PMID- 26314711
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20160126
LR  - 20151015
IS  - 1521-3773 (Electronic)
IS  - 1433-7851 (Linking)
VI  - 54
IP  - 43
DP  - 2015 Oct 19
TI  - Stability of Fe-N-C Catalysts in Acidic Medium Studied by Operando Spectroscopy.
PG  - 12753-7
LID - 10.1002/anie.201504903 [doi]
AB  - 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.
CI  - (c) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
FAU - Choi, Chang Hyuck
AU  - Choi CH
AD  - Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut 
      fur Eisenforschung GmbH, Max-Planck-Strasse 1, 40237 Dusseldorf (Germany). 
      c.h.choi@mpie.de.
FAU - Baldizzone, Claudio
AU  - Baldizzone C
AD  - Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut 
      fur Eisenforschung GmbH, Max-Planck-Strasse 1, 40237 Dusseldorf (Germany).
FAU - Grote, Jan-Philipp
AU  - Grote JP
AD  - Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut 
      fur Eisenforschung GmbH, Max-Planck-Strasse 1, 40237 Dusseldorf (Germany).
FAU - Schuppert, Anna K
AU  - Schuppert AK
AD  - Universite de Montpellier, Institut Charles Gerhardt Montpellier, 2 place Eugene 
      Bataillon, 34095, Montpellier (France).
FAU - Jaouen, Frederic
AU  - Jaouen F
AD  - Universite de Montpellier, Institut Charles Gerhardt Montpellier, 2 place Eugene 
      Bataillon, 34095, Montpellier (France). frederic.jaouen@univ-montp2.fr.
FAU - Mayrhofer, Karl J J
AU  - Mayrhofer KJ
AD  - Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut 
      fur Eisenforschung GmbH, Max-Planck-Strasse 1, 40237 Dusseldorf (Germany). 
      mayrhofer@mpie.de.
LA  - eng
PT  - Journal Article
DEP - 20150828
PL  - Germany
TA  - Angew Chem Int Ed Engl
JT  - Angewandte Chemie (International ed. in English)
JID - 0370543
OTO - NOTNLM
OT  - corrosion
OT  - degradation mechanisms
OT  - demetalation
OT  - electrochemistry
OT  - fuel cells
EDAT- 2015/09/01 06:00
MHDA- 2015/09/01 06:01
CRDT- 2015/08/29 06:00
PHST- 2015/05/29 00:00 [received]
PHST- 2015/07/23 00:00 [revised]
PHST- 2015/08/29 06:00 [entrez]
PHST- 2015/09/01 06:00 [pubmed]
PHST- 2015/09/01 06:01 [medline]
AID - 10.1002/anie.201504903 [doi]
PST - ppublish
SO  - Angew Chem Int Ed Engl. 2015 Oct 19;54(43):12753-7. doi: 10.1002/anie.201504903. 
      Epub 2015 Aug 28.