventional voltammetry, two well-defined stabilized profiles at 0.1 V/s in the H-electroadsorption/electrodesorption range can be obtained, namely, that corresponding to the H-adsorption stabilized electrofaceted (100)-type Pt, and that related to the O-adsorption stabilized electrofaceted (100)-type Pt.The changes in the conventional voltammetric profiles can be interpreted in terms of surface modifications basically associated with either adsorption or electroadsorption processes. The influence of the anion (electrolyte composition) prevailing in solution is accounted for in terms of a competitive adsorption between anions and H-adatoms. The influence of temperature in the range covered by this work is smaller than that of the structure of the solution at the electrode/solution interface.

ELECTROCHEMICAL CURRENT OSCILLATIONS DURING LOCALIZED CORROSION OF IRON

2003 ◽  
Vol 03 (04) ◽  
pp. L433-L454 ◽  
Author(s):  
DIMITRA SAZOU ◽  
MICHAEL PAGITSAS
Keyword(s):  
Pitting Corrosion ◽  
Chloride Concentration ◽  
Transient Behavior ◽  
Localized Corrosion ◽  
Iron Electrode ◽  
Present System ◽  
Oscillatory Pattern ◽  
Current Oscillations ◽  
Electrochemical Current ◽  
Active Transition

In the present work the onset of current oscillations at late stages of iron pitting corrosion in chloride containing sulfuric acid solutions is further studied. By increasing the chloride concentration and potential, repassivation of iron becomes gradually unlikely giving rise to the formation of salt layers in front of the iron electrode and electropolishing processes. Occurrence of qualitative changes in electrochemical current oscillations as the chloride concentration and potential are varied is shown and discussed. Analysis of the transient behavior of current vs. time curves occurring before the establishment of a specific oscillatory pattern, reflect changes in the composition of salt layers in front of the electrode. At a critical potential value (bifurcation potential, E bif ) the system exhibits a transition from one type of oscillations (beating, aperiodic bursting) to another (chaotic oscillations of small amplitude). The temporal behavior of the system at potentials E < E bif is associated with a characteristic average time between bursts indicative of crisis-induced intermittency. In terms of physicochemical processes, the E bif coincides with the repassivation potential used in steady-state pitting corrosion studies to indicate different states of dissolution due to changes in the pit chemistry. Since the present system exhibits a non-steady passive-active transition state we suggest that E bif implies a transition from the electropolishing state dissolution to a passive-active state dissolution due to changes in the concentration of chloride and hydrogen ions inside pits.

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