Optimierung von unlegierten Elektrokatalysatoren für Brennstoffzellen: Eine theoretische und experimentelle Studie
Experimentelle Physik der kondensierten Materie
Zusammenfassung der Projektergebnisse
The project aim was to use recent experimental discoveries and a fundamental understanding of how one can increase the surface activity of pure Pt by at least the factor of 3.5-5 without any alloying to design active and more stable electrocatalysts for the oxygen reduction reaction. The key fact in this approach is that it is possible to increase the activity of, e.g., Pt by controlling the atom coordination near the ORR active sites. The particular aim was to elucidate and implement optimized structures with the maximum density of active sites of right coordination, improved stability, and local mass transport properties. Successful realization of the proposed project would not only clearly demonstrate the researchers and engineers how to improve the existing materials even without alloying; it would likely establish an entirely new methodology for the development of heterogeneous electrocatalysts based on a combination of theoretical calculations of different levels and experimental approaches which elaborate open nanostructured materials applicable in the “real-world” electrocatalysis.
Projektbezogene Publikationen (Auswahl)
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Optimizing the size of platinum nanoparticles for enhanced oxygen electro-reduction mass activity. Angewandte Chemie International Edition (2019) 9596-9600
B. Garlyyev, K. Kratzl, M. Rück, J. Michalička, J. Fichtner, J. Macak, T. Kratky, S. Günther, M. Cokoja, A.S. Bandarenka, A. Gagliardi, R. Fischer
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Revealing the nature of active sites in electrocatalysis. Chemical Science (2019) 8060-8075
B. Garlyyev, J. Fichtner, O. Piqué, O. Schneider, A.S. Bandarenka, F. Calle-Vallejo
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The nature of active centers catalyzing oxygen electro-reduction at platinum surfaces in alkaline media. Energy & Environmental Science (2019) 351-357
Y. Liang, D. Mclaughlin, C. Csoklich, O. Schneider, A.S. Bandarenka
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Advanced bifunctional oxygen reduction and evolution electrocatalyst derived from surface-mounted metal-organic frameworks. Angewandte Chemie International Edition (2020) 5837-5843
W.-J. Li, S. Xue, S. Watzele, S. Hou, J. Fichtner, A.L. Semrau, L. Zhou, A. Welle, A.S. Bandarenka, R.A. Fischer
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Electrochemical top-down synthesis of C-supported Pt nanoparticles with controllable shape and size: mechanistic insights and application. Nano Research (2020)
B. Garlyyev, S. Watzele, J. Fichtner, J. Michalička, A. Schökel, A. Senyshyn, A. Perego, D. Pan, H. El-Sayed, J.M. Macak, P. Atanassov, I.V. Zenyuk, A.S. Bandarenka
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Enhancing the hydrogen evolution reaction activity of platinum electrodes in alkaline media using Ni-Fe clusters. Angewandte Chemie International Edition (2020) 10934-10938
S. Xue, R.W. Haid, R.M. Kluge, X. Ding, B. Garlyyev, J. Fichtner, S. Watzele, S. Hou, A.S. Bandarenka
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In-situ quantification of the local electrocatalytic activity via electrochemical scanning tunneling microscopy. Small Methods (2020) 2000710
R.W. Haid, R.M. Kluge, Y. Liang, A.S. Bandarenka
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Tailoring the oxygen reduction activity of Pt nanoparticles through surface defects: a simple top-down approach. ACS Catalysis (2020) 3131-3142
J. Fichtner, S. Watzele, B. Garlyyev, R. Kluge, F. Haimerl, H. El-Sayed, W.-J. Li, F. Maillard, L. Dubau, R. Chattot, J. Michalicka, J. Macak, W. Wang, D. Wang, T. Gigl, C. Hugenschmidt, A.S. Bandarenka
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Temperature effects in polymer electrolyte membrane fuel cells. ChemElectroChem (2020) 3545-3568
T. Lochner, R.M. Kluge, J. Fichtner, H.A. El-Sayed, B. Garlyyev, A.S. Bandarenka
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In-situ detection of active sites for carbon-based bifunctional oxygen reduction and evolution catalysis. Electrochimica Acta (2021) 138285
R.W. Haid, R.M. Klug, T.O. Schmidt, A.S. Bandarenka
