Efficient usage of highly dispersed Pt on carbon nanotubes for electrode catalysts of polymer electrolyte fuel cells

Matsumoto, Tetsuya; Komatsu, Tatsuya; Nakano, Hiroyuki; Arai, Kazuya; Nagashima, Yoshiaki; Yoo, Eunjoo; Yamazaki, Takahisa; Kijima, Masashi; Shimizu, Harukazu; Takasawa, Yosuke; Nakamura, Junji

doi:10.1016/j.cattod.2004.04.038

Cited by 193 publications

(113 citation statements)

References 21 publications

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“…The ultrasound-assisted impregnation method was used to anchor metal particles on activated carbon surface because of its simplicity and its large scale [35][36][37][38]. Deionized water was used as dissolving media for both nickel acetate and platinum chloride while ultra-high purity benzene was used for dissolving palladium acetate.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

et al. 2015

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Activated carbon has been synthesized from local palm shell, cardboard and plastics municipal waste in the Kingdom of Saudi Arabia. It exhibits a surface area of 930 m 2 /g and total pore volume of 0.42 cm 3 /g. This pristine activated carbon has been further anchored with nickel, palladium and platinum metal particles by ultrasound-assisted impregnation. Deposition of nanosized Pt particles as small as 3 nm has been achieved, while for Ni and Pd their size reaches 100 nm. The solid-gas hydrogenation properties of the pristine and metal-anchored activated carbon have been determined. The pristine material exhibits a reversible hydrogen storage capacity of 2.3 wt% at 77 K and 3 MPa which is higher than for the doped ones. In these materials, the spillover effect due to metal doping is of minor importance in enhancing the hydrogen uptake compared with the counter-effect of the additional mass of the metal particles and pore blocking on the carbon surface. OPEN ACCESS

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Section: Methodsmentioning

confidence: 99%

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

et al. 2015

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“…In recent years, carbon materials such as carbon nanotubes (CNTs), carbon nanofibers and mechanically milled graphites have attracted attention owing to the availability of new carbon materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. However, most studies concerning the hydrogen storage have been carried out at high pressures (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) and low temperatures (80-133 K) in order to store molecular hydrogen by physisorption. It has been often reported that hydrogen storage by physisorption remains less than 4 wt% at room temperature and even high pressures [1,2].…”

Section: Introductionmentioning

confidence: 99%

Possibilities of atomic hydrogen storage by carbon nanotubes or graphite materials

Yoo

Habe

Nakamura³

2005

Science and Technology of Advanced Materials

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Atomic hydrogen storage by carbon nanotubes (CNTs) and highly oriented pyrolytic graphite (HOPG) has been studied using a flow catalytic reactor and an ultra-high vacuum surface science apparatus including scanning tunneling microscope (STM), respectively. Defect sites on CNTs as adsorption sites of atomic hydrogen are introduced by oxidation pretreatment using La catalyst. Pd catalysts are then deposited on CNT surfaces for dissociation of H 2 into atomic hydrogen, which spills over to the defect sites. In the best case, 1.5 wt% of hydrogen is stored in the defective CNT with Pd particles at 1 atm and 573 K. In temperature programmed desorption (TPD) experiments, H 2 starts to desorb at 700-900 K depending on the annealing temperatures of CNTs prior to hydrogen storage. On the HOPG surface, hot atomic hydrogen produced by dissociation of H 2 using tungsten wire desorbs from graphite terraces at 400-700 K, which is much lower than that on CNTs. It is possible that one can decrease the desorption temperature by changing the method of H 2 dissociation. q

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“…In particular their morphology suggests their use as support for liquid phase reactions as benzyl alcohol oxidation [10] and cinnamaldehyde hydrogenation [11,12]. On the contrary to activated carbons where there are many inaccessible active sites, CNTs are advantageous substrate since most of the metal nanoparticles are expected to be exposed and accessible to reactant thus acting as effective catalysts [13]. However due to the inertness of the pristine CNTs a selective metal deposition requires activation [14].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen functionalized carbon nanostructures supported Pd and Au–Pd NPs as catalyst for alcohols oxidation

et al. 2010

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Two different carbon nanotubes (CNTs) PR24-PS and Baytubes were functionalized by oxidation with nitric acid and further amination with gaseous NH3. Thus Au and Au-Pd nanoparticles were prepared by PVA/NaBH4 system and anchored on the surface of pristine CNTs and NCNTs (Nitrogen functionalized carbon nanotubes). TEM analysis revealed that the introduction of nitrogen functionalities improves the dispersion of the metal nanoparticles on the surface of the support. This phenomena leads to an improved activity of N-CNTs based catalysts with the respect of pristine CNTs when tested in the liquid phase oxidation of alcohols.

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Efficient usage of highly dispersed Pt on carbon nanotubes for electrode catalysts of polymer electrolyte fuel cells

Cited by 193 publications

References 21 publications

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

Hydrogen Storage in Pristine and d10-Block Metal-Anchored Activated Carbon Made from Local Wastes

Possibilities of atomic hydrogen storage by carbon nanotubes or graphite materials

Nitrogen functionalized carbon nanostructures supported Pd and Au–Pd NPs as catalyst for alcohols oxidation

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