Electrochemical Characteristics of Carbon-Supported Metal Nanoparticles Catalysts Prepared by Electrical Deposition Methods

2007 ◽  
Vol 124-126 ◽  
pp. 1821-1824 ◽  
Author(s):  
Seok Kim ◽  
Yongju Jung ◽  
Young Seak Lee ◽  
Soo Jin Park
Keyword(s):  
Pt Nanoparticles ◽  
Electrochemical Characteristics ◽  
Pt Catalysts ◽  
Applied Potential ◽  
Potential Sweep ◽  
Loading Level ◽  
Graphite Nanofibers ◽  
Electrochemical Condition ◽  
Supported Platinum ◽  
Supported Metal Nanoparticles

Graphite nanofibers (GNFs)–supported platinum (Pt) catalysts had been prepared by an electrochemical deposition by controlling an applied potential to a potential of Pt reduction. Pt nanoparticles were successfully deposited by using potential sweep methods. The catalyst prepared by 18 sweep times showed the lowest resistance and the highest electroactivity. These electrochemical properties were dependent on the size, loading level, and morphology of catalysts. The influences of electrochemical condition on the sizes and loading level of catalysts were also investigated.

scholarly journals Acid-Alkali-Treated Natural Mordenite-Supported Platinum Nanoparticles (Pt/MORn-H-OH) for Efficient Catalytic Oxidation of Formaldehyde at Room Temperature

2019 ◽  
Vol 2019 ◽  
pp. 1-5
Author(s):  
Xiaoya Gao ◽  
Qian Guo ◽  
Yuan Zhou ◽  
Dedong He ◽  
Yongming Luo
Keyword(s):  
Catalytic Activity ◽  
Catalytic Oxidation ◽  
Crystalline Phase ◽  
Room Temperature ◽  
Alkali Treatment ◽  
Pt Nanoparticles ◽  
Pt Catalysts ◽  
Step Method ◽  
Oxidation Activity ◽  
Supported Platinum

In this work, a series of natural mordenite-supported platinum (Pt) catalysts were prepared by a facile two-step method, namely, treatment of natural mordenite and then the loading of Pt nanoparticles. The acid-alkali-treated natural mordenite-supported Pt samples (1% Pt/MORn-H-OH) exhibited the highly enhanced catalytic oxidation activity of formaldehyde (HCHO) at room temperature. XRD results showed that the crystalline phase of the mordenite did not change significantly in 1% Pt/MORn-H-OH catalyst. However, the acid-alkali treatment endowed the Pt particles excellent dispersion with the smallest diameter of 2.8 nm in a high loading content, which contributed to the optimal catalytic activity of 1% Pt/MORn-H-OH.

scholarly journals Mesoporous titanium niobium nitrides supported Pt nanoparticles for highly selective and sensitive detection of formaldehyde

2021 ◽  
Author(s):  
Chaozhu Huang ◽  
Samira Adimi ◽  
Dongliang Liu ◽  
Haichuan Guo ◽  
Tiju Thomas ◽  
...  
Keyword(s):  
Proton Exchange Membrane ◽  
Gas Sensing ◽  
Pt Nanoparticles ◽  
Proton Exchange ◽  
The Poor ◽  
Supported Platinum ◽  
Commercial Carbon ◽  
Niobium Nitrides ◽  
Exchange Membrane ◽  
Gas Sensing Device

Proton exchange membrane fuel cell gas sensor is a promising and novel gas sensing device. However, the poor sensitivity and strong cross sensitivity of commercial carbon-supported-platinum (Pt/C) remain obstacles to...

scholarly journals Halotolerant bioanodes: The applied potential modulates the electrochemical characteristics, the biofilm structure and the ratio of the two dominant genera

