Controlled platinum nanoparticles uniformly dispersed on nitrogen-doped carbon nanotubes for methanol oxidation

Du, He-Yun; Wang, Chenhao; Hsu, He-Hong; Chang, Shinn‐Jen; Chen, U.-S.; Yen, Shih-Chieh; Chen, L.C.; Shih, Han C.; Chen, K.H.

doi:10.1016/j.diamond.2008.01.116

Cited by 76 publications

(50 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nitrogen introduction into the carbon structure opens up a good possibility to regulate the surface and electronic properties of carbon nanotubes, carbon nanofibers (CNFs) or graphene [9][10][11][12][13]. By now, a sufficient experimental material has been accumulated, making it possible to conclude that the use of nitrogen-doped carbon nanomaterials as metal catalyst supports increases the catalytic activity in electrochemical oxidation of methanol or hydrogen in fuel cells [14][15][16][17][18], selective hydrogenation of cinnamaldehyde [19,20], ammonia decomposition [21], isotope exchange [22], and CO oxidation [23]. The increase in catalytic activity is associated with several basic factors: (1) introducing a heteroatom into carbon material makes it possible to control the size of the supported metal particles and to obtain a narrower particle size distribution; (2) using a support of higher conductivity leads to enhanced chemical reactivity for electron transfer processes in a catalytic system; (3) there occur changes in the acid-base properties of the support surface.…”

Section: Introductionmentioning

confidence: 99%

Ruthenium nanoparticles supported on nitrogen-doped carbon nanofibers for the catalytic wet air oxidation of phenol

Ayusheev

Taran

Seryak

et al. 2014

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Ruthenium nanoparticles supported on nitrogen-doped carbon nanofibers for the catalytic wet air oxidation of phenol

Ayusheev

Taran

Seryak

et al. 2014

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

“…1 The morphologic effects of Pt nanoparticles, films, and alloys on the oxygen reduction reaction were reported. 1,21 In contrast that the Pt nanoparticles have been formed on various types of controlled C materials, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] the electric contact of Pt with C has never been controlled and monitored nanoscopically.…”

Section: Introductionmentioning

confidence: 99%

“…2 Pt nanoparticles on C nanofibers (mean Pt size of 1.7-4 nm), 3,4 C nanotubes (mean Pt size of 2-6.7 nm), [4][5][6][7][8][9][10] ordered mesoporous C (mean Pt size of 1.5-3 nm), [11][12][13] C powder (mean Pt size of 1.6-4.8 nm), [14][15][16][17] and spherical C (mean Pt size of 2.9 nm) 18 and Pt monolayer on nanoparticles of other metals 19 have been synthesized in narrow particle size distribution.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Site Structure of a Replica Platinum−Carbon Composite Formed Utilizing Ordered Mesopores of Aluminum-MCM-41 for Catalysis in Fuel Cells

et al. 2009

View full text Add to dashboard Cite

Platinum nanoparticles have been reported with mean sizes between 1.5 and 7 nm supported on carbon. The contact between Pt nanoparticles and C has never been controlled and monitored nanoscopically. In this paper, stable Pt nanoparticles with a mean size of 1.2 nm were synthesized embedded on/in a C matrix catalytically produced from acetylene over the Pt nanoparticles. The replica Pt-C composite was synthesized inside of the ordered mesopores (2.7 nm) of Al-MCM-41 followed by removal of the template. The contact between the Pt nanoparticle and C was experimentally observed by high-energy resolution Pt L 2 -edge XANES spectra tuned to 11065.7 eV, at a lower energy by 5 eV than the Pt L 1 peak top for the replica Pt-C pressed to electrolyte polymer (Nafion). The spectra were nicely reproduced in a theoretical spectrum using ab initio multiple scattering calculations for the interface Pt site between cuboctahedral Pt 38 and graphite layers. Other Pt sites detected in state-selective Pt L 2 -edge XANES were exclusively metallic for replica Pt-C/Nafion either in air or in H 2 . The thus-characterized replica Pt-C composite was tentatively tested as a cathode of a H 2 -air polymer electrolyte fuel cell in comparison to commercial 20 wt % Pt/Vulcan XC-72 as the cathode. The improvement of Pt dispersion stabilized on/in a C matrix, effective contact of Pt with C, and diffusion of O 2 in a few nanometers of replica Pt-C powder was suggested.

show abstract

“…The mean particle zeta potential changed from -18 mV for freshly prepared Pt-Rh binary catalyst to 16 mV for completely reacted Pt-Rh binary Intensity (%) Hung et al, Aerosol and Air Quality Research, 12: 583-591, 2012 589 catalyst. The weak electrostatic repulsion of the solid particle surface charge and the tendency of the particles to flocculate after catalytic reaction, as shown by Du et al (2008), might be significant causes explaining the phenomena that occurred in this experiment. Obviously, this explanation is consistent with the previous observation of the catalyst particle size (Fig.…”

Section: Resultsmentioning

confidence: 91%

Removal of Gaseous Ammonia in Pt-Rh Binary Catalytic Oxidation

Dong

Lai

Lin

2012

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

In this study, the oxidation of ammonia (NH 3 ) to form nitrogen was investigated by selective catalytic oxidation (SCO) over a Pt-Rh binary catalyst fabricated by the incipient wetness impregnation process in a tubular fixed-bed flow quartz reactor (TFBR). The catalysts were analysed by three-dimensional excitation-emission fluorescent matrix (EEFM) spectroscopy, UV-Vis absorption, dynamic light-scattering (DLS), zeta potential measurements, and linear sweep voltammograms (LSV). At optimum conditions, namely, a temperature of 673 K and an oxygen content of 4%, nearly 100% of the NH 3 was removed by catalytic oxidation over the Pt-Rh binary catalyst. The main product of the NH 3 -SCO process was N 2 . Additionally, for the freshly prepared Pt-Rh binary catalyst, three peaks (at 235/295 nm, 245/315 nm, and 240/365 nm) were observed via EEFM; however, the peak with the highest emission wavelength disappeared over time as Pt-Rh binary catalyst was exhausted by NH 3 . These results show that EEFM spectroscopy, which enhances intrinsic emission Pt clusters in the Pt-Rh binary catalyst, is an effective method for characterizing this catalyst in catalytic treatment systems. The UV-Vis absorption spectra revealed that the bands associated with such octahedral platinum (IV) species were observed at about 350 nm. Moreover, the LSV reversible redox ability may explain the significant activity of the catalysts.

show abstract

Controlled platinum nanoparticles uniformly dispersed on nitrogen-doped carbon nanotubes for methanol oxidation

Cited by 76 publications

References 28 publications

Ruthenium nanoparticles supported on nitrogen-doped carbon nanofibers for the catalytic wet air oxidation of phenol

Ruthenium nanoparticles supported on nitrogen-doped carbon nanofibers for the catalytic wet air oxidation of phenol

Synthesis and Site Structure of a Replica Platinum−Carbon Composite Formed Utilizing Ordered Mesopores of Aluminum-MCM-41 for Catalysis in Fuel Cells

Removal of Gaseous Ammonia in Pt-Rh Binary Catalytic Oxidation

Contact Info

Product

Resources

About