ChemInform Abstract: Soft X‐Ray Imaging and Spectromicroscopy: New Insights in Chemical State and Morphology of the Key Components in Operating Fuel‐Cells

Bozzini, Benedetto; Abyaneh, Majid Kazemian; Matteo, Amati; Gianoncelli, Alessandra; Gregoratti, Luca; Kaulich, Burkhard; Кискинова, М.

doi:10.1002/chin.201249275

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“…In situ surface analysis is imperative to gaining a deeper understanding of the mechanisms of coking resistance. Compared to post-mortem analyses, the characterizations under operating conditions could uncover rich information about the dynamic interactions between the gas species, surface functional groups, and electrode materials of SOFC systems, as demonstrated in the recent studies using in situ neutron scattering, environmental scanning probe microscopy, atmospheric X-ray photoelectron spectroscopy (XPS), and synchrotron-based X-ray adsorption spectroscopy (XAS). , In particular, Raman spectroscopy is sensitive to both crystalline and amorphous phases of electrode materials as well as reaction intermediates on electrode surfaces, providing a unique advantage in studying electrode surfaces under in situ and operando conditions. − Surface enhanced Raman spectroscopy (SERS) can significantly enhance the surface specificity and sensitivity to species present in trace amounts. , Recently, the utility of SERS for probing SOFC electrode materials in realistic chemical environments at high temperatures has been demonstrated. , Through carefully devised in situ Raman and SERS analysis, the coking resistance mechanisms of different catalysts and their regeneration behavior can be probed, to provide guidance for knowledge-based design of SOFC electrode materials.…”

Section: Introductionmentioning

confidence: 99%

In Situ Probing of the Mechanisms of Coking Resistance on Catalyst-Modified Anodes for Solid Oxide Fuel Cells

Liu

Lai

et al. 2015

Chem. Mater.

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Coking is a major cause of performance degradation of Ni-based anodes in solid oxide fuel cells (SOFCs) powered by carbon-containing fuels. While modification of Ni surfaces using a thin coating of BaO, BaZr 0.9 Y 0.1 O 3−d (BZY), and BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3−d (BZCYYb) was reported to alleviate the problem, the mechanism is yet to be understood. In this study, in situ Raman spectroscopy and surface enhanced Raman spectroscopy (SERS) are used to probe the surface chemistry of BaO, BZY, and BZCYYb. Analyses of the time-resolved spectral features of C−C bonds, −OH groups, and −CO 3 groups reveal the interactions between surface functional groups and gas species (hydrocarbon, water steam, and CO 2 ). While the switching from −OH to −CO 3 groups is irreversible on BaO surfaces, it becomes reversible on both BZY and BZCYYb surfaces. Although the −OH mediated carbon removal is observed on the surfaces of all three catalysts, the −CO 3 is found effective for carbon removal only on the BZCYYb surface.

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