Electronic Spectroscopy: Ultra Violet‐Visible and near IR Spectroscopies

Jentoft, Friederike C.

doi:10.1002/9783527645329.ch3

Cited by 10 publications

(2 citation statements)

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“…Not all these techniques are used during catalyst characterization due to the specificity and nature of sample environment of each, but usually, a number of the techniques are combined to gather as much data to support the characterization. − However, most of these characterization techniques are typically not conducted under true reaction conditions, and some of the techniques are even the subject of debate concerning the information obtained and whether it can be transferred to real life catalysts under real working conditions. , …”

Section: Traditional Approaches To Catalyst Kinetic and Physical Char...mentioning

confidence: 99%

Evolution and Enabling Capabilities of Spatially Resolved Techniques for the Characterization of Heterogeneously Catalyzed Reactions

et al. 2016

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The development and optimization of catalysts and catalytic processes requires knowledge of reaction kinetics and mechanisms. In traditional catalyst kinetic characterization, the gas composition is known at the inlet, and the exit flow is measured to determine changes in concentration. As such, the progression of the chemistry within the catalyst is not known. Technological advances in electromagnetic and physical probes have made visualizing the evolution of the chemistry within catalyst samples a reality, as part of a methodology commonly known as spatial resolution. Herein, we discuss and evaluate the development of spatially resolved techniques, including the evolutions and achievements of this growing area of catalytic research. The impact of such techniques is discussed in terms of the invasiveness of physical probes on catalytic systems, as well as how experimentally obtained spatial profiles can be used in conjunction with kinetic modeling. Furthermore, some aims and aspirations for further evolution of spatially resolved techniques are considered.

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Section: Traditional Approaches To Catalyst Kinetic and Physical Char...mentioning

confidence: 99%

Evolution and Enabling Capabilities of Spatially Resolved Techniques for the Characterization of Heterogeneously Catalyzed Reactions

et al. 2016

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“…The Tauc plot was derived from the UV/Vis diffuse reflectance spectrum of a ZnMnO 3 /ZnO composite film (photodeposition time: 45 min) and highlights a linear region between 3.1 and 3.4 eV (Figure 5b ). The x‐intercept of a corresponding linear fit[ 34 , 35 ] yields a band gap E BG ~2.5 eV ( λ ~496 nm) in good accordance with the band gap of crystalline ZnMnO 3 nanosheets. In addition, a second contribution at lower energies i. e. at E >2.1 eV can be observed.…”

Section: Resultsmentioning

confidence: 67%

Conformal Coverage of ZnO Nanowire Arrays by ZnMnO₃: Room‐temperature Photodeposition from Aqueous Solution

2023

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Compositionally and structurally complex semiconductor oxide nanostructures gain importance in many energy‐related applications. Simple and robust synthesis routes ideally complying with the principles of modern green chemistry are therefore urgently needed. Here we report on the one‐step, room‐temperature synthesis of a crystalline–amorphous biphasic ternary metal oxide at the ZnO surface using aqueous precursor solutions. More specifically, conformal and porous ZnMnO3 shells are photodeposited from KMnO4 solution onto immobilized ZnO nanowires acting not only as the substrate but also as the Zn precursor. This water‐based, low temperature process yields ZnMnO3/ZnO composite electrodes featuring in 1 M Na2SO4 aqueous solution capacitance values of 80 – 160 F g‐1 (as referred to the total mass of the porous film i.e. the electroactive ZnMnO3 phase and the ZnO nanowire array). Our results highlight the suitability of photodeposition as a simple and green route towards complex functional materials.

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Optical Properties: UV/Vis Diffuse Reflectance Spectroscopy and Photoluminescence

Berger

Trunschke

2021

Metal Oxide Nanoparticles

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Electronic Spectroscopy: Ultra Violet‐Visible and near IR Spectroscopies

Cited by 10 publications

References 105 publications

Evolution and Enabling Capabilities of Spatially Resolved Techniques for the Characterization of Heterogeneously Catalyzed Reactions

Evolution and Enabling Capabilities of Spatially Resolved Techniques for the Characterization of Heterogeneously Catalyzed Reactions

Conformal Coverage of ZnO Nanowire Arrays by ZnMnO₃: Room‐temperature Photodeposition from Aqueous Solution

Optical Properties: UV/Vis Diffuse Reflectance Spectroscopy and Photoluminescence

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Electronic Spectroscopy: Ultra Violet‐Visible and near IR Spectroscopies

Cited by 10 publications

References 105 publications

Evolution and Enabling Capabilities of Spatially Resolved Techniques for the Characterization of Heterogeneously Catalyzed Reactions

Evolution and Enabling Capabilities of Spatially Resolved Techniques for the Characterization of Heterogeneously Catalyzed Reactions

Conformal Coverage of ZnO Nanowire Arrays by ZnMnO3: Room‐temperature Photodeposition from Aqueous Solution

Optical Properties: UV/Vis Diffuse Reflectance Spectroscopy and Photoluminescence

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Conformal Coverage of ZnO Nanowire Arrays by ZnMnO₃: Room‐temperature Photodeposition from Aqueous Solution