FisMat2017 - Submission - View

Abstract's title: In-situ ptychography of dynamic processes: recent experiments and computational issues
Submitting author: Georgios Kourousias
Affiliation: Elettra Sincrotrone Trieste
Affiliation Address: s.s. 14 km 163.5 in Area Science Park, 34149 Basovizza, Trieste
Country: Italy
Oral presentation/Poster (Author's request): Poster
Other authors and affiliations: Benedetto Bozzini b, Alessandra Gianoncelli a, Grant Van Riessen c, Michael Jones c,d, Maya Kiskinova a a Elettra-Sincrotrone Trieste, Trieste, Italy b Salento University, Lecce, Italy c La Trobe University, Melbourne, Australia d Australian Synhcrotron, Clayton, Melbourne, Australia

The presentation reports on novel Soft X-ray Fresnel CDI ptychography results, demonstrating the potential of this method for dynamic studies. Our in-situ ptychography experiments explored the electrodeposition process of Mn and Co/polypyrrole (PPy) nanocomposites, Pt-free candidates for fuel cell catalysts [1]. The measurements were performed using a custom-made three-electrode microcell [2]. The cell has been developed at the TwinMic beamline of Elettra during a series of experiments that were continued at the SXRI beamline of the Australian Synchrotron [1]. The ptychography-based investigation of the electrodeposition dynamics was executed during the in-situ electrical biasing of the electrochemical cell. Besides the observation of morphological changes, we retrieved the spectroscopic information, provided by multiple ptychographic energy scans across Mn and Co edges. The most important issues related to the computational aspects of such experiments will be outlined and potential improvements of the methodology will also be discussed.

[1]        G. Kourousias, B. Bozzini, A. Gianoncelli, M. W. M. Jones, M. Junker, G. Van Riessen, M. Kiskinova.Shedding light on electrodeposition dynamics tracked in situ via soft X-ray coherent diffraction imaging, Nano Research, Vol. 9 - 7, pp. 2046-2056 (2016)

[2]        B. Bozzini, A. Gianoncelli, P. Bocchetta, S. Dal Zilio, G. Kourousias. Fabrication of a Sealed Electrochemical Microcell for in Situ Soft X-ray Microspectroscopy and Testing with in Situ Co-Polypyrrole Composite Electrodeposition for Pt-Free Oxygen Electrocatalysis, Analytical Chemistry, Vol. 86 - 1, pp. 664-670 (2013)