2016 ◽  
Vol 112 ◽  
pp. 24-32 ◽  
Author(s):  
Raphaël Rousseau ◽  
Catherine Santaella ◽  
Anaïs Bonnafous ◽  
Wafa Achouak ◽  
Jean-Jacques Godon ◽  
...  
Keyword(s):  
Electrochemical Characteristics ◽  
Applied Potential ◽  
Biofilm Structure

The comparison of two classes of bifunctional SBA-15 supported platinum–heteropolyacid catalysts for the isomerization of n-hexane

2015 ◽  
Vol 39 (7) ◽  
pp. 5300-5308 ◽  
Author(s):  
Teresa Pinto ◽  
Philippe Arquillière ◽  
Gerald P. Niccolai ◽  
Frédéric Lefebvre ◽  
Véronique Dufaud
Keyword(s):  
Pt Catalysts ◽  
Supported Platinum

SBA-15 supported bifunctional acidic HSiW–Pt catalysts proved to be active, stable and highly selective in the isomerization of n-hexane.

Synthesis of indoles via dehydrogenative N-heterocyclization by supported platinum catalysts

RSC Advances ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 1059-1062 ◽  
Author(s):  
Sondomoyee Konika Moromi ◽  
Abeda Sultana Touchy ◽  
S. M. A. Hakim Siddiki ◽  
Md. Ayub Ali ◽  
Ken-ichi Shimizu
Keyword(s):  
Platinum Catalysts ◽  
Pt Catalysts ◽  
Turnover Number ◽  
Supported Platinum ◽  
Supported Platinum Catalysts

Heterogeneous Pt catalysts (Pt/Nb2O5 and Pt/HBEA) show higher turnover number (TON) than previously reported catalysts for the synthesis of indole via acceptorless dehydrogenative cyclization of 2-(2-aminophenyl)ethanol.

Tunable and selective hydrogenation of furfural to furfuryl alcohol and cyclopentanone over Pt supported on biomass-derived porous heteroatom doped carbon

2017 ◽  
Vol 202 ◽  
pp. 79-98 ◽  
Author(s):  
Xiuyun Liu ◽  
Bo Zhang ◽  
Benhua Fei ◽  
Xiufang Chen ◽  
Junyi Zhang ◽  
...  
Keyword(s):  
Furfuryl Alcohol ◽  
Value Added ◽  
Pt Nanoparticles ◽  
Carbon Support ◽  
Carbonization Temperature ◽  
High Dispersion ◽  
Pt Catalysts ◽  
Product Selectivity ◽  
Reaction Products ◽  
Hierarchical Porous

The search for and exploitation of efficient catalytic systems for selective conversion of furfural into various high value-added chemicals remains a huge challenge for green synthesis in the chemical industry. Here, novel Pt nanoparticles supported on bamboo shoot-derived porous heteroatom doped carbon materials were designed as highly active catalysts for controlled hydrogenation of furfural in aqueous media. The porous heteroatom doped carbon supported Pt catalysts were endowed with a large surface area with a hierarchical porous structure, a high content of nitrogen and oxygen functionalities, a high dispersion of the Pt nanoparticles, good water dispersibility and reaction stability. Benefiting from these features, the novel Pt catalysts displayed a high activity and controlled tunable selectivity for furfural hydrogenation to produce furfuryl alcohol and cyclopentanone in water. The product selectivity could be easily modulated by controlling the carbonization temperature of the porous heteroatom doped carbon support and the reaction conditions (temperature and H2 pressure). Under mild conditions (100 °C, 1 MPa H2), furfuryl alcohol was obtained in water with complete conversion of the furfural and an impressive furfuryl alcohol selectivity of >99% in the presence of Pt/NC-BS-500. A higher reaction temperature, in water, favored rearrangement of the furfural (FFA) with Pt/NC-BS-800 as the catalyst, which resulted in a high cyclopentanone yield of >76% at 150 °C and 3 MPa H2. The surface properties and pore structure of the heteroatom doped carbon support, adjusted using the carbonization temperature, might determine the interactions between the Pt nanoparticles, carbon support and catalytic reactants in water, which in turn could have led to a good selectivity control. The effect of different reaction temperatures and reaction times on the product selectivity was also explored. Combined with exploration of the distribution of the reaction products, a reaction mechanism for furfural reduction has been proposed.

