Preparation and Characterization of Platinum/Ceria-based Catalysts for Methanol Electro-oxidation in Alkaline Medium

2012 ◽  
Vol 1446 ◽  
Author(s):  
Christian L. Menéndez ◽  
Ana-Rita Mayol ◽  
Carlos R. Cabrera
Keyword(s):  
Particle Size ◽  
Cyclic Voltammetry ◽  
Cerium Oxide ◽  
Alkaline Medium ◽  
Glassy Carbon ◽  
Composite Electrodes ◽  
Deposition Technique ◽  
Electro Oxidation

ABSTRACTPlatinum/Cerium oxide-based catalysts for methanol electro oxidation were prepared by the occlusion deposition technique. Composite glassy carbon (GC) electrodes were modified and then tested towards the methanol electro oxidation half reaction in acid and alkaline medium. Cyclic voltammetry and chronoamperometry techniques were used to test the catalytic response of the composite electrodes. AFM studies were carried out in order to have a measurement of the particle size and distribution of the platinum/ceria catalyst on HOPG.

scholarly journals Electrocatalysis of Ethanol and Methanol Electrooxidation by Composite Electrodes with NiOOH/FeOOH Supported on Reduced Graphene Oxide onto Composite Electrodes

2020 ◽  
Vol 2 (1) ◽  
pp. 2
Author(s):  
João Pedro Jenson de Oliveira ◽  
Acelino Cardoso de Sá ◽  
Leonardo Lataro Paim
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Alkaline Medium ◽  
Methanol Electrooxidation ◽  
Potential Range ◽  
Composite Electrodes ◽  
Reduced Graphene ◽  
Iron Nickel ◽  
Nickel Oxyhydroxide

This paper presents graphite/paraffin composite electrodes modified with microparticles of nickel (Ni) and Ni-Fe alloy anchored in reduced graphene oxide (rGO); these electrodes were made by electrosynthesis. Firstly, the electrodeposition of reduced graphene oxide was made by cyclic voltammetry (CV) onto the graphite/paraffin electrodes’ surface. After electrodeposition of the rGO, iron and nickel were electrodeposited by CV with successive scans. Finally, the formation of iron-nickel oxyhydroxide on the electrode surface was performed by cyclic voltammetry in alkaline medium. The composites were investigated by field emission gun scanning electron microscopy (FEG-SEM); it was observed that the Ni microparticles had spherical shapes, while the Ni-Fe alloy did not present a defined shape. The composite electrodes were used to analysis ethanol and methanol electrooxidation in an alkaline medium of 0.10 mol L−1 of NaOH in a potential range of from −0.20 to 1.0 V (vs. Ag/AgCl) at 50 mV s−1 by CV. The electrodes were able to make the electrooxidation of ethanol at a potential of around 0.57 V for the electrode constituted by the Ni-Fe alloy and around 0.61 V for the electrode modified with Ni, and for methanol in a potential around 0.57 V for the Ni-Fe alloy and around 0.66 V for the Ni electrode. The Ni-Fe alloy electrodes showed the electrocatalysis of the alcohols in relation to Ni electrodes.

Preparation and Characterization of Pt-SnO2 Deposited on Multi-Walled Carbon Nano-Tubes for Methanol Electro-Oxidation

2013 ◽  
Vol 815 ◽  
pp. 508-511
Author(s):  
Dan Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Cyclic Voltammetry ◽  
Pt Nanoparticles ◽  
Electrochemical Performances ◽  
Tin Oxides ◽  
Carbon Nano Tubes ◽  
Electro Oxidation

In this research, a sequential sol-thermal route has been used to prepare the SnO2 nanocolloid, Pt nanoparticles were then deposited on the nanosupport to obtain the Pt-SnO2/MWCNTs. The electrochemical performances of the catalysts were characterized by cyclic voltammetry and chronoamperometry. The Pt (fcc) crystalline was proved to be form on the surface of carbon nanotubes. The Pt based catalyst modified by tin oxides exhibit a electro-chemical performance for methanol electro-oxidation.

scholarly journals STUDY ON ELECTRO-OXIDATION OF GLYCEROL IN ALKALINE MEDIUM USING TRIMETALLIC Pt-Pd-Ni COMPOSITE ELECTRODEPREPARED ON GLASSY CARBON

