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

Formation of volatile products during nitrate reduction on a Sn-modified Pt electrode in acid solution

2011 ◽  
Vol 662 (1) ◽  
pp. 87-92 ◽  
Author(s):  
Jian Yang ◽  
Matteo Duca ◽  
Klaas Jan P. Schouten ◽  
Marc T.M. Koper
Keyword(s):  
Acid Solution ◽  
Nitrate Reduction ◽  
Pt Electrode ◽  
Volatile Products

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.

Effect of cobalt bis(dicarbollides) on electrochemical oxygen reduction on Pt electrode in methanol–acid solution

2006 ◽  
Vol 51 (7) ◽  
pp. 1225-1234 ◽  
Author(s):  
Hidenobu Shiroishi ◽  
Yusuke Ayato ◽  
Jiří Rais ◽  
Keiji Kunimatsu ◽  
Masatoshi Osawa ◽  
...  
Keyword(s):  
Acid Solution ◽  
Oxygen Reduction ◽  
Pt Electrode ◽  
Electrochemical Oxygen

Extended Preservation of Iron for Transmission

1967 ◽  
Vol 25 ◽  
pp. 354-355
Author(s):  
E. P. Abrahamson II ◽  
M. W. Dumais
Keyword(s):  
Acid Solution ◽  
Perchloric Acid ◽  
Microscopy Study ◽  
Perchloric Acid Solution ◽  
Transmission Microscopy ◽  
Iron Base ◽  
Cold Stage

In a transmission microscopy study of iron and dilute iron base alloys, it was determined that it is possible to preserve specimens for extended periods of time. Our specimens were prepunched from 5 to 8 mil sheet to microscope size and annealed for several hours at 700°C. They were then thinned in a glacial acetic-12 percent perchloric acid solution using 10 volts and 20 milliamperes, at a temperature of 8 to 14°C.It was noted that by the use of a cold stage, the same specimen can be observed for periods up to one week without excess contamination. When removal of the specimen from the column becomes necessary, it was observed that a specimen may be kept for later observation in 1,2 dichloroethene or methanol for periods in excess of two weeks.

Deposited emulsion particles in the pores of aluminum oxide film

1978 ◽  
Vol 36 (1) ◽  
pp. 450-451
Author(s):  
Michio Ashida ◽  
Yasukiyo Ueda
Keyword(s):  
Oxide Film ◽  
Acid Solution ◽  
Barrier Layer ◽  
Colloidal Particles ◽  
Oxalic Acid Solution ◽  
Anodic Oxide ◽  
Anodic Oxide Film ◽  
Carbon Replica ◽  
Sectioning Method ◽  
Thin Sectioning

An anodic oxide film is formed on aluminum in an acidic elecrolyte during anodizing. The structure of the oxide film was observed directly by carbon replica method(l) and ultra-thin sectioning method(2). The oxide film consists of barrier layer and porous layer constructed with fine hexagonal cellular structure. The diameter of micro pores and the thickness of barrier layer depend on the applying voltage and electrolyte. Because the dimension of the pore corresponds to that of colloidal particles, many metals deposit in the pores. When the oxide film is treated as anode in emulsion of polyelectrolyte, the emulsion particles migrate onto the film and deposit on it. We investigated the behavior of the emulsion particles during electrodeposition.Aluminum foils (99.3%) were anodized in either 0.25M oxalic acid solution at 30°C or 3M sulfuric acid solution at 20°C. After washing with distilled water, the oxide films used as anode were coated with emulsion particles by applying voltage of 200V and then they were cured at 190°C for 30 minutes.

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