The H2/O2 Reaction on a Palladium Model Catalyst Studied with Laser-Induced Fluorescence and Microcalorimetry

Johansson, Åsa; Rosén, Arne

doi:10.3390/i2050221

Cited by 12 publications

(5 citation statements)

References 18 publications

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“…The obtained apparent activation energies for three different reactant concentrations are in excellent agreement with the literature. 20,21 The above results show that with INPS we have created an optical nanocalorimetry tool to follow exothermic reactions on small amounts of catalytically active nanoparticles. As a further illustration of its capacity, we investigated the Pd nanoparticle size-dependence of the catalytic activity for the hydrogen oxidation reaction at R ) 0.35.…”

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confidence: 80%

“…To quantify these measurements and demonstrate the direct correlation between measured LSPR shift and local catalyst temperature, an Arrhenius analysis of the low-temperature (below light-off and the kinetic phase transition) regime is shown in Figure e. The obtained apparent activation energies for three different reactant concentrations are in excellent agreement with the literature. , …”

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confidence: 99%

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Indirect Nanoplasmonic Sensing: Ultrasensitive Experimental Platform for Nanomaterials Science and Optical Nanocalorimetry

et al. 2010

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Indirect nanoplasmonic sensing is a novel experimental platform for measurements of thermodynamics and kinetics in/on nanomaterials and thin films. It features simple experimental setup, high sensitivity, small sample amounts, high temporal resolution (<10(-3) s), operating conditions from UHV to high pressure, wide temperature range, and applicability to any nano- or thin film material. The method utilizes two-dimensional arrangements of nanoplasmonic Au sensor-nanoparticles coated with a thin dielectric spacer layer onto which the sample material is deposited. The measured signal is spectral shifts of the Au-sensor localized plasmons, induced by processes in/on the sample material. Here, the method is applied to three systems exhibiting nanosize effects, (i) the glass transition of confined polymers, (ii) catalytic light-off on Pd nanocatalysts, and (iii) thermodynamics and kinetics of hydrogen uptake/release in Pd nanoparticles <5 nm. In (i) and (iii), dielectric changes in the sample are detected, while (ii) demonstrates a novel optical nanocalorimetry method.

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Indirect Nanoplasmonic Sensing: Ultrasensitive Experimental Platform for Nanomaterials Science and Optical Nanocalorimetry

et al. 2010

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“…In other words, the number of adsorption sites in the porous layer is more than that in the same volume of the non-porous sample. This means that if we define the sticking probability as the adsorption rate divided by the collision rate [24], the sticking probability in the porous sample is increased proportionally to W . This is much higher on more open or rough surfaces than on smooth surfaces.…”

Section: Analytical Discussion Of Experimental Resultsmentioning

confidence: 99%

Experimental verification of theoretical analysis of Pd/porous-GaAs as a hydrogen sensor

Nikfarjam¹,

Kalantari²

2008

J. Phys. D: Appl. Phys.

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The Pd/porous GaAs Schottky sensor reveals high potential for hydrogen detection at room temperature (Salehi et al 2006 Sensors Actuators B 113 419–27). The Pd/porous GaAs Schottky sensor fabricated in this study exhibited a considerable increase in sensitivity three times that of the non-porous sensor submitted to 500 ppm hydrogen gas at room temperature. The theoretical analysis presented here proves that the sensitivity of the porous sample should be more than that in the non-porous sample and this higher sensitivity refers to more hydrogen adsorption at the interface of the contact. The increased sensitivity coefficient in the porous sensor is related to the morphology of the surface and is a function of two parameters: increase in surface area and density of cavities between pore walls (number of pores which is important in catalyzers). We believe that porosity, in addition to increased surface area and adsorption site, causes an additional increase in sensitivity. Moreover, the response time of the sensors was modelled for non-porous and porous samples exposed to hydrogen gas. As analytical predictions were experimentally verified, the porous sample exhibited a rise time comparable to the non-porous sample but in spite of a low rise time the recovery time of the porous sample is much larger (about four times) than that of the non-porous sample.

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“…36 As the final step for the analysis presented here (for further details, we refer to the original paper 1 ), an Arrhenius analysis of the low-temperature (below light-off) regime is shown in Figure 6c. The obtained apparent activation energies for three different reactant concentrations are in excellent agreement with the literature 37,38 and demonstrate the potential of nanoplasmonic sensing in general and of INPS in particular as an optical nanocalorimetry tool in catalysis.…”

Section: Inps-based Local Temperature Readout Formentioning

confidence: 99%

Nanoplasmonic In Situ Spectroscopy for Catalysis Applications

Langhammer¹,

Larsson

2012

ACS Catal.

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The H2/O2 Reaction on a Palladium Model Catalyst Studied with Laser-Induced Fluorescence and Microcalorimetry

Cited by 12 publications

References 18 publications

Indirect Nanoplasmonic Sensing: Ultrasensitive Experimental Platform for Nanomaterials Science and Optical Nanocalorimetry

Indirect Nanoplasmonic Sensing: Ultrasensitive Experimental Platform for Nanomaterials Science and Optical Nanocalorimetry

Experimental verification of theoretical analysis of Pd/porous-GaAs as a hydrogen sensor

Nanoplasmonic In Situ Spectroscopy for Catalysis Applications

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