scholarly journals Direct chemical vapor deposition of graphene on plasma-etched quartz glass combined with Pt nanoparticles as an independent transparent electrode for non-enzymatic sensing of hydrogen peroxide

RSC Advances ◽  
2020 ◽  
Vol 10 (35) ◽  
pp. 20438-20444
Author(s):  
Ning Li ◽  
Yawen Yuan ◽  
Jinglei Liu ◽  
Shifeng Hou
Keyword(s):  
Hydrogen Peroxide ◽  
Chemical Vapor Deposition ◽  
Quartz Glass ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Pt Nanoparticles ◽  
Transparent Electrode ◽  
Cvd Method ◽  
Supported Platinum ◽  
Grown Graphene

In this work, chemical vapor deposition (CVD) method-grown graphene on plasma-etched quartz glass supported platinum nanoparticles (PtNPs/eQG) was constructed as an independent transparent electrode for non-enzymatic hydrogen peroxide (H2O2) detection.

Anodic Porous Zirconium Oxide Prepared in Sulfuric Acid Electrolytes

2006 ◽  
Vol 512 ◽  
pp. 205-210 ◽  
Author(s):  
Hiroaki Tsuchiya ◽  
Jan M. Macak ◽  
Irina Sieber ◽  
Patrik Schmuki
Keyword(s):  
Sulfuric Acid ◽  
Porous Structure ◽  
Zirconium Oxide ◽  
Open Circuit Potential ◽  
Sweep Rate ◽  
Open Circuit ◽  
Potential Sweep ◽  
Self Organized ◽  
Electrochemical Condition ◽  
Ordered Porous

We report the formation of self-organized porous ZrO2 layers by anodization of Zr in H2SO4 electrolytes. Anodization at 20 V after a potential sweep from open-circuit potential with a defined sweep rate results in tube-like porous ZrO2. In particular, under optimized electrolyte condition and polarization, a highly ordered porous structure is obtained. Furthermore, sponge-like porous ZrO2 is also fabricated under a specific electrochemical condition.

The Influence of Nanoparticle Type on the Viscosity of Nanoenhanced Energy Storage Materials

2015 ◽  
Author(s):  
Kieran Hess ◽  
Amy S. Fleischer
Keyword(s):  
Phase Change ◽  
Base Fluid ◽  
Phase Change Materials ◽  
Base Material ◽  
Energy Storage Materials ◽  
Graphite Nanoplatelets ◽  
Loading Level ◽  
Graphite Nanofibers ◽  
Multi Walled Carbon Nanotubes ◽  
The Impact

The use of nanoparticles to improve the thermal properties of low thermal conductivity phase change materials is of significant interest. However, the addition of nanoparticles to a base fluid is known to result in an increase in viscosity. An increase in viscosity can suppress convective currents, reducing overall heat transfer thus it necessary to quantify the impact of nanoparticle addition on the viscosity of a PCM. In this work nanoparticle enhanced phase change mateirals are synthesized using paraffin and three different types of nanoparticles: exfoliated graphite nanoplatelets (xGNP), multi-walled carbon nanotubes (MWCNT) and herringbone graphite nanofibers (HGNF). The particles are loaded at rates between 0.0024wt% to 0.1wt%. The viscosity is analyzed at temperatures between 60 and 100°C. The influence of temperature, nanoparticle type and nanoparticle loading level on viscosity are presented and discussed. The results show that for xGNP and HGNF within the operating condition studied here that there is no impact of the nanoparticle addition on the viscosity of the base material. However, the addition of MWCNT is found to increase the viscosity of the base fluid with the impact increasing with loading level.

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