Electrochemical Oxidation of Methanol at Pt Modified Electrode in Carbonate Solution

2013 ◽  
Vol 11 (2) ◽  
Author(s):  
M. A. Ibrahim
Keyword(s):  
Electrochemical Oxidation ◽  
Methanol Oxidation ◽  
Modified Electrode ◽  
Current Density ◽  
Carbonate Solution ◽  
Pt Electrode ◽  
Oxidation Of Methanol

In this paper, we discuss the effect of Pb, Cd, Ni, Zn, and Mn adatoms on the rate of methanol oxidation at the Pt electrode in the carbonate solution. In Na2B4O7, the presence of Cd, Ni, Mn, and Zn adatoms increased the electrocatalytic current density while the presence of Pb inhibits the methanol oxidation.

scholarly journals Electrochemical oxidation of methanol on Pt/(RuxSn1-x)O2 nanocatalyst

2013 ◽  
Vol 78 (11) ◽  
pp. 1703-1716 ◽  
Author(s):  
Mila Krstajic ◽  
Maja Obradovic ◽  
Biljana Babic ◽  
Velimir Radmilovic ◽  
Uros Lacnjevac ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Methanol Oxidation ◽  
Pt Nanoparticles ◽  
Atomic Ratio ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Oxidation Of Methanol ◽  
Potentiodynamic Polarization Curves ◽  
Transmission Electron

The Ru-doped SnO2 powder, (RuxSn1-x)O2, with the Sn:Ru atomic ratio of 9:1 was synthesized and used as a support for Pt nanoparticles (30 mass% loading). The (RuxSn1-x)O2 support and Pt/(RuxSn1-x)O2 catalyst were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy and transmission electron microscopy (TEM). (RuxSn1-x)O2 was found to be two-phase material consisting of probably solid solution of RuO2 in SnO2 and pure RuO2. The average Pt particle size determined by TEM was 5.3 nm. Cyclic voltammetry of Pt/(RuxSn1-x)O2 indicated good conductivity of the sup-port and displayed usual features of Pt. The results of the electrochemical oxidation of COads and methanol on Pt/(RuxSn1-x)O2 were compared with those on commercial Pt/C and PtRu/C catalysts. Oxidation of COads on Pt/(RuxSn1-x)O2 starts at less positive potentials than on PtRu/C and Pt/C. Potentiodynamic polarization curves and chronoamperometric curves of methanol oxidation indicated higher initial activity of Pt/(RuxSn1-x)O2 catalyst compared to PtRu/C, but also a greater loss in the current density over time. Potentiodynamic stability test of the catalysts revealed that deactivation of the Pt/(RuxSn1-x)O2 and Pt/C was primarily caused by the poisoning of Pt surface by the methanol oxidation residues, which mostly occurred during the first potential cycle. In the case of PtRu/C the poisoning of the surface was minor and deactivation was caused by the PtRu surface area loss.

scholarly journals Electrochemical oxidation of methanol on Pt3Co bulk alloy

2003 ◽  
Vol 68 (11) ◽  
pp. 859-870 ◽  
Author(s):  
Snezana Gojkovic
Keyword(s):  
Kinetic Parameters ◽  
Electrochemical Oxidation ◽  
Methanol Oxidation ◽  
Reaction Pathway ◽  
Acid Solutions ◽  
Bulk Alloy ◽  
Promoting Effect ◽  
Rate Determining Step ◽  
Oxidation Of Methanol ◽  
Reaction Orders

The electrochemical oxidation of methanol was investigated on a Pt3Co bulk alloy in acid solutions. Kinetic parameters such as transfer coefficient reaction orders with respect to methanol and H+ ions and energy of activation were determined. It was found that the rate of methanol oxidation is significantly diminished by rotation of the electrode. This effect was attributed to the diffusion of formaldehyde and formic acid from the electrode surface. Stirring of the electrolyte also influenced the kinetic parameters of the reaction. It was speculated that the predominant reaction pathway and rate determining step are different in the quiescent and in the stirred electrolyte. Cobalt did not show a promoting effect on the rate of methanol oxidation on the Pt3Co bulk alloy with respect to a pure Pt surface.