2018 ◽  
Vol 55 (5B) ◽  
pp. 126
Author(s):  
Huynh Thi Lan Phuong
Keyword(s):  
Activation Energy ◽  
Cyclic Voltammetry ◽  
Reaction Mechanism ◽  
Glassy Carbon ◽  
Oxidation Process ◽  
Diffusion Mechanism ◽  
Effect Of Temperature ◽  
First Order ◽  
Trimetallic Catalyst ◽  
Electro Oxidation

In this research, the effect of temperature and conversion of glycerol was studied by using cyclic voltammetry technique. The results showed that this reaction occurred following to diffusion mechanism with activation energy approximately of 3.44 (kcal/mol). Moreover, conversion of glycerol by electrolysis using Pt-Pd-Ni/C catalyst also was investigated and compared with the case of using pure Pt. Electrolysis process with electrode Pt-Pd-Ni/GC and pure Pt-was occurred by the first order and this result was well-suit with the previous study about the reaction mechanism of glycerol electro-oxidation process. Obtained results showed that conversion of glycerol on the trimetallic catalyst was higher than the pure Pt.

Hybrid Supercapacitors Based on Polyaniline and Carbon Aerogels Composite Electrode Materials

2011 ◽  
Vol 391-392 ◽  
pp. 18-22
Author(s):  
Zheng Jin ◽  
Dong Yu Zhao ◽  
Bo Hong Li ◽  
Xiao Min Ren ◽  
Shan Tao Yan ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Specific Capacitance ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Carbon Aerogels ◽  
Composite Electrodes ◽  
Long Cycle Life ◽  
Hybrid Supercapacitors

The purpose of this paper is to develop feasible composite electrodes with a long cycle life and large specific capacitance and to investigate optimal ratio between aniline and carbon aerogels (CA) materials. The characterization of the composite electrode materials was studied by using scanning electron microscopy (SEM), electrochemical impedance spectroscopy, cyclic voltammetry (CV) and the constant charge-discharge. The specific capacitance of the composite electrode materials, measured using cyclic voltammetry at scan rate of 1mV•s-1, was found to be 1139.66F•g-1. For a simple supercapcitor, the highest specific capacitance (127.53 F•g-1 at 30mA) is obtained at ratio between aniline and CA is 1:4.

CHARACTERIZATION OF Pt–Rh–Ru CATALYSTS FOR METHANOL OXIDATION

2011 ◽  
Vol 04 (02) ◽  
pp. 187-191 ◽  
Author(s):  
MACIEJ CHOTKOWSKI ◽  
MONIKA UKLEJEWSKA ◽  
HANNA SIWEK ◽  
JUSTYNA DŁUBAK ◽  
ANDRZEJ CZERWIŃSKI
Keyword(s):  
Cyclic Voltammetry ◽  
Stripping Voltammetry ◽  
Solution Composition ◽  
Acidic Solutions ◽  
Oxidation Of Methanol ◽  
Constant Potential ◽  
Electro Oxidation ◽  
Alloy Catalysts ◽  
Potential Conditions

Pt – Rh – Ru alloy catalysts for methanol electro-oxidation were prepared by electrochemical deposition under constant potential conditions. The Pt : Rh : Ru ratio was varied by changing electroplating solution composition. Obtained catalysts were examined electrochemically in acidic solutions containing methanol. Stripping voltammetry was applied to study adsorption of methanol on the electrodes surfaces while oxidation of methanol from solution was studied by means of chronoamperometry and cyclic voltammetry. The highest electrocatalytic activity was observed for an alloy with the highest obtained ruthenium concentration of 31%.

Electrochemical characterization of luminol and its determination in real samples

2014 ◽  
Vol 6 (19) ◽  
pp. 7809-7813 ◽  
Author(s):  
Gulcemal Yildiz ◽  
Ugur Tasdoven ◽  
Necati Menek
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon ◽  
Electrochemical Behavior ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Solution Ph ◽  
Real Samples ◽  
Pulse Voltammetry

The electrochemical behavior of luminol, an important molecule in forensic science, was studied in Britton–Robinson buffer solution (pH 2–pH 13) at a glassy carbon electrode using cyclic voltammetry and differential pulse voltammetry techniques.

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