4.8 Article

Investigation of CoS2-based thin films as model catalysts for the oxygen reduction reaction

Journal

JOURNAL OF CATALYSIS
Volume 258, Issue 1, Pages 235-242

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2008.06.016

Keywords

transition metal sulfide; CoS2; proton exchange membrane fuel cell; oxygen reduction reaction; dynamic polarization; X-ray diffraction; micro-Raman spectroscopy; atomic force microscopy; X-ray photoelectron spectroscopy; scanning Auger microscopy; magnetron sputtering

Funding

  1. Ballard Power Systems
  2. United States Department of Energy [DE-FC36-03G013107]
  3. Natural Sciences and Engineering Research Council of Canada

Ask authors/readers for more resources

Three CoS2-, NiS2- and (Co,Ni)S-2-based thin films were prepared by magnetron sputtering and studied as catalysts for the oxygen reduction reaction (ORR). Electrochemical assessments indicate that all three films have significant ORR catalytic activities, with that of (Co,Ni)S-2-type show ng the best performance with regard to both open circuit potential (OCP) and current density. The ternary film has an OCP value of 0.89 V vs. the reversible hydrogen electrode. and shows a closer approach to values for Pt than have been obtained to date for other transition metal chalcogenides. The thin films assessed by electrochemistry have been characterized by a range of techniques including high-resolution X-ray diffraction, micro-Raman spectroscopy, atomic force microscopy, X-ray photoelectron spectroscopy and scanning Auger microscopy. The CoS2-based film has a wrinkled surface, which appears relatively unchanged after an electrochemical durability test. while the NiS2-like film preferentially loses Ni and the (Co Ni)S-2-like, film (based on nanoparticles with approximate composition Co0.6Ni0.4S2) undergoes a phase separation. (spinodal decomposition). All these films show an excess of S in the as-prepared form and after electrochemistry; evidence is presented for the possible presence of some polysulfides. (c) 2008 Elsevier Inc. All rights reserved.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.8
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available