Appearance of a New Oscillation (Named Oscillation C) in H2O2-Reduction Reaction on a Pt Electrode in Acidic Solutions by Addition of a Small Amount of Chloride Ions

1998 ◽  
Vol 27 (10) ◽  
pp. 1009-1010 ◽  
Author(s):  
Yoshiharu Mukouyama ◽  
Hidemitsu Konishi ◽  
Shuji Nakanishi ◽  
Yoshihiro Nakato
Keyword(s):  
Reduction Reaction ◽  
Chloride Ions ◽  
Pt Electrode ◽  
Acidic Solutions ◽  
H2o2 Reduction

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 Mixed Lithium and Sodium Ion Aprotic DMSO Electrolytes for Oxygen Reduction on Au and Pt Studied by DEMS and RRDE

2021 ◽  
Author(s):  
M. Hegemann ◽  
P. P. Bawol ◽  
A. Köllisch-Mirbach ◽  
H. Baltruschat
Keyword(s):  
Oxygen Reduction ◽  
Product Distribution ◽  
Reduction Reaction ◽  
Mixed Electrolytes ◽  
Peroxide Formation ◽  
Pt Electrode ◽  
Rate Determining Step ◽  
Differential Electrochemical Mass Spectrometry ◽  
Redox Couples ◽  
Pt Electrodes

AbstractIn order to advance the development of metal-air batteries and solve possible problems, it is necessary to gain a fundamental understanding of the underlying reaction mechanisms. In this study we investigate the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER, from species formed during ORR) in Na+ containing dimethyl sulfoxide (DMSO) on poly and single crystalline Pt and Au electrodes. Using a rotating ring disk electrode (RRDE) generator collector setup and additional differential electrochemical mass spectrometry (DEMS), we investigate the ORR mechanism and product distribution. We found that the formation of adsorbed Na2O2, which inhibits further oxygen reduction, is kinetically favored on Pt overadsorption on Au. Peroxide formation occurs to a smaller extent on the single crystal electrodes of Pt than on the polycrystalline surface. Utilizing two different approaches, we were able to calculate the heterogeneous rate constants of the O2/O2− redox couple on Pt and Au and found a higher rate for Pt electrodes compared to Au. We will show that on both electrodes the first electron transfer (formation of superoxide) is the rate-determining step in the reaction mechanism. Small amounts of added Li+ in the electrolyte reduce the reversibility of the O2/O2− redox couples due to faster and more efficient blocking of the electrode by peroxide. Another effect is the positive potential shift of the peroxide formation on both electrodes. The reaction rate of the peroxide formation on the Au electrode increases when increasing the Li+ content in the electrolyte, whereas it remains unaffected on the Pt electrode. However, we can show that the mixed electrolytes promote the activity of peroxide oxidation on the Pt electrode compared to a pure Li+ electrolyte. Overall, we found that the addition of Li+ leads to a Li+-dominated mechanism (ORR onset and product distribution) as soon as the Li+ concentration exceeds the oxygen concentration. Graphical abstract

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

Catalytic effect of molybdenum oxo-species on reduction of allyl alcohol at a Pt electrode in strongly acidic solutions

2012 ◽  
Vol 63 ◽  
pp. 89-99 ◽  
Author(s):  
Maria Bełtowska-Brzezinska ◽  
Tomasz Węsierski ◽  
Teresa Łuczak ◽  
Józef Camra
Keyword(s):  
Allyl Alcohol ◽  
Catalytic Effect ◽  
Pt Electrode ◽  
Acidic Solutions

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.

The Measurement of Mixed Potentials Using Platinum Decorated Nanoporous Gold Electrodes

2022 ◽  
Vol 169 (1) ◽  
pp. 016503
Author(s):  
Md. Shafiul Islam ◽  
Alan J. Branigan ◽  
Borkat Ullah ◽  
Christopher J. Freeman ◽  
Maryanne M. Collinson
Keyword(s):  
Fold Increase ◽  
Reduction Reaction ◽  
Open Circuit ◽  
Nanoporous Gold ◽  
Pt Electrode ◽  
Electrodeposition Time ◽  
Titration Curves ◽  
Redox Sensing ◽  
Redox Molecules ◽  
Mixed Potentials

Potentiometric redox sensing in solutions containing multiple redox molecules was evaluated using in-house constructed nanoporous gold (NPG)-platinum (Pt) and unmodified NPG electrodes. The NPG-Pt electrode was fabricated by electrodepositing Pt into the nanoporous framework of a chemically dealloyed NPG electrode. By varying the concentration of the Pt salt and the electrodeposition time, different amounts of Pt were introduced. Characterization by SEM shows the pore morphology doesn’t change with the addition of Pt and XPS indicates the electrodes contain ∼2.5–24 wt% Pt. Open-circuit potential (OCP) measurements in buffer and solutions containing ascorbic acid, cysteine, and/or uric acid show that the OCP shifts positive with the addition of Pt. These results are explained by an increase in the rate of the oxygen reduction reaction with the addition of Pt. The overall shape of the potentiometric titration curves generated from solutions containing one or more bioreagents is also highly dependent on the amount of Pt in the nanoporous electrode. Furthermore, the generation of OCP vs Log [bioreagent] from the results of the potentiometric experiments shows an ∼2-fold increase in sensitivity can result with the addition of Pt. These results indicate the promise that these electrodes have in potentiometric redox sensing.

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