Electrochemical Oxidation of Perfluorooctanesulfonate by Magnéli Phase Ti4O7 Electrode in the Presence of Trichloroethylene

2020 ◽  
Vol 1 (4) ◽  
Author(s):  
Peizeng Yang ◽  
Yaye Wang ◽  
Junhe Lu ◽  
Viktor Tishchenko ◽  
Qingguo Huang ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Current Density ◽  
First Order ◽  
Degradation Rates ◽  
Oxidation Technology ◽  
Magnéli Phase ◽  
Polyfluoroalkyl Substances ◽  
Titanium Suboxide ◽  
Gas Tight ◽  
Magneli Phase

This study examined the degradation of perfluorooctanesulfonate (PFOS) in electrochemical oxidation (EO) processes in the presence of trichloroethylene (TCE). The EO experiment was performed in a gas-tight reactor using Magnéli phase titanium suboxide (Ti4O7) as the anode. The experimental data demonstrated that 75% of PFOS (2 μM) was degraded at 10 mA/cm2 current density in 30 min without TCE present in the solution, while the presence of 76 μM TCE apparently inhibited the degradation of PFOS, reducing its removal down to 53%. Defluorination ratio suggested that PFOS was significantly mineralized upon EO treatment, and it appeared to be not influenced by the presence of TCE. The respective pseudo-first order rate constants (kobs) of PFOS removal were 0.0471 and 0.0254 min-1 in the absence and presence of TCE. The degradation rates of both PFOS and TCE increased with current density rising from 2.5 to 20 mA/cm2. In the presence of TCE, chloride, chlorate, and perchlorate were formed that accounted for 79.7 %, 5.53%, and 1.51% of the total chlorine at 60 min. This work illustrates the promise of the Magnéli phase Ti4O7 electrode based electrochemical oxidation technology for degrading per- and polyfluoroalkyl substances (PFASs) and co-contaminants in groundwaters.

scholarly journals Electrochemical Oxidation of Saccharose on Copper (Hydr)oxide-Modified Electrode in Alkaline Media

2010 ◽  
Vol 31 (11-12) ◽  
pp. 1351-1357 ◽  
Author(s):  
Majid JAFARIAN ◽  
Mehdi RASHVAND AVEI ◽  
Iman DANAEE ◽  
Fereydoon GOBAL ◽  
Mohammad G. MAHJANI
Keyword(s):  
Electrochemical Oxidation ◽  
Modified Electrode ◽  
Alkaline Media

Palladium-polymer nanocomposite: An anode catalyst for the electrochemical oxidation of methanol

2017 ◽  
Vol 42 (37) ◽  
pp. 23599-23605 ◽  
Author(s):  
Samarjeet Siwal ◽  
Sophy Matseke ◽  
Siyasanga Mpelane ◽  
Nishu Hooda ◽  
Debkumar Nandi ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Polymer Nanocomposite ◽  
Anode Catalyst ◽  
Oxidation Of Methanol

Enhanced Electrochemical Oxidation of BH4− on Pt Electrode in Alkaline Electrolyte with the Addition of Thiourea

2010 ◽  
Vol 132 ◽  
pp. 271-278 ◽  
Author(s):  
Dan Mei Yu ◽  
Chang Guo Chen ◽  
Shu Lei ◽  
Xiao Yuan Zhou ◽  
Guo Zhong Cao
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Oxidation ◽  
Electrochemical Impedance ◽  
Alkaline Electrolyte ◽  
Hydroxyl Groups ◽  
Catalytic Hydrolysis ◽  
Direct Oxidation ◽  
Pt Electrode ◽  
Separation Membrane ◽  
And Diffusion

The electrochemical oxidation of sodium borohydride (NaBH4) on Pt electrode in alkaline electrolyte with the addition of thiourea has been studied by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronopotentiometry (CP). NaBH4 is readily to react with hydroxyl groups to release hydrogen through either direct oxidation or catalytic hydrolysis. The experimental results demonstrated that the addition of an appropriate amount of thiourea to the alkaline electrolyte resulted in the suppression of catalytic hydrolysis and diffusion of borohydride ions through the separation membrane.

Electrochemical oxidation of methanol on mesoporous nickel phosphates and Si-incorporated mesoporous nickel phosphates

2013 ◽  
Vol 27 ◽  
pp. 141-143 ◽  
Author(s):  
Juan Tan ◽  
Jing-He Yang ◽  
Xuhong Liu ◽  
Fei Yang ◽  
Xuying Li ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Oxidation Of Methanol ◽  
Nickel Phosphates
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