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Dive into the research topics where Anna Katharina Schuppert is active.

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Featured researches published by Anna Katharina Schuppert.


Angewandte Chemie | 2014

Confined-space alloying of nanoparticles for the synthesis of efficient PtNi fuel-cell catalysts

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

Stability of Fe‐N‐C Catalysts in Acidic Medium Studied by Operando Spectroscopy

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

Degradation of Fe/N/C catalysts upon high polarization in acid medium

Vincent Goellner; Claudio Baldizzone; Anna Katharina Schuppert; Moulay Tahar Sougrati; Karl Johann Jakob Mayrhofer; Frédéric Jaouen


ACS Catalysis | 2016

Minimizing Operando Demetallation of Fe-N-C Electrocatalysts in Acidic Medium

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

A Scanning Flow Cell System for Fully Automated Screening of Electrocatalyst Materials

Anna Katharina Schuppert; Angel Angelov Topalov; Ioannis Katsounaros; Sebastian O. Klemm; Karl Johann Jakob Mayrhofer


Journal of Electroanalytical Chemistry | 2012

Time and potential resolved dissolution analysis of rhodium using a microelectrochemical flow cell coupled to an ICP-MS

Sebastian O. Klemm; Arndt Karschin; Anna Katharina Schuppert; Angel Angelov Topalov; Andrea Maria Mingers; Ioannis Katsounaros; Karl Johann Jakob Mayrhofer


Catalysis Today | 2016

Probing active sites in iron-based catalysts for oxygen electro-reduction: A temperature-dependent 57Fe Mössbauer spectroscopy study

Moulay Tahar Sougrati; Vincent Goellner; Anna Katharina Schuppert; Lorenzo Stievano; Frédéric Jaouen


Electrochimica Acta | 2014

Potential-resolved dissolution of Pt–Cu: A thin-film material library study

Anna Katharina Schuppert; Alan Savan; Alfred Ludwig; Karl Johann Jakob Mayrhofer


ChemElectroChem | 2014

Composition-Dependent Oxygen Reduction Activity and Stability of Pt–Cu Thin Films

Anna Katharina Schuppert; Angel Angelov Topalov; Alan Savan; Alfred Ludwig; Karl Johann Jakob Mayrhofer


Angewandte Chemie | 2014

Legieren von Nanopartikeln im begrenzten Raum: Synthese eines aktiven und stabilen PtNi-Brennstoffzellenkatalysators

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

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Serhiy Cherevko

Forschungszentrum Jülich

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Alan Savan

Ruhr University Bochum

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