A generic model for photocatalytic activity as a function of catalyst thickness

Nielsen, Morten Godtfred; In, Su‐Il; Vesborg, Peter Christian Kjærgaard; Pedersen, Thomas; Almtoft, Klaus Pagh; Andersen, Inge Hald; Hansen, Ole; Chorkendorff, Ib

doi:10.1016/j.jcat.2012.01.015

Cited by 26 publications

(41 citation statements)

References 30 publications

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“…There are various techniques for synthesizing TiO 2 coatings [3]. Among, and the most common methods are chemical solution deposition (CSD, Sol gel) [18] , [19] and physical vapour deposition (PVD) [20] , [21]. PVD is known to produce compact coatings with good adhesion to the substrate and the processing parameters, such as temperature and pressure, are controlled precisely and hence provide good reproducibility.…”

Section: Page 4 Of 26mentioning

confidence: 99%

Investigation of DC magnetron-sputtered TiO2 coatings: Effect of coating thickness, structure, and morphology on photocatalytic activity

Davíđsdóttir

Shabadi

Gâlcă

et al. 2014

Applied Surface Science

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The photocatalytic performance of magnetron-sputtered titanium dioxide (TiO 2 ) coatings of different thickness in anatase crystalline structure deposited on aluminium 1050 alloy substrates was investigated using a combination of photo-electrochemistry, methylene blue decomposition, and microscopic and spectroscopic methods, such as high resolution scanning and transmission electron microscopy, atomic force microscopy and ellipsometry. The reaction resistance was measured by AC impedance, while photocurrent measurements were carried out using the zero resistance ammetry (ZRA) method. The results showed that the A c c e p t e d M a n u s c r i p t 2 increased with increased coating thickness, though more rapidly over a range of 100 -500 nm thickness. The dielectric constant also increased linearly with coating thickness

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Section: Page 4 Of 26mentioning

confidence: 99%

Investigation of DC magnetron-sputtered TiO2 coatings: Effect of coating thickness, structure, and morphology on photocatalytic activity

Davíđsdóttir

Shabadi

Gâlcă

et al. 2014

Applied Surface Science

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“…Solutions for the steady-state electron (or hole) concentration profile, and the spectral quantum efficiency (incident photon to collected electron -efficiency, IPCE) has been derived this way for situations when the incident light is monochromatic 64,68,69 . One of the most typical applications of these analytical models has been the investigation of the effects of photoelectrode thickness on the photocurrent yield 17,18,60,62 .…”

Section: Simplified Light Absorption Modeling Based On Beer -Lambert Lawmentioning

confidence: 99%

Physical Modeling of Photoelectrochemical Hydrogen Production Devices

2015

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Solar-powered water splitting with photoelectrochemical (PEC) devices is a promising method to simultaneously harvest and store solar energy at a large scale. Highly efficient small prototype PEC devices reported recently demonstrate a move from basic material research towards design and engineering of complete devices and systems. The increased interest in engineering calls for better understanding about the operational details of PEC devices at different length scales. The relevant physical phenomena and the properties of typical materials are well known for separate device components, but their interaction in a complete PEC cell has received less attention. Coupled physical models are useful for studying these interactions and understanding the device operation as a whole, and for optimizing the devices. We review the central physical processes in solar-powered water splitting cells and the physical models used in their theoretical simulations. Our focus is in particular on how different physical processes have been coupled together to construct device models, and how different electrode and device geometries have been taken into account in them. Reflecting on the literature we discuss future opportunities and challenges in the modeling of PEC cells.3

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“…1 A terminal activity is reached asymptotically with photocatalyst thickness for frontside illumination, but the conversion rate per catalyst mass goes towards zero for increasing catalyst thickness [7]. 2 Ethene, formaldehyde and toluene have solubilities in water of 130 mg L À1 , 400 g L À1 and 520 mg L À1 , respectively [12].…”

Section: Light Sourcementioning

confidence: 99%

“…An explanation could be that anatase and rutile phases of the TiO 2 nanoparticles are affected differently by the presence of water, or that two different sites are responsible for the observed activity -ethene adsorbing on the surface and being oxidized directly, by neighboring hydroxyl radicals, or even by direct contact with hydroxyl radicals without surface adsorption. 6 The latter is known to be an approximation as the exponent in light intensity has been observed to be between 0.7 and 0.84 [7,15]. This has the consequence that it is beneficial activity-wise to have large photocatalyst area and low light intensity, rather than small area and high light intensity.…”

Section: Photooxidation Ratementioning

confidence: 99%

“…The flow is in the figure ramped from 2 to 12 L min À1 in steps of 2 L min À1 , and the signal stabilization time is adjusted according to the flow value. 7 7 Due to the 3 min between each sampling of the GC, the number of measurement points would at high flow values be critically low, introducing high statistical uncertainties. Therefore a minimum stabilization time of 18 min was ensured (6 GC samplings).…”

Section: Flow Ramping Experimentsmentioning

confidence: 99%

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