Effective electrocatalytic reduction of propene at a Pt electrode in strongly acidic solutions with Mo(VI) oxo-species

2012 ◽  
Vol 24 ◽  
pp. 5-8 ◽  
Author(s):  
Maria Bełtowska-Brzezinska ◽  
Tomasz Węsierski ◽  
Teresa Łuczak
Keyword(s):  
Electrocatalytic Reduction ◽  
Pt Electrode ◽  
Acidic Solutions

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

Cover Picture: Electrocatalytic Reduction of Nitrate on a Pt Electrode Modified by p-Block Metal Adatoms in Acid Solution (ChemCatChem 7/2013)

ChemCatChem ◽  
2013 ◽  
Vol 5 (7) ◽  
pp. 1617-1617
Author(s):  
Jian Yang ◽  
Federico Calle-Vallejo ◽  
Matteo Duca ◽  
Marc T. M. Koper
Keyword(s):  
Acid Solution ◽  
Electrocatalytic Reduction ◽  
Pt Electrode

Electrocatalytic Reduction of Nitrate on a Pt Electrode Modified by p-Block Metal Adatoms in Acid Solution

ChemCatChem ◽  
2013 ◽  
Vol 5 (7) ◽  
pp. 1773-1783 ◽  
Author(s):  
Jian Yang ◽  
Federico Calle-Vallejo ◽  
Matteo Duca ◽  
Marc T. M. Koper
Keyword(s):  
Acid Solution ◽  
Electrocatalytic Reduction ◽  
Pt Electrode

Selective control and rate enhancement of reactions involving catalytic reduction of organohalides and reduced form of myoglobulin in microemulsions

2004 ◽  
Vol 76 (4) ◽  
pp. 815-828 ◽  
Author(s):  
G. N. Kamau ◽  
B. Munge
Keyword(s):  
Rate Constants ◽  
Pyrolytic Graphite ◽  
Reduced Form ◽  
Carbon Electrodes ◽  
Hexadecyltrimethylammonium Bromide ◽  
Electrocatalytic Reduction ◽  
Pt Electrode ◽  
Average Value ◽  
Pt Electrodes ◽  
Scan Rate

Myoglobin (horse heart, Mb) adsorbed on carbon electrodes or in solution at platinum electrodes was used for electrocatalytic reduction of trans-1,2-dibromocyclohexane (DBCH) and trichloroacetic acid (TCA) in a bicontinuous microemulsion, prepared from sodium didodecyl sulfate (SDS) or hexadecyltrimethylammonium bromide (CTAB), tetradecane, pentanol, and water. Carbon electrodes (glassy carbon, GC, and pyrolytic graphite, PG) exhibited adsorption peaks, whereas platinum (Pt) portrayed diffusion-controlled peaks. Electrode reduction of Mb had E0' at −0.179 ± 0.013 V at GC/SDS, −0.189 ± 0.015 at GC/CTAB, and −0.562 ± 0.018 at Pt/SDS and 0.611 ± 0.008 at Pt/CTAB media.Current efficiencies for electrocatalytic reduction of TCA were higher than that for reduction of dibromocyclohexane. For both substrates, dibromocyclohexane and trichhloroacetic acid, a lowering of overpotential of at least 1.3 V was achieved. Overall, the Pt electrode exhibited higher catalytic efficiencies compared to carbon electrodes, suggesting higher surface concentration and unhindered orientation of the substrate on the Pt electrode. For DBCH, catalytic efficiencies decreased with scan rate, at carbon electrodes as expected for homogeneous solutions, whereas an average value of 2.22 ± 0.42 in SDS and 3.29 ± 0.76 in CTAB microemulsion was obtained at Pt electrodes at a scan rate range of 15 to 3000 mVs−1. Pseudo-first-order rate constants (k') for the rate-determining step (rds) involving reaction of organohalides with catalyst had an average value of 41 ±1 M−1 s−1 for reduction of DBCH/SDS and 4.8 ± 1.0 ×102 M−1 s−1 for reduction of TCA/SDS. Moreover, rate constants were higher in CTAB microemulsion, giving values of 1.5 ±0.016 ×102 and 2.75 ±0.67 × 103 M−1 s−1 for DBCH and TCA, respectively. Positive interfacial charge of the microemulsion conduits influenced catalytic reaction of catalyst and the substrate. Under the conditions of the experiment, no hydrogen evolution was observed at Pt electrodes.

Electrocatalytic Reduction of Carbon Dioxide on Sn-Pb Alloy Electrodes

2016 ◽  
Vol 7 (3) ◽  
pp. 231 ◽  
Author(s):  
Song Yi Choi ◽  
Soon Kwan Jeong ◽  
Ki Tae Park
Keyword(s):  
Carbon Dioxide ◽  
Electrocatalytic Reduction

Effects of Doping on the Electrochemical and Electrical Properties of Poly(2,5-di(2-thienyl)pyrrole)

1999 ◽  
Vol 64 (8) ◽  
pp. 1357-1368 ◽  
Author(s):  
Enric Brillas ◽  
José Carrasco ◽  
Ramon Oliver ◽  
Francesc Estrany ◽  
Víctor Ruiz
Keyword(s):  
Mass Spectrometry ◽  
Fast Atom Bombardment ◽  
Oxidation Potential ◽  
Ethanolic Solution ◽  
Pt Electrode ◽  
Reversible Process ◽  
Oxidation Potentials ◽  
Lower Productivity ◽  
Polymeric Chains ◽  
Linear Molecules

The electropolymerization of 2,5-di(2-(thienyl)pyrrole) (SNS) on a Pt electrode from ethanolic solution with LiClO4 or LiCl as electrolyte has been studied by cyclic voltammetry (CV) and chronoamperometry (CA). In both media, a quasi-reversible process has been indicated by CV, reversing the scan at low oxidation potentials. Under these conditions, reducible positive charges formed in both oxidized polymers are compensated by the entrance of anions from solution. Elemental analysis reveals that polymers generated at a low oxidation potential by CA contain a 21.03% (w/w) of ClO4- or a 9.56% (w/w) of Cl-. The poly(SNS) doped with Cl- presents higher proportion of reducible positive charges, higher polymerization charge and lower productivity. A much higher electrical conductivity, however, has been found for the poly(SNS) doped with ClO4-. Both polymers are soluble in DMSO, acetone and methanol. The dimer, trimer, tetramer and pentamer have been detected as soluble and neutral linear oligomers by mass spectrometry-fast atom bombardment. The analysis of polymers by infrared spectroscopy confirms the predominant formation of linear molecules with α-α linkages between monomeric units. A condensation mechanism involving one-electron oxidation of all electrogenerated linear and neutral polymeric chains is proposed to explain the SNS electropolymerization.

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