Anna Katharina Schuppert
Max Planck Society
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Anna Katharina Schuppert.
Angewandte Chemie | 2014
Claudio Baldizzone; Stefano Mezzavilla; Hudson W.P. Carvalho; Josef Christian Meier; Anna Katharina Schuppert; Marc Heggen; Carolina Galeano; Jan-Dierk Grunwaldt; Ferdi Schüth; Karl Johann Jakob Mayrhofer
The efficiency of polymer electrolyte membrane fuel cells is strongly depending on the electrocatalyst performance, that is, its activity and stability. We have designed a catalyst material that combines both, the high activity for the decisive cathodic oxygen reduction reaction associated with nanoscale Pt alloys, and the excellent durability of an advanced nanostructured support. Owing to the high specific activity and large active surface area, the catalyst shows extraordinary mass activity values of 1.0 A mgPt(-1). Moreover, the material retains its initial active surface area and intrinsic activity during an extended accelerated aging test within the typical operation range. This excellent performance is achieved by confined-space alloying of the nanoparticles in a controlled manner in the pores of the support.
Angewandte Chemie | 2015
Chang Hyuck Choi; Claudio Baldizzone; Jan-Philipp Grote; Anna Katharina Schuppert; Frédéric Jaouen; Karl Johann Jakob Mayrhofer
Fundamental understanding of non-precious metal catalysts for the oxygen reduction reaction (ORR) is the nub for the successful replacement of noble Pt in fuel cells and, therefore, of central importance for a technological breakthrough. Herein, the degradation mechanisms of a model high-performance Fe-N-C catalyst have been studied with online inductively coupled plasma mass spectrometry (ICP-MS) and differential electrochemical mass spectroscopy (DEMS) coupled to a modified scanning flow cell (SFC) system. We demonstrate that Fe leaching from iron particles occurs at low potential (<0.7 V) without a direct adverse effect on the ORR activity, while carbon oxidation occurs at high potential (>0.9 V) with a destruction of active sites such as FeNx Cy species. Operando techniques combined with identical location-scanning transmission electron spectroscopy (IL-STEM) identify that the latter mechanism leads to a major ORR activity decay, depending on the upper potential limit and electrolyte temperature. Stable operando potential windows and operational strategies are suggested for avoiding degradation of Fe-N-C catalysts in acidic medium.
Physical Chemistry Chemical Physics | 2014
Vincent Goellner; Claudio Baldizzone; Anna Katharina Schuppert; Moulay Tahar Sougrati; Karl Johann Jakob Mayrhofer; Frédéric Jaouen
ACS Catalysis | 2016
Chang Hyuck Choi; Claudio Baldizzone; George Polymeros; Enrico Pizzutilo; Olga Kasian; Anna Katharina Schuppert; Nastaran Ranjbar Sahraie; Moulay Tahar Sougrati; Karl Johann Jakob Mayrhofer; Frédéric Jaouen
Journal of The Electrochemical Society | 2012
Anna Katharina Schuppert; Angel Angelov Topalov; Ioannis Katsounaros; Sebastian O. Klemm; Karl Johann Jakob Mayrhofer
Journal of Electroanalytical Chemistry | 2012
Sebastian O. Klemm; Arndt Karschin; Anna Katharina Schuppert; Angel Angelov Topalov; Andrea Maria Mingers; Ioannis Katsounaros; Karl Johann Jakob Mayrhofer
Catalysis Today | 2016
Moulay Tahar Sougrati; Vincent Goellner; Anna Katharina Schuppert; Lorenzo Stievano; Frédéric Jaouen
Electrochimica Acta | 2014
Anna Katharina Schuppert; Alan Savan; Alfred Ludwig; Karl Johann Jakob Mayrhofer
ChemElectroChem | 2014
Anna Katharina Schuppert; Angel Angelov Topalov; Alan Savan; Alfred Ludwig; Karl Johann Jakob Mayrhofer
Angewandte Chemie | 2014
Claudio Baldizzone; Stefano Mezzavilla; Hudson W.P. Carvalho; Josef Christian Meier; Anna Katharina Schuppert; Marc Heggen; Carolina Galeano; Jan-Dierk Grunwaldt; Ferdi Schüth; Karl Johann Jakob Mayrhofer