Interaction between Pt nanoparticles and carbon nanotubes – An X-ray absorption near edge structures (XANES) study

Zhou, Jigang; Zhou, Xingtai; Sun, Xuhui; Li, Ruying; Murphy, Michael W.; Ding, Zhifeng; Sun, Xueliang; Sham, Tsun‐Kong

doi:10.1016/j.cplett.2007.02.026

Cited by 102 publications

(88 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 6b. The decrease in ECSA is believed to be due to platinum agglomeration and dissolution as a result of substrate corrosion (68). As the substrate undergoes corrosion, Pt nanoparticles will start agglomerating which will lead to their detachment from the support and consequently decrease in ECSA.…”

Section: Resultsmentioning

confidence: 99%

Graphitic Carbon Nitride Materials for Energy Applications

et al. 2015

View full text Add to dashboard Cite

Polymeric layered carbon nitrides were investigated for use as catalyst support materials for proton exchange membrane fuel cells (PEMFCs) and water electrolyzers (PEMWEs). Three different carbon nitride materials were prepared: a heptazine-based graphitic carbon nitride material (gCNM), poly (triazine) imide carbon nitride intercalated with LiCl component (PTI-Li+Cl-) and boron-doped graphitic carbon nitride (B-gCNM). Following accelerated corrosion testing, all graphitic carbon nitride materials were found to be more electrochemically stable compared to conventional carbon black (Vulcan XC-72R) with B-gCNM support showing the best stability. For the supported Pt, Pt/PTI-Li+Cl- exhibited the best durability with only 19% electrochemical surface area (ECSA) loss versus 36% for Pt/Vulcan. Superior methanol oxidation activity was observed for all gCNM supported Pt catalysts on the basis of the catalyst ECSA. Preliminary results on IrO2 supported on gCNM using a PEMWE cell revealed an enhancement in the charge-transfer resistance as the current density increases when compared to unsupported IrO2. This may be attributed to a higher active surface area of the catalyst nanoparticles on the gCNM support.

show abstract

Section: Resultsmentioning

confidence: 99%

Graphitic Carbon Nitride Materials for Energy Applications

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The price of membranes can be greatly reduced by large scale production as the fuel cells are commercially produced for widespread use. Yet, this cost improvement with large scale production cannot be realized for electrocatalysts [20][21][22]. The low temperature fuel cells operate under strongly acidic conditions (pH < 2) originating from the mobility of protons.…”

Section: Introductionmentioning

confidence: 99%

Transition Metal Carbides and Nitrides as Electrode Materials for Low Temperature Fuel Cells

2009

View full text Add to dashboard Cite

Transition metal carbides (TMCs) and transition metal nitrides (TMNs) have attracted attention as promising electrocatalysts that could replace noble metals of high price and limited supply. Relative to parent metals, TMC and TMN behave like noble metals for electrochemical reactions such as oxidation of hydrogen, CO and alcohols, and reduction of oxygen. When TMC and TMN are combined with other metals, the electrocatalytic synergy is often observed in electrochemical reactions. Thus, combinations with a minute amount of Pt or even non-Pt metals give performance comparable to heavily loaded Pt-based electrocatalysts for low temperature fuel cells. It appears that TMC based electrocatalysts are more active as anode catalysts for oxidation of fuels, whereas TMN based catalysts are more active for cathode catalysts for oxygen reduction and more stable.

show abstract

“…19−21 This is directly related to the interaction between the catalysts and their supports. 19,20 Furthermore it has been reported that the morphology and shape of Pt nanostructures influences the ORR activity of the electrocatalyst. 22,23 The Pt nanostructure morphology in turn is closely related to the deposition process and the substrate.…”

Section: ■ Introductionmentioning

confidence: 99%

TiSi₂O_x Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

et al. 2013

Self Cite

View full text Add to dashboard Cite

Composite nanostrucutres of TiSi 2 O x coated nitrogen-doped carbon nanotubes (NCNTs) were synthesized by a combination of chemical vapor deposition (CVD) and magnetron sputtering processes. The synthesized nanostructures were used as supports for Pt catalyst for oxygen reduction reaction (ORR) in proton exchange memberane fuel cells (PEMFCs). An amorphous layer of TiSi 2 O x with controlled thicknesses was sputtered on NCNTs and followed by post-treatment at high temperature (1000°C, An-TiSi 2 O x -NCNTs), inducing TiO 2 nanoparticles of around 5 nm in diameter embedded in the amorphous layer. Further analyses via X-ray absorption spectroscopy of the Ti K edge and Si K edge revealed the Ti atoms were in a TiO 2 rutile environment and the Si atoms were in a SiO 2 environment. Pt nanoparticles with an average diameter of 3 nm were deposited on the composite support, and their electrochemical behaviors toward ORR were studied. It was revealed that, even with lower electrochemical surface area (ECSA), Pt/An-TiSi 2 O x -NCNTs showed better catalytic activity toward ORR than Pt/NCNT catalysts. The origin of enhanced activity of Pt/An-TiSi 2 O x -NCNTs was examined by high resolution transmission electron microscopy (HRTEM) and the X-ray absorption near edge structure spectra (XANES) of the deposited Pt nanoparticles.

show abstract

Interaction between Pt nanoparticles and carbon nanotubes – An X-ray absorption near edge structures (XANES) study

Cited by 102 publications

References 26 publications

Graphitic Carbon Nitride Materials for Energy Applications

Graphitic Carbon Nitride Materials for Energy Applications

Transition Metal Carbides and Nitrides as Electrode Materials for Low Temperature Fuel Cells

TiSi₂O_x Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

Contact Info

Product

Resources

About

Interaction between Pt nanoparticles and carbon nanotubes – An X-ray absorption near edge structures (XANES) study

Cited by 102 publications

References 26 publications

Graphitic Carbon Nitride Materials for Energy Applications

Graphitic Carbon Nitride Materials for Energy Applications

Transition Metal Carbides and Nitrides as Electrode Materials for Low Temperature Fuel Cells

TiSi2Ox Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

Contact Info

Product

Resources

About

TiSi₂O_x Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs