Glycerol electro-oxidation over glassy-carbon-supported Au nanoparticles: direct influence of the carbon support on the electrode catalytic activity

2013 ◽  
Vol 15 (25) ◽  
pp. 10339 ◽  
Author(s):  
Janaina F. Gomes ◽  
Luiz H. S. Gasparotto ◽  
Germano Tremiliosi-Filho
Keyword(s):  
Catalytic Activity ◽  
Glassy Carbon ◽  
Au Nanoparticles ◽  
Carbon Support ◽  
Direct Influence ◽  
Electro Oxidation

Carbon-Supported Au Nanoparticles: Catalytic Activity Ruled Out by Carbon Support

2018 ◽  
Vol 61 (18-19) ◽  
pp. 1928-1938 ◽  
Author(s):  
Andrea Jouve ◽  
Marta Stucchi ◽  
Ilaria Barlocco ◽  
Claudio Evangelisti ◽  
Ferenc Somodic ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Au Nanoparticles ◽  
Carbon Support

scholarly journals Development of palladium catalysts modified by ruthenium and molybdenum as anode in direct ethanol fuel cell

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Yonis Fornazier Filho ◽  
Ana Caroliny Carvalho da Cruz ◽  
Rolando Pedicini ◽  
José Ricardo Cezar Salgado ◽  
Priscilla Paiva Luz ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Palladium Catalysts ◽  
Carbon Support ◽  
X Ray Diffraction ◽  
Direct Ethanol Fuel Cell ◽  
Pd Catalysts ◽  
Bifunctional Mechanism ◽  
Catalytic Activities ◽  
Intrinsic Mechanism ◽  
Ternary Catalysts

AbstractPhysical and electrochemical properties of Pd catalysts combined with Ru and Mo on carbon support were investigated. To this end, Pd, Pd1.3Ru1.0, Pd3.2Ru1.3Mo1.0 and Pd1.5Ru0.8Mo1.0 were synthesized on Carbon Vulcan XC72 support by the method of thermal decomposition of polymeric precursors and then physically and electrochemically characterized. The highest reaction yields are obtained for Pd3.2Ru1.3Mo1.0/C and Pd1.5Ru0.8Mo1.0/C and, as demonstrated by thermal analysis, they also show the smallest metal/carbon ratio compared the other catalysts. XRD (X-ray Diffraction) and Raman analyses show the presence of PdO and RuO2 for the Pd/C and the Pd1.3Ru1.0/C catalysts, respectively, a fact not observed for the Pd3.2Ru1.3 Mo1.0 /C and the Pd1.5Ru0.8Mo1.0/C catalysts. The catalytic activities were tested for the ethanol oxidation in alkaline medium. Cyclic voltammetry (CV) shows Pd1.3Ru1.0/C exhibiting the highest peak of current density, followed by Pd3.2Ru1.3Mo1.0/C, Pd1.5Ru0.8Mo1.0/C and Pd/C. From, chronoamperometry (CA), it is possible to observe the lowest rate of poisoning for the Pd1.3Ru1.0/C, followed by Pd3.2Ru1.3Mo1.0/C, Pd1.5Ru0.8Mo1.0/C and Pd/C. These results suggested that catalytic activity of the binary and the ternary catalysts are improved in comparison with Pd/C. The presence of RuO2 activated the bifunctional mechanism and improved the catalytic activity in the Pd1.3Ru1.0/C catalyst. The addition of Mo in the catalysts enhanced the catalytic activity by the intrinsic mechanism, suggesting a synergistic effect between metals. In summary, we suggest that it is possible to synthesize ternary PdRuMo catalysts supported on Carbon Vulcan XC72, resulting in materials with lower poisoning rates and lower costs than Pd/C. Graphic abstract

Electrocatalytic activity of carbon-supported Pt–Au nanoparticles for methanol electro-oxidation

2007 ◽  
Vol 52 (18) ◽  
pp. 5599-5605 ◽  
Author(s):  
In-Su Park ◽  
Kug-Seung Lee ◽  
Dae-Sik Jung ◽  
Hee-Young Park ◽  
Yung-Eun Sung
Keyword(s):  
Electrocatalytic Activity ◽  
Au Nanoparticles ◽  
Electro Oxidation

ELECTRO-OXIDATION OF ETHANOL ON NANOCRYSTALLINE Pd/C CATALYST PROMOTED WITH OXIDE IN ALKALINE MEDIA

2009 ◽  
Vol 08 (01n02) ◽  
pp. 203-207 ◽  
Author(s):  
J. L. LU ◽  
CHANGWEI XU ◽  
SAN PING JIANG
Keyword(s):  
High Surface ◽  
Carbon Support ◽  
Alkaline Media ◽  
Particle Sizes ◽  
Linear Sweep ◽  
Direct Ethanol Fuel Cells ◽  
Oxidation Activity ◽  
Microstructure Change ◽  
Electro Oxidation ◽  
Oxidation Of Ethanol

Nanocrystalline Pd electrocatalyst promoted with transition metal oxide ( Co 3 O 4, NiO , and CoNiO x) is successfully synthesized on high surface carbon support by using intermittent microwave heating (IMH) method. The physical properties of the catalysts are characterized by XRD, TEM, and EDX. The results show that there is no significant microstructure change between Pd and Pd -oxide electrocatalysts and the particle sizes are in the range 5.8–3.9 nm. The linear sweep voltammogram and chronoamperometry results for the electro-oxidation of ethanol show that Pd -oxide/ C electrocatalysts exhibit much better electrochemical activity and stability as compared with pure Pd / C electrocatalyst. The results show that Pd – CoNiO x/ C exhibits the best stability and highest electro-oxidation activity, indicating the promising potential as an alternative electrocatalysts for the direct ethanol fuel cells.

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