Characterization and evaluation of Pt-Ru catalyst supported on multi-walled carbon nanotubes by electrochemical impedance

Ocampo, Ana Lilia; Miranda-Hernández, M.; Morgado, José Mário; Montoya, J.A.; Sebastian, P.J.

doi:10.1016/j.jpowsour.2006.02.056

Cited by 55 publications

(29 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, diffraction peaks around 26, 42, 54°in 2ª are distinguishable signals correspond to hexagonal structure of graphite (002), (100), and (004), respectively. 26) In the present study, some of the YSZ peaks are overlapping in the same 2ª range. However, comparing the Raman and XRD result [ Figs.…”

Section: Resultssupporting

confidence: 55%

In situ zirconia/carbon network composite fabricated by gelcast following reduction-sintering

Fukumura

Pattanayak

Chen

et al. 2012

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

Here, successful fabrication of zirconia/carbon network composite by gelcast and reduction sintering in argon gas is reported. Carbon network well distributed on the grains and the boundaries is confirmed by FE-SEM, TGDTA, XRD, and, degree of graphitization by Raman spectroscopy. Electrical resistivity of 16.1 ³-cm indicates that thus formed carbon network in the zirconia matrix is expected to improve the electrical conductivity of the composite system.

show abstract

Section: Resultssupporting

confidence: 55%

In situ zirconia/carbon network composite fabricated by gelcast following reduction-sintering

Fukumura

Pattanayak

Chen

et al. 2012

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

show abstract

“…0.53 for CPE 1 and CPE 2 , respectively meaning pseudocapacitive behavior. CPE 2 is associated with the CO ads oxidation [9]. From the Bode plots (i.e., À phase angle (q/8) vs. log f (Hz), Figure 7, the phase angles of EG, MeOH and FA for the forward and reverse potentials are~75 o , < 708 and !À 858 respectively, confirming the presence of CPE and pseudocapacitive nature of the electrodes since the angles are less than the À 908 expected for an ideal capacitive behavior.…”

Section: Impedance Spectroscopy Measurementsmentioning

confidence: 97%

Dynamics of Electrocatalytic Oxidation of Ethylene Glycol, Methanol and Formic Acid at MWCNT Platform Electrochemically Modified with Pt/Ru Nanoparticles

2010

View full text Add to dashboard Cite

Comparative electrocatalytic behavior of functionalized multiwalled carbon nanotubes (fMWCNTs) electrodecorated with Pt/Ru nanoparticles towards the oxidation of methanol (MeOH), ethylene glycol (EG) and formic acid (FA) has been investigated. The catalytic current density decreased approximately as MeOH % EG > FA. Result revealed that BPPGE-fMWCNT-Pt/Ru tolerates CO poisoning for FA electrooxidation than when used for the oxidation of the EG or MeOH. Electrochemical impedance spectra are dependent on the oxidation potentials, with equivalent circuit models characteristic of adsorption-controlled charge transfer kinetics. The results provide important insights into the electrochemical response of these small organic molecules useful in fuel cell technology.

show abstract

“…The shape of the Pt oxidation peak on the carbon support is also more symmetric. 8 It is noteworthy that the oxidation peak in Fig. 3d is less asymmetric than the peaks in the voltammograms of Fig.…”

Section: K110mentioning

confidence: 84%

“…In this context, CO stripping and methanol oxidation appear to be very sensitive to the activity of the catalyst ͑bifunctional mechanism or ligand effect͒. [7][8][9] Therefore, the study of catalyst loading on CNTs probed by CO stripping and methanol oxidation are important techniques for detection of the possible presence of electronic interactions between the catalyst and carbon support.…”

mentioning

confidence: 99%

Electrochemical Evidence of Strong Electronic Interaction of PtRu on Carbon Nanotubes with High Density of Defects

Moraes

Matsubara

Rosolen

2008

Electrochem. Solid-State Lett.

View full text Add to dashboard Cite

We show that carbon nanotubes ͑CNTs͒ with high density of defects can present a strong electronic interaction with nanoparticles of Pt-Ru with average particle size of 3.5 Ϯ 0.8 nm. Depending on the Pt-Ru loading on the CNTs, CO and methanol oxidation reactions suggest there is a charge transfer between Pt-Ru that in turn provokes a decrease in the electronic interaction taking place between Ru and Pt in the PtRu alloy. The CO stripping potentials were observed at about 0.65 and 0.5 V for Pt-Ru/CNT electrodes with Pt-Ru loadings of 10 and 20, and 30 wt %, respectively.

show abstract

Characterization and evaluation of Pt-Ru catalyst supported on multi-walled carbon nanotubes by electrochemical impedance

Cited by 55 publications

References 56 publications

In situ zirconia/carbon network composite fabricated by gelcast following reduction-sintering

In situ zirconia/carbon network composite fabricated by gelcast following reduction-sintering

Dynamics of Electrocatalytic Oxidation of Ethylene Glycol, Methanol and Formic Acid at MWCNT Platform Electrochemically Modified with Pt/Ru Nanoparticles

Electrochemical Evidence of Strong Electronic Interaction of PtRu on Carbon Nanotubes with High Density of Defects

Contact Info

Product

Resources

About