The Coherent X-ray Sub-micro and Nanoprobe Stations for the CARNAUBA Beamline at the Sirius-LNLS Storage Ring.

Pérez, Carlos A.; Tolentino, H.; Soares, Márcio M.; Dias, Carlos Sato Baraldi; Galante, Douglas; Teixeira, Verônica C.; Abdala, Dalton Belchior; Westfahl, Harry

doi:10.1017/s143192761801396x

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“…Carnaúba is an X-ray nanoprobe beamline dedicated to multianalytical analysis and imaging, working in an energy range from 2.05 to 15 keV, where the sample can be raster-scanned, providing access to bidimensional maps or tomographic analysis. The main available techniques are X-ray absorption spectroscopy (XAS), X-ray fluorescence (XRF), X-ray excited optical luminescence, X-ray diffraction (XRD), ptychography, and Bragg coherent diffraction imaging (BCDI) with nanometric spatial resolution. More specific in-depth technical information about the beamline and the available techniques can be found in the Supporting Information and in the literature .…”

Section: Introductionmentioning

confidence: 99%

Development of Electrochemical Cells and Their Application for Spatially Resolved Analysis Using a Multitechnique Approach: From Conventional Experiments to X-Ray Nanoprobe Beamlines

Vicente,

Raju,

Gomes

et al. 2023

Anal. Chem.

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Real (electro)catalysts are often heterogeneous, and their activity and selectivity depend on the properties of specific active sites. Therefore, unveiling the so-called structure−activity relationship is essential for a rational search for better materials and, consequently, for the development of the field of (electro-)catalysis. Thus, spatially resolved techniques are powerful tools as they allow us to characterize and/or measure the activity and selectivity of different regions of heterogeneous catalysts. To take full advantage of that, we have developed spectroelectrochemical cells to perform spatially resolved analysis using X-ray nanoprobe synchrotron beamlines and conventional pieces of equipment. Here, we describe the techniques available at the Carnauba beamline at the Sirius-LNLS storage ring, and then we show how our cells enable obtaining X-ray (XRF, XRD, XAS, etc.) and vibrational spectroscopy (FTIR and Raman) contrast images. Through some proof-of-concept experiments, we demonstrate how using a multi-technique approach could render a complete and detailed analysis of an (electro)catalyst overall performance.

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Section: Introductionmentioning

confidence: 99%