Electrochemical Properties of an Atomically Dispersed Platinum Catalyst Formed on a Heat-treated Carbon Support

2016 ◽  
Vol 1 (12) ◽  
pp. 3189-3196 ◽  
Author(s):  
Hideo Inoue ◽  
Takafumi Ishii ◽  
Naokatsu Kannari ◽  
Jun-ichi Ozaki
Keyword(s):  
Electrochemical Properties ◽  
Platinum Catalyst ◽  
Carbon Support ◽  
Heat Treated ◽  
Treated Carbon

scholarly journals Cyclic Voltammetry Characterization of Au, Pd, and AuPd Nanoparticles Supported on Different Carbon Nanofibers

Surfaces ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 205-215 ◽  
Author(s):  
Anna Testolin ◽  
Stefano Cattaneo ◽  
Wu Wang ◽  
Di Wang ◽  
Valentina Pifferi ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Surface Chemistry ◽  
Carbon Nanofibers ◽  
Photoelectron Spectroscopy ◽  
Carbon Support ◽  
Carbon Surface ◽  
Carbon Supports ◽  
Heat Treated ◽  
Temperature Heat ◽  
Treated Carbon

Three types of carbon nanofibers (pyrolytically stripped carbon nanofibers (PS), low-temperature heat treated carbon nanofibers (LHT), and high-temperature heat treated carbon nanofibers (HHT)) with different graphitization degrees and surface chemistry have been used as support for Au, Pd, or bimetallic AuPd alloy nanoparticles (NPs). The carbon supports have been characterized using Raman, X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV). Moreover, the morphology of the metal nanoparticles was investigated using transmission electron microscopy (TEM) and CV. The different properties of the carbon-based supports (particularly the graphitization degree) yield different electrochemical behaviors, in terms of potential window widths and electrocatalytic effects. Comparing the electrochemical behavior of monometallic Au and Pd and bimetallic AuPd, it is possible to observe the interaction of the two metals when alloyed. Moreover, we demonstrate that carbon surface has a strong effect on the electrochemical stability of AuPd nanoparticles. By tuning the Au-Pd nanoparticles’ morphology and modulating the surface chemistry of the carbon support, it is possible to obtain materials characterized by novel electrochemical properties. This aspect makes them good candidates to be conveniently applied in different fields.

scholarly journals Ruling Factors in Cinnamaldehyde Hydrogenation: Activity and Selectivity of Pt-Mo Catalysts

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 362
Author(s):  
Marta Stucchi ◽  
Maela Manzoli ◽  
Filippo Bossola ◽  
Alberto Villa ◽  
Laura Prati
Keyword(s):  
Photoelectron Spectroscopy ◽  
Pt Nanoparticles ◽  
Carbon Support ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Hydrogenation Catalysts ◽  
Cinnamaldehyde Hydrogenation ◽  
Transmission Electron ◽  
Heat Treated ◽  
Heating Treatment

To obtain selective hydrogenation catalysts with low noble metal content, two carbon-supported Mo-Pt bimetallic catalysts have been synthesized from two different molybdenum precursors, i.e., Na2MoO4 and (NH4)6Mo7O24. The results obtained by X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) combined with the presence and strength of acid sites clarified the different catalytic behavior toward cinnamaldehyde hydrogenation. After impregnating the carbon support with Mo precursors, each sample was used either as is or treated at 400 °C in N2 flow, as support for Pt nanoparticles (NPs). The heating treatment before Pt deposition had a positive effect on the catalytic performance. Indeed, TEM analyses showed very homogeneously dispersed Pt NPs only when they were deposited on the heat-treated Mo/C supports, and XPS analyses revealed an increase in both the exposure and reduction of Pt, which was probably tuned by different MoO3/MoO2 ratios. Moreover, the different acid properties of the catalysts resulted in different selectivity.

Electrochemical Properties of Carbons Obtained From Precursors of Electrochemically Polymerized Polymers

1995 ◽  
Vol 393 ◽  
Author(s):  
Kenichi Hashizume ◽  
Miho Tsutsup ◽  
Tomohiko Kaneko ◽  
Sugio Otani ◽  
Susumu Yoshimura
Keyword(s):  
Electrochemical Properties ◽  
Propylene Carbonate ◽  
Electrolyte Solution ◽  
Lithium Doping ◽  
Heat Treated

ABSTRACTElectrochemically polymerized polymers from pyrrole, fluoranthene and pyrene were heat-treated at temperatures between 600 to 3000 °C. The electrochemical properties of these heat-treated samples were examined by chronoamperometry using an electrolyte solution of IM LiClO4in propylene carbonate. Lithium doping capacities of carbons from fluoranthene and pyrrole polymer heat-treated at 3000 °C were 1.5 and 1.2 times that of the theoretical capacity of graphite as LiC6, respectively.

Electrochemical properties of the heat-treated Ti-6Al-4V alloy manufactured by Direct Energy Deposition

2021 ◽  
pp. 163226
Author(s):  
Svetlana A. Shalnova ◽  
Marina O. Gushchina ◽  
Darya A. Strekalovskaya ◽  
Ekaterina L. Alekseeva ◽  
Olga G. Klimova-Korsmik
Keyword(s):  
Electrochemical Properties ◽  
Energy Deposition ◽  
Direct Energy Deposition ◽  
Heat Treated ◽  
Direct Energy

INVESTIGATION OF THE ELECTROCHEMICAL BEHAVIOR OF HEAT-TREATED CARBON BLACKS AND Pt/C CATALYSTS

2002 ◽  
Vol 09 (03n04) ◽  
pp. 1443-1452 ◽  
Author(s):  
C. D. HUANG ◽  
Z. T. XIONG ◽  
J. Y. LIN ◽  
K. L. TAN
Keyword(s):  
Carbon Black ◽  
Electrochemical Behavior ◽  
Catalyst Support ◽  
Carbon Surface ◽  
Carbon Blacks ◽  
Heat Treated ◽  
Platinum Particles ◽  
Electro Oxidation ◽  
Treated Carbon ◽  
Xps Study

In this paper we report the electrochemical behavior of heat-treated carbon blacks and Pt/C catalysts. Cyclic voltammetry indicates that the heat-treated carbon black as catalyst support does not improve the Pt/C catalyst's activity for methanol oxidation. An XPS study of a Pt-loaded carbon black indicates that the amounts of oxidized platinum and oxygen-functional groups on catalysts are decreased when the platinum particles are deposited on the heat-treated carbon surface. These changes in the surface and crystalline structural properties of carbon materials lead to the catalytic activity change in methanol electro-oxidation.

scholarly journals Carbon-Supported Fe Catalysts forCO2Electroreduction to High-Added Value Products: A DEMS Study: Effect of the Functionalization of the Support

2011 ◽  
Vol 2011 ◽  
pp. 1-13 ◽  
Author(s):  
S. Pérez-Rodríguez ◽  
G. García ◽  
L. Calvillo ◽  
V. Celorrio ◽  
E. Pastor ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ethylene Glycol ◽  
Surface Chemistry ◽  
Physicochemical Properties ◽  
Electrochemical Properties ◽  
Textural Properties ◽  
Carbon Support ◽  
Product Distribution ◽  
Added Value ◽  
Fe Catalysts

Vulcan XC-72R-supported Fe catalysts have been synthesised for the electroreduction of CO2to high-added value products. Catalysts were obtained by the polyol method, using ethylene glycol as solvent and reducing agent. Prior to the metal deposition, Vulcan was subjected to different oxidation treatments in order to modify its surface chemistry and study its influence on the physicochemical and electrochemical properties of the catalysts, as well as on the product distribution. The oxidation treatments of the supports modify their textural properties, but do not affect significantly the physicochemical properties of catalysts. However, DEMS studies showed that the carbon support degradation, the distribution of products, and the catalytic activity toward the CO2electroreduction reaction depend significantly on the surface chemistry of the carbon support